Optical Sensing - Science topic

The HSAB principle also plays a crucial role here. Cr3+ being a hard acid tends to bind stronger to the hard centers in the schiff base ligand due to hard-hard interaction.

Moreover, the cavity size produced by the ligand for the host-guest interactions is ideal for Cr3+ ion to strongly bind with the ligand. For other ions, the cavity size may not be suitable for the interaction to take place as that of Cr3+.

The OLS is a short cut to the ML solution. It can be derived directly from the assumption that Y|X ~ N(µ(X), s²), but the solution is correct for any distribution model: justlike the ML estimate, the OLS estimate estimates the expected value (of the parameter) and this is independent of the assumed distribution model ("under some mild regularity conditions", eg. as long as it has a finite expectation and variance).

The difference, therefore, is not in the predicted value, but rather in the uncertainty attributed to this prediction. Depending on the research context, this uncertainty may or may not be relevant. If it is not relevant, then there is no need invest much mental work in figuring out a "most correct" or "least wrong" distribution model.

When models are really used for prediction, the "model inherent" uncertainty (that is determined by the chosen distribution model) associated with a prediction is usually not relevant. What is of much greater relevance and impact here is the differences in predictions between possible alternative models. This is particularily relevant when the predictions are forecasts. Provided there is sufficient data, this pleiotropy of possible alternative models can be adressed by heavily over-parametrized models where the impact of the assumed distributional model approaches zero (such models are nowadays called "deep-learning" models, neural networks, AI etc,). This is then very much on the side of getting most correct predictions at the cost of gaining the least amount of insight. But it works to get predictions with good or acceptable positive and negative predictive values.

The absorption coefficient of a material showing RSA will increase when the input optical fluence is increased. However, the processes underlying RSA (mostly excited state absorption in organic molecules) do not result in the absorption of more light than what is fed into it. Therefore, the scenario you envisage will not happen.

Aparna Sathya Murthy thank you so much, madam.

Yes Pol, your kinetic analysis will be needed again. We have now temporally resolved much higher frequency of the data (every 10 minutes - maybe more data than we need), which are provided via mobile app to each lab.

Prof. Mukherjee Sir, The attenuation coefficient /mm is ~1.96 for alumina based  thin OSL discs. Its possible to make OSL discs in large scale within +-5% sensitivity; batch production. 

I recommend to read the reviews of this problem

I'm not using a camera to record the interference pattern, but i am just doing a simulation on optisystem, then i collect both the Input power and output pour to unwrap the phase, to get the value of the distance, This is my supervisor's request: "What you should focus on is the stochastic effects such as noises in the comb generation process and other places on the ranging accuracy". But i'm not specialized in this field so i couldn't get his meaning. can you give me so hints

Thanks  

Dear Vishal, I understand now. I would try to work with flow through cuvette/cell. They are cheap and can find them with many different shapes and sizes. Maybe you can find one that is like a box with a lid. You could just use the "box" with the lid and cover the waveguide with it. If you don't find, there is always the way to open a normal cell, but you will need some specific facilities to do it (people who know glass milling or work with femto lasers).

To keep hermetic you can glue it to the wafer or the part that holds the waveguide. Torr Seal is a very effective glue for gas and vacuum applications and can be found through Thorlabs. Maybe a little pump will help to flow the gas inside the cell and then allow a good interaction with the waveguide. But input and output from the flow through cuvettes will be very helpful.

I hope this will help and good luck !

Hello Joerg,

I'm a bit late - just now discovered your question...

Happens that a colleague of mine did her PhD on EMC measurements using EO sensors. She has an account on RG - including some applications:

Regards

Licor sells an industry-standard silicon-based PAR sensor...

I suppose the answer is that Resonant Fiber Optic Gyro (RFOG) just does not work well enough, despite many tricks attempted to do so.

I can send you the cross-sections of the Yb fibers we have at our company.

You could try cleaving with a CO2 laser

I'm trying to size particles in the half micron and up range, with additional information about physical properties. 

I have a relative who is a mechanical engineering student at MIT. Last summer he worked in the MIT Media Lab where his task was to develop a system that could remotely monitor the location of a dog in a room. I think his work could be modified to do what you need, and it would relatively inexpensive to develop.

Here is what he had to say:

"For my project, I was using a library for Python called OpenCV. I programmed in Python because someone else started the project in Python, but if you wanted to use the library I would recommend programming in C++ since there is more documentation for the library. It's an open source computer vision library that's capable of doing all sorts of things from object recognition and 3D mapping to image processing. I was using the image processing part of it to threshold each frame from a stationary camera with a known background to create a contour around the parts that changed in order to find the location of the dog. I used a standard webcam with a wide angle lens so that I had as wide a viewing angle as possible, but OpenCV can work with all sorts of different input devices, I think. It's a pretty powerful tool. As far as wireless, I'll bet that could be done with Bluetooth or a wireless card on an Arduino or something like that.

The main trick would just be figuring out how you could distinguish the information you're interested in. In my case, I took some frames of video and played with them in Photoshop to figure out what processes I would have to use in order to create a mask over the dog.

Sounds like you could certainly use OpenCV for that problem."

I hope this is helpful.

I believe the answer to your question is: no.

The reason is that when you try to do cloaking (eg. using metamaterials) all the techniques are narrowband. To get true invisibility you need your technique to work over a wide band. I there are no good wideband techniques.

I also got a S-V characteristic stright line plot for Co and Fe. bit confused to see how the collective quenching property is acting here.

Thanks Andy Monkman and for the reference also.

Hi Harri

At first I want to appreciate for your nice comments.

Optical circuits are very low power circuits and they are much faster than electrical circuits. Actually they work at light speed. But one of the biggest problems is their size. They have still micron or even millimeter size. Today integrating the opitcal circuits is one of the most important branches in optical technologies.