LabVIEW - Science topic

If you have a program for one spectrum analyzer with a graph output, then you should repeat it three times. For example, one under the other. And make three control panels, each with its own controls and its own graphs. But if you want to combine controls and graphs, then you need to work with combining and separating elements into units (structures).

Also, you need to see your device and its driver recognized in NI-MAX, and from what you posted it doesn't seem to be the case

Dmitry Yakovlev,

As I mentioned before, I have this manual. However, I can’t make it work in LabView.

You are quite persistent. With the OneLight Spectra, the narrowest spectrum with a peak that I can produce is about 20 nm wide. That's actually already too wide, but I can push this spectrum to almost 1 nm exactly where I need it. So I can pretty much create a spectrum the way I want it without having to rely on the emission curve of individual light sources.

This issue you raise "Having a spectrum ranging from 510 nm to 555 nm, with all the intermediate frequencies, wouldn't produce the same effect as having a spectrum with two peaks at 510 nm and 555 nm?" is part of the problem I want to investigate.

Unfortunately, the light source you offer really doesn't help me. I am really looking for the "source code" for my old OneLight Spectra, or a device that can really do exactly the same as my old device. However, in terms of sustainability, it is annoying to replace a functioning device with a new one only just because you can't get the software.

Thank You again for Your Tip,

Christian Greim

Hello Hiba,

Yes there are many online resources to learn LabVIEW. I prefer National Instrumemts' courses.

The courses cover: the basics and advance level of LabVIEW and include tutorials, quizzes, excersises, and certification.

Best regards

Hiba Muneer Yahya ,

You can refer the following:

Does it show up in NI-MAX under Devices and Interfaces?

Can you export it to LabVIEW v21? The option is in File->Save as previous version...

You probably need to check the Pressure Scanners Information to decide on which scanner to buy. The following link provides such information:

Hello, please let me know if you figured out how to set the sampling rate by Linx.

Hi,

I suggest you see the links on the topic.

Best regards

Now it's cost is 1710 pounds. Enjoy!

Many thanks for this I will pass this on to see what is found. Of course you are right to go back to fundamentals. Phd students in the past have had this working hence why i didn’t think/want to go back to fundamentals. That said, makes sense to go piecewise and work out what is and is not working.

i haven’t used Labview for a long time but I remember it to

be a lot of fun and games!

i’ll keep you updated.

best regards

james

I have utilized NI 9211 Temperature data acquisition card and k-type thermocouple for in-situ temperature measurement. Also, you can use Arduino-based temperature measurement sensors (calibrated).

Refer to the following article for more details:

Use the analog input channels in differential mode.

Can any one share LabVIEW VIs for fractional order systems?

Emir Öncü Have a look http://www.diva-portal.org/smash/get/diva2:829934/FULLTEXT01.pdf

Hi. Install telegram and go to group with below link... you can ask your question from mr.fooladi (number one in programming with labview)

Dear Subham Paramanik,

I suggest you see links on the topic.

Best regards

Dear Mandar Ingale

Apparently yes, you need a required manual for this.

Kind Regards

You can design and analyze by LabVIEW.

you can use R language and Python

regards

Hi Amashisha David

Yes. The LabVIEW simulation tool can provide it.

The following paper may help you: "MOTOR CURRENT SIGNATURE ANALYSIS BASED FAULT DIAGNOSIS OF INDUCTION MOTOR" http://ijcns.com/pdf/ijpcscvol6no2-1.pdf

Dear Daniel Borowiak ,

I think this fault is associated with computer display itself. If it is caused by the display it self if you move the plot to the right of the left away from this area of the screen you may get correct raster.

Best wishes

I don't really know about MATLab, but if you want to be able to change from labview to a scientific language, you can look to python.

First, in order to help you, one has to know what are the components of your system, brand or drivers.

Second, it is absolutly unclear what is limiting your set-up. Is your actuator limited ?

We've made some electronics components to drive synthetic muscle, we drive it with raspberry using python without any issue. I don't really understand on what kind of muscle you want to work with servomotors.

Do you want to strain the mouse muscle with mechanical actuator or do you want to use electric stimulation and measure the force and length variation ?

Sometime it cost less to buy new sensors and actuators that are compatible with your language than trying to redevelop the solution using existing rig.

We have developed Crappy for all this kind of work, it is not MATLab but python, but it surely allows to do what your looking for.

Feel free to post an answer if you are interested.

Regards,

Nur Anida Jumadi How to deconvolute a peak / multiple peaks fitting in origin

Deconvolution of a composite peak into its individual peaks plays an important role in the interpretation of many types of graphs including XRD, XPS, FTIR, and PL etc. In this video, I have discussed how to deconvolute simple combined peaks, composite peaks and how to correct missing data in a given peak with the help of deconvolution. In the case you want to further ask about it, please do comment on the specific video, I'll respond to it shortly. I have provided the practice files (OriginLab) here. Thanks

Thank you Kengo Shibuya and P. K. Dubey

I was able to find a LabVIEW program (sr830.vi) on the ni website based on the SR830. Since I am only able to get in the lab on Tuesdays and Thursdays at the moment I have been unable to successfully test this program out. Thank you for the insight on the cables as I have been struggling to find the right connection method, but I know that their is a 9 pin to 9 pin cable that I can use.

I was wondering if you have worked with the sr830.vi before, and if so was there any changes that needed to be made based on the progran itself to receive proper data?

Please watch this video:

LabVIEW | Stepper Motor Control using Arduino | Auto & Manual | Arduino + LabVIEW Projects Series

https://www.youtube.com/watch?v=WpOttQLEwUA

Hello Natheer, I have the same problem as you. Did you interface the Max6675 SPI with arduino to Labview, using Linx?

If you did it, can you share your vi?

I found another solution, using the Serial Interface of Labview, but it does not look very performing and reliable. You can check the following link:

And https://link.springer.com/content/pdf/10.1007/s10994-006-6889-7.pdf

Although without drivers it becomes very difficult to interface with the instrument.

Recently I also came acros such situation, where I followed the communication protocol (specific commands for directly accessing it registers;their addressing etc) provided by the vendour.

I think, you can also focus on implementing the possible communicating commands for the device you are trying to interface.

Hi G.Hari Krishnan,

I don't have the ZENNIUM workstation, and I actually verified with technical support and they told me that is it not possible to control the Potentiostat without having the ZENNIUM workstation...

Dear Kadir Ejderha ,

In order to increase the number of scanning points you can repeat the command of the scan with giving an the initial point of the second scan = final scanning point from the previous scan +1.

To get single point scan make Ni= 1, Nfinal=1 Nstep=0,

Ni is the initial point of the scan, Nfinal is final point index and Nstep is eqaul zero.

This is a proposal from me than may be applicable or not. The exact solution can be found by consulting the manual of measuring instrument and its modes of operation.

Best wishes

I also did force analysis by using single-axis force sensor or load cell at different speeds and acceleration excitation of the actuator. As dr. Dubey said that you have checked the load cell amplifier module and set the output value according to your designated value. I et on 5V. Then you should used DAQ (data acquisition card) to show force sensor values in the sinusoidal form and actuate the piezo by the instructed value set in your LabView.

Also, check the attached file on the topic

Dear Shabana Urooj

Methodology used in ECG data of these studies may guide you which method to use depending on your budget, availability, and requirements:

1.

2.

3.

4.

It is assumed that your detector signal will be in form of a DC voltage if your radiation is kept unchanged. This signal is contaminated by the noise of the detector.

So, If the noise is correlated one can eliminate the noise by subtracting the off signal from the adjacent on signal. To achieve correlation one may make the off time short and the on time of an equal interval.

I would like to propose that you reduce the chopper time and see how instruments reach to steady sate.

On the other side too short time may not allow the detector and the electronics to reach their steady sate conditions.

If you van acquire the waveform pf your signal, then you can analyze it by FTT to determine it frequency content.

The DC value must be the targeted detector reading.

If the steady sate value is drifting It may be due to the slowly time variation in the signal.

Best wishes

This will take some time to digest. Thank you for your help.

