LOW COST OPTICAL PRESSURE SENSOR USING FLEXIBLE PDMS GRATING

Abstract

Pressure is a fundamental physical quantity or parameter which is used in field of sensor applications. Pressure sensors are used for different perspective in various field of research and industry. It has great interest in different of application like health care, automotive industries, aerospace industries and down-hall monitoring in oil wells. At present, there are many types of pressure sensors available like piezo-resistive sensor, capacitive type pressure, piezoelectric sensor but optical pressure sensors have different properties as high sensitivity, light weight, small size, environmental ruggedness, low cost compared with existing pressure sensors. We have designed the low cost optical pressure sensor using Polydimthylsiloxane (PDMS) an elastomeric polymer having 10:1 base and its cross linker regent network, based flexible grating which are crack free and durable and hybrid perovskite material Methyl-lade tri bromide (𝑀𝐴𝑃𝑏𝐵𝑟����) based Photodetector because perovskite or hybrid perovskite materials are highly light emitter and absorber due to its energy band gap tuneable flexibility and these are highly light sensitive materials. The range of applied pressure on the PDMS grating of 1.4μm grating pitch and 160nm grating depth is 0 to 0.3945MPa and sensitivity is 0.0263MP𝑎��������.Similarly the applied pressure range on PDMS grating having grating pitch 0.7μm and grating depth 50nm is 0 to 0.337692MPa and Sensitivity is 0.0263MP𝑎��������.Such type of sensor can be used in the treatment of neurological disorder problems like headache and blood pressure