Conference Paper

Dynamic Conditions of Reflection-Type Tactile Sensor.

DOI: 10.1007/978-3-540-69057-3_60 Conference: Haptics: Perception, Devices and Scenarios, 6th International Conference, EuroHaptics 2008, Madrid, Spain, June 10-13, 2008, Proceedings
Source: DBLP

ABSTRACT Considering tactile sensors there are two ways to acquire object information. These are spatial sensing with two dimensional devices and fast sensing with simple devices. Because the reflection-type tactile sensor uses a reflection image, both methods can be employed. Though there exist some dynamic characteristics in these two ways.

In this study, we first validate the hysteresis of the reflection-type tactile sensor. The results show the sensor can evaluate displacement less than 2 mm. Then we propose a novel interface called "fibratus tactile sensor." Secondly we construct a fast sensing device using reflection image and a combination of light emitting diodes (LEDs) and photodiodes (PDs), and validate the sensor's reactivity. It can distinguish 300 ms interval between two signals. Moreover the correlation between the standard deviations of the acquired outputs from the sensor and the centerline average roughness is 0.90.

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    ABSTRACT: In recent years, tactile sensors have become an important interface for information devices. Our goal is to develop a simple and sensitive tactile sensor. We have proposed a reflection-image-based tactile sensor. The key points of this sensor were its simplicity and use of an optical device. In this study, we propose a design of a distributed-force sensitive touch panel following the previous developments. We employ an LED (light emitting diode) and PDs (photo diodes) in the new reflection-type tactile sensor. We investigate the illumination distribution and its changes under some simple deformation of the sensor surface with a ray-trace simulation. Then, based on the results of the experimental simulations, we also propose a method for estimating a given deformation from the illumination distribution.
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    ABSTRACT: Several tactile sensors have layers for the purpose of filtering information. Human also has layers in his finger. This paper describes the physical role of these layers. By using FEM simulator we research about the roles of the layers, and design the layers for reflection-type tactile sensor in order to detect small displacement. Additionally we compare the filtering role of layered structure between human finger and reflection-type tactile sensor.
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    ABSTRACT: Today there are many tactile sensors in the world. Though there is few sensor whose characteristics are similar to cutaneous sensation of human. If we want to measure the tactile information of human we have to use human-like tactile sensor. Here we have developed a reflection-type tactile sensor by using imaging device. This sensor employs a simple total reflection characteristic, so it has many degrees of freedom of selecting sensing units, and designing layer structures. This paper describes the design of the sensing unit and the structure of layers which has similar characteristics of human. First we compare the temporal frequency of the proposed sensor and human skin. Second we estimate the required spatial density of sensing units by simulation. Then we compare the total ability of proposed reflection-type sensor and cutaneous sensation of human.
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