I absolutely agree with the suggestion of Nikolay Pavlov for the low cost and also relatively simple to program. It depends on your requirements such as sample rate, resolution refresh rate for DAC and others. If the cost is the ultimate limitation. I would also suggest to use a general purpose 8 bit controller and use the 10bit ADC. If it is not sufficient use the separate module available such as below link. Similar D/A modules are also available. Developing own customised board would be the additional task which can be minimised in case of Arduino board as most of the codes are freely available online.

I have interfaced through GPIB and communication established. I don't have the knowledge to write LabVIEW programme for 2401. I am asking working programs.

If you have any data acquisition card for LabVIEW then it must have this function to change baseline. Other simple option is to have an OpAmp as adder and use programmable potentiometer (like X9C103S) to change the dc reference to one of the input terminal of adder. Change the potentiometer input from a simple microcontroller or computer directly.

Hi

Please check the following work. It describes the process in details. I believe it will help you.

https://www.researchgate.net/publication/222357024_Hybrid_MATLAB_and_LabVIEW_with_neural_network_to_implement_a_SCADA_system_of_AC_servo_motor

Regards

You can see these useful links

You could use Arduino + Raspberry Pi to emulate a radar system with a few inexpensive sensors. I wrote a whole tutorial on it. Radar is great because most students understand the use, but not the specifics of how it works. Some learnings include: polar plots, servo motor control, and time-of-flight measurements. I am not using radio waves, instead I'm using an ultrasonic sensor, which makes the problem more approachable and creates another layer of physics to understand (acoustics).

Here's a link to the tutorial:

I've also attached an image of the hardware and software together.

Thank you Umair Yaqub and Mohamed-Mourad Lafifi for helpfull respenses

Julio Cesar Bastos Fernandes, thank you very much for the information. Had the same trouble. After more than two years this information found me and helped "somebody" :) I love researchgate and I agree with you that this is an awesome software for education, I will use it in my course. By the way I am sorry to see today during my search on the company's site that south korea increased the covid-19 allert to red code and says staff to stay at home for 1 week. Wish to hear good news.

Thank you all for your suggestions.

The error code is related to the VI KE6221 -- Set Wave Amplitude. The current is sent as fractional number, every current below 1uA is interpreted as 0, giving the Error 222 - Out of Range. I've changed the format to scientific, now the 6221 sine wave is working as expected.

PS: The set wave offset value has the same issue.

You can follow two standards for human exposure to vibration.

ISO - 8041, which is related to the measurment tool (Specifications for the sensors). It will help you to check if your accelerometer is ok for measure HAV ranges.

ISO - 5349, wich is related to the evaluation of HAV and give you all the information to perform your measure (how to put the sensor, which weighting filter to apply...).

I have downloaded and installed the driver for lakeshore 425 gaussmeter. The gaussmeter utilizes "traditional" LabVIEW blocks to be configured and to measure. Thus, I believe the task you solve does not significantly differ from the task solved at the discussion I mentioned above. The main idea, as I suppose, to synchronize both measurements

Iulia Puscas, you can use open and read from a text file using the Open/Create/Replace file and Read From Text File VIs. From there you need to convert the string that is output from the Read Text File to and array by using the Spreadsheet string to Array function. Note that your data is space delimited rather than tab delimited, so you need to wire in a space constant.

I've attached a VI that will do this. Let me know if I need to save it for an older version of LabVIEW.

Dear Subham,

I suggest you to see links and attached files on subject.

Best regards

Syed Mohammad Ashab Uddin

A common problem.

<nods>

You have a loop, and inside the loop you poll the hardware and obtain an analogue value. In that loop I would have another counter, called TICK. It increments by one every time you get a signal, unless that counter is equal to WINDOW.

(WINDOW is an integer, set by the user: it's the 'window' over which the code turns edges into values).

So you have an conditional statement that increments TICK if TICK<WINDOW.

Otherwise, TICK is set to 0.

Okay? So, if WINDOW = 5, TICK will be 0, 1, 2, 3, 4, 0, 1, 2, etc.

