This paper presents a novel temperature sensor array by dispensing conductive composites on a flexible printed circuit board which is able to acquire the ambient temperature. The flexible temperature sensor array was fabricated by using carbon fiber-filled silicon rubber based composites on a flexible polyimide circuit board, which can both ensure their high flexibility. It found that CF with 12 wt% could be served as the best conductive filler for higher temperature sensitivity and better stability comparing with some other proportion for dynamic range from 30℃ to 90℃. The preparation of the temperature sensitive material has also been described in detail. Connecting the flexible sensor array with a data acquisition card and a personal computer (PC), some heat sources with different shapes were loaded on the sensor array; the detected results were shown in the interface by LabVIEW software. The measured temperature contours are in good agreement with the shapes and amplitudes of different heat sources. Furthermore, in consideration of the heat dissipation in the air, the relationship between the resistance and the distance of heat sources with sensor array was also detected to verify the accuracy of the sensor array, which is also a preparation for our future work. Experimental results demonstrate the effectiveness and accuracy of the developed flexible sensor array, and it can be used as humanoid artificial skin for sensation system of robots.
The design of flexible pressure and temperature sensor array, which will serve as the artificial skin for robot applications, is presented. Different conductive rubber，which has different kinds of conductive filler, is employed as the pressure and temperature sensing material. The pressure sensing material is carbon black (CB)/multi-walled carbon nanotubes (MWCNTS)/silicon rubber, the proportion of CB and CNTS is 6% and 4%, respectively. The temperature sensing material is carbon fiber/silicon rubber; the proportion of carbon fiber (CF) is 12%. Both of the materials are flexible enough to use as artificial skin. Small disks of pressure and temperature conductive rubber are bonded on predefined flexible interdigital copper array. The pressure and temperature sensitive properties of the sensor array are measured. The structure of the sensor array make the temperature sensing material doesn’t take any interference of pressure. The separate collection of pressure and temperature signals with the scanning circuits can effectively reduce the crosstalk between each sensing element. With this integrated sensor array, the images of pressure and temperature distribution have been successfully shown by LabVIEW. This flexible sensor array can be bended without any influence of performance, so the sensor array is flexible and sensitive enough to be used as robot skin.
The phenomena of homodyne and resonating in optical fiber rings (OFRs) are experimentally investigated. The beat noise characteristics in passive OFRs and active OFRs are revealed. The beat noise spectra of OFRs and homodyne interferometer with the same length of delay fiber line are compared. A substitute homodyne
interferometer configured by band-reject OFR is proposed.