A HALF-BRIDGE TYPE STRAIN GAGE FOR USE AT ELEVATED TEMPERATURES
Technical documentary rept.
HIGH TEMPERATURE INSTRUMENTS ENGINEERING CORP BALA CYNWYD PA
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Development of the Half-Bridge strain gage is continued. Gage manufacturing and testing techniques were standardized. A theoretical analysis of gage performance is included. The following tests were made 1 response of gages to rapid radiant heating 2 measurement of gage factor at room temperature and as a function of temperature 3 response of gages to slow oven heating 4 gage drift at constant temperature. It is shown that 1 gage performance depends strongly on bridge voltage 2 the gage material selected on the basis of previous tests Nichrome is not fully acceptable for gage use, even in the Half-Bridge configuration, because of a metallurgical transition occurring above 1000 F 3 the poorest Nichrome Half-Bridge strain gages tested exhibited a temperature coefficient of less than 3 microohmsohmF to 1000 F, more than an order of magnitude better than currently available uncompensated high temperature gages 4 gage use above 1500 F is not generally feasible because of a lack of adequate cements and bonding techniques at these temperatures.
- Test Facilities, Equipment and Methods