The next step is deciding whether the value is close to the last value you read - if it isn't (and you might want to test for rising or falling edges) then you've found an edge, and you should increase a 'number_of_edges' counter by one.

I would then add another case added to the TICK=WINDOW case.

If TICK=WINDOW then analogue_value = (number_of_edges / WINDOW)*some scaling factor

Oh, and add another case to the TICK=WINDOW case, to reset number_of_edges to 0.

:)

(nearly forgot!)

Of course, there might well be a module that does all this these days. But this is a low-level implementation - and isn't very slick, but should work.

<I've a code that does this at home in LabVIEW 8.2 if you're really stuck>

Dear Muhammad,

welcome,

You want to express the experimental data as apiece wise function of time and then transform these functions in the frequency domain using Fourier analysis.

Piece wise means that you want to divide your curve into pieces covering certain ranges of time.

Well! i would propose at first if your experimental results are periodic or not. If they are periodic what is the value of the periodic time.

If they are periodic you can take only one period of time and making for them fft analysis. If the function is periodic means that the frequency components will be a fundamental and harmonics.

I think in order to demonstrate the periodicity you have to have results a relatively long times containing many cycles.

When you show extended results in time i can tell you how to divide your curve into pieces.

Best wishes

Have you considered using machine learning?

What you could try is to use an unsupervised clustering algorithm with two classes, one for noise and the other for your desired signal. If the desired signal is significantly more than the noise then you can consider performing anomaly detection but you will need training data.

The features you will need to extract will depend on what type of audio you are dealing with. If you are working with speech, then MFCCs might be a good place to start.

Domain knowledge will play a big role in solving your problem so, telling us the type of audio signal you are dealing with could help narrow down the problem.

Dear Muhammet,

I agree with the previous answers this can be done easily in software.

If you need a hand please contact me I have a LabVIEW example that explains it very well.

Good Luck

Michele

Dear Raja,

Its very simple to try this using Arduino, you can use the analogue input to specify the acceleration.

Warm regards

Dear. Hyderiqbal Sheikmohamed ! To begin with, I want to note that the level and spectrum of noise depends on the design and electrical properties, as well as the operating conditions of the machine. If all the indicators and operating conditions are ideal, then we can say, as the noise. However, in reality, noise has a wide spectrum, primarily, as you noted, with frequencies that are multiples of the operating frequency.

Best regards, Islam.

Read these two papers who invented backpropagation.

Geoffrey hinton - https://www.cs.toronto.edu/~hinton/absps/plautfilters.pdf

Yann lecunn - http://yann.lecun.com/exdb/publis/pdf/lecun-88.pdf

Your question could be interpreted two ways, which result in two implementations of the data acquisition. Both require a pressure sensor for your pressure and rotary encoder for your angle. There are many types of both of these, so you should pick the ones which work best for you based on performance and cost (and if you already have them). The two interpretations are:

Please note that you can use either system to get data for either interpretation, but data analysis will be a little more complex. National Instruments offers a huge variety of data acquisition systems which can do this measurement, provided your sensors can be connected to them. If you are buying equipment, make sure your pressure sensor and rotary encoder work with the data acquisition boards you purchase. Also note that one of the papers listed by Mohamed-Mourad Lafifi above is "old" and may use obsolete equipment. The measurement theory and techniques do not change, but NI puts out new equipment very often. You can probably do it better/faster/cheaper with newer equipment, if you are purchasing equipment. This is a fairly simple measurement, so any reliable, working data acquisition boards which meet your specs would do it. Don't buy anything if you don't have to. You could do this measurement with BiRa boards in a CAMAC crate with a PDP11/23 controller, if you happened to have one around and knew how to use it.

Finally, I would highly recommend you post your question to the NI discussion forums. I usually get good replies within 24hrs. The NI website also has multiple examples that should help with simultaneous data acquisition, pressure sensing, reading rotary encoders, and triggering from both analog and digital signals.

Disclosure: I was once a National Instruments employee.

hello..you can use the cropping instruction in matlab language to crop the numbers from the image then do anything on the image like zoom_in , zoom_out or display it . the first way to cropping by giving the location and the second way by cross the x-axis and y-axis.

