Accession Number:

AD0453872

Title:

A HALF-BRIDGE TYPE STRAIN GAGE FOR USE AT ELEVATED TEMPERATURES

Descriptive Note:

Technical documentary rept.

Corporate Author:

HIGH TEMPERATURE INSTRUMENTS ENGINEERING CORP BALA CYNWYD PA

Personal Author(s):

Report Date:

1964-10-01

Pagination or Media Count:

155.0

Abstract:

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.

Subject Categories:

  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE