Piezoresistive strain gauge sensor and signal conditioner for sensor applications

Piezoresistive strain gauge is one of the most popular and widely accepted sensors for strain measurement An analytical modeling is carried out for the gauge on the rectangular membrane called as substrate which includes resistivity of the plezoresistive material. Pro ENGINEER and ANSYS Multi physic...

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Main Author:	Thangamani Uthirapathi
Format:	Thesis
Published:	2007
Subjects:	TJ Mechanical engineering and machinery
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id	my-ums-ep.10224
record_format	uketd_dc
spelling	my-ums-ep.102242017-10-30T04:07:27Z Piezoresistive strain gauge sensor and signal conditioner for sensor applications 2007 Thangamani Uthirapathi TJ Mechanical engineering and machinery Piezoresistive strain gauge is one of the most popular and widely accepted sensors for strain measurement An analytical modeling is carried out for the gauge on the rectangular membrane called as substrate which includes resistivity of the plezoresistive material. Pro ENGINEER and ANSYS Multi physics software are used for the design and analysis respectively. Finite element analysis is used to find maximum strain sensitive area on the substrate. This helps to design the gauge with desired orientation to achieve maximum sensitivity. Polyimide is chosen as a substrate for strain gauge design among Polystrene and Silicon. Constantan is used as a gauge material for strain gauge design since its high peel strength makes the gauge less sensitive to mechanical damage during installation. A force sensor is designed on thin rectangular plate using the strain gauge which Is designed by ANSYS simulation. Temperature is one of the Important factor that affects the sensor performance. Hence the effect of temperature on the strain gauge and force sensor is considered In this research. A solution is given at sensor level in this research to do temperature compensation. Four-channel active element signal conditioner is developed that overcomes the drawbacks of passive element Wheatstone bridge. The hardware is developed on the printed circuit board (PCB) with its own dual power supply. EASYPC software and UV exposure, wet etching technique is used to design and fabricate the PCB. A temperature compensated force sensor is developed to verify the active element Signal conditioner linearity. The data acquisition board with 16-bit simultaneous sampling rate analog to digital converter (AOC) Is used to support real-time sensor data processing. MATIAS platform and its data acquisition toolboxes are used to process the real-time sensor data. The developed signal conditioner would suit for all kinds of sensor applications. A high gain of 93.9dB, a CMRR of 89.73dB, a delay of 25Âµsec, and a rise time of 150Âµsec are achieved by this signal conditioner. The self temperature compensating force sensor sensitivity Is 0.01MÎ©/N and a resolution is 0.15 mN. The sensitivity of the strain gauge designed by ANSYS is 0.425 ÂµÉ›/mPa. 2007 Thesis https://eprints.ums.edu.my/id/eprint/10224/ masters Universiti Malaysia Sabah School of Engineering and Information Technology
institution	Universiti Malaysia Sabah
collection	UMS Institutional Repository
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Thangamani Uthirapathi Piezoresistive strain gauge sensor and signal conditioner for sensor applications
description	Piezoresistive strain gauge is one of the most popular and widely accepted sensors for strain measurement An analytical modeling is carried out for the gauge on the rectangular membrane called as substrate which includes resistivity of the plezoresistive material. Pro ENGINEER and ANSYS Multi physics software are used for the design and analysis respectively. Finite element analysis is used to find maximum strain sensitive area on the substrate. This helps to design the gauge with desired orientation to achieve maximum sensitivity. Polyimide is chosen as a substrate for strain gauge design among Polystrene and Silicon. Constantan is used as a gauge material for strain gauge design since its high peel strength makes the gauge less sensitive to mechanical damage during installation. A force sensor is designed on thin rectangular plate using the strain gauge which Is designed by ANSYS simulation. Temperature is one of the Important factor that affects the sensor performance. Hence the effect of temperature on the strain gauge and force sensor is considered In this research. A solution is given at sensor level in this research to do temperature compensation. Four-channel active element signal conditioner is developed that overcomes the drawbacks of passive element Wheatstone bridge. The hardware is developed on the printed circuit board (PCB) with its own dual power supply. EASYPC software and UV exposure, wet etching technique is used to design and fabricate the PCB. A temperature compensated force sensor is developed to verify the active element Signal conditioner linearity. The data acquisition board with 16-bit simultaneous sampling rate analog to digital converter (AOC) Is used to support real-time sensor data processing. MATIAS platform and its data acquisition toolboxes are used to process the real-time sensor data. The developed signal conditioner would suit for all kinds of sensor applications. A high gain of 93.9dB, a CMRR of 89.73dB, a delay of 25Âµsec, and a rise time of 150Âµsec are achieved by this signal conditioner. The self temperature compensating force sensor sensitivity Is 0.01MÎ©/N and a resolution is 0.15 mN. The sensitivity of the strain gauge designed by ANSYS is 0.425 ÂµÉ›/mPa.
format	Thesis
qualification_level	Master's degree
author	Thangamani Uthirapathi
author_facet	Thangamani Uthirapathi
author_sort	Thangamani Uthirapathi
title	Piezoresistive strain gauge sensor and signal conditioner for sensor applications
title_short	Piezoresistive strain gauge sensor and signal conditioner for sensor applications
title_full	Piezoresistive strain gauge sensor and signal conditioner for sensor applications
title_fullStr	Piezoresistive strain gauge sensor and signal conditioner for sensor applications
title_full_unstemmed	Piezoresistive strain gauge sensor and signal conditioner for sensor applications
title_sort	piezoresistive strain gauge sensor and signal conditioner for sensor applications
granting_institution	Universiti Malaysia Sabah
granting_department	School of Engineering and Information Technology
publishDate	2007
_version_	1747836369460264960

Piezoresistive strain gauge sensor and signal conditioner for sensor applications

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