Go for Yourduino rather than Arduino. The coding interface is same but Yourduino is 10 times powerful than typical Arduino

I just uploaded matlab code for reconstruction off-axis hologram, also available on matlab file exchange server.

I would second (third?) the use of the event structure. You may find that controlling the car using only arrow keys is somewhat difficult. This can probably be made easier by making the motors return the car wheels to zero rotation (slowly or quickly, as you wish) if you are not pushing the arrow keys. The event structure has a timeout function (frame) which makes this fairly easy to implement. Good luck. Sounds like fun.

Here is a good example

Dearv Shakil,

Yes we can use Gabor transform/filter for denoising vibration signal, I suggest you to see links relative on subject.

-Noise reduction method for vibration signals 2D ... - Wiley Online Library

-A statistical filtering method for denoising of micro-force measurements

-Optimal Estimation of States in Quantum Image Processing - arXiv

Best regards

Good question.. Please share me the best answer might you trust...

Regards…

Abdelhalim abdelnaby Zekry I just want to confirm you saw my reply. I am learning ResearchGate so forgive my not tagging you in my reply.

It is intermittent flight, thank you, Mr Amin

Dear Sanjay. I tried to find the tribalengineering ICTL toolkit, but it seems that no link works. How can I get it?

Most Labview VIs (functions) that allow you to save data have a 'file path' input variable (eg. for saving data to a spreadsheet see https://zone.ni.com/reference/en-XX/help/371361J-01/glang/write_to_spreadsheet_file/ ). This is the name and location of the folder where Labview will save the data to (when it is left blank the user selects where to save the data). If the file that you are saving the data to doesn't exist, Labview will typically create the file first, and so would probably do the same thing for folders and file paths that don't exist. So if you create a string constant which is the location of where you want to save the file and make this constant an input to any save data VIs, Labview will automatically save the data in this location without prompting the user.

Then all you need to do is automatically create a new folder path for every loop iteration. If you wanted to call each folder after a different number(such as "folder1", "folder 2", "folder 3") then you need to first define the beginning of the folder name (in this example "folder") as a string constant. Then you convert the iteration number (1,2,3 etc) from an int to a string and combine your number string and your string constant using the Concatenate string function (http://zone.ni.com/reference/en-XX/help/371361P-01/glang/concatenate_strings/). You can then used this concatenated string as the file path input for your VI to save the data and it should save the data to a different file for every loop iteration.

Thanks Bruno,

It is clear. Unfortunately, I cannot advice on the camera. My experience, however, shows that it is easier to spend 10$ (even out of my own pocket) that spend 1 month figuring out a problem of the kind - a very particular problem with minor overall consequences.

An alternative (brute-force - be careful!) solution is either physically prevent focus change (stick tape around the lens) or remove the case and remove a wire froma focusing mechanism. It may be faster than dealing with programming matters.

A lesse-brute-force solution is to help the camera to focus nicely - add a lot of light, draw a red cross in the centre to aid focusing.

I’m using Labview 2016 and VI. Thank you for your help in advanc!

Direct sampling of RF signal requires a notch filter at front-end to reject signal in other bands, otherwise all unwanted signals will also get sampled.

2GS/s is more than enough for working on L5.

The advantage of Direct sampling is that you do not need down conversion, but the requirement of notch filter is too stringent that it is impossible to be realized.

Interesting...

Dear Tianren,

IThere will also be a full list of serial commands you can use to can only speak for the DMA, as I'm not very familiar with the CPMA. The Model 3081 is actually only the "naked" DMA column, which cannot really be controlled through LabView alone. But I'm guessing that you are actually operaing this DMA on one of TSI's Electrostatic Classifier platforms. If so, you'll need to identify what the model is. Most likely it will be a 3080 platform if you bought it before July 2013 or a Model 3082 if it is a more recent purchase (identifiable by the colour display). Then look at the corresponding Electrostatic Classifier operational manual from TSI. In my version Appendix C details how to communicate with the Classifier through a terminal emulation program.