Accession Number : ADA295387

Title :   Weighmat Sensor Investigation.

Descriptive Note : Technical rept.1 Oct 93-30 Jun 94,

Corporate Author : APPLIED RESEARCH ASSOCIATES INC ALBUQUERQUE NM

Personal Author(s) : Underwood, Richard B., III ; Lofton, Steven C.

PDF Url : ADA295387

Report Date : 01 JUN 1995

Pagination or Media Count : 184

Abstract : This research investigated questions which arose from earlier work examining the potential application of thin-film piezoresistive mats in weighing military trucks as part of treaty verification operations. The object of this research was to investigate the properties of the sensor elements to recommend suitable methods to control their impacts on accuracy. Applied Research Associates tested the sensor element at the Waterways Experiment Station to evaluate pressure sensitivity variations, temperature effects, and alternative calibration methods. The sensor element was found sensitive to temperature changes, becoming non-repeatable above the 100 degrees F. The element produced repeatable measurements within its operable temperature range. The sensor's response was confirmed to be nonlinear and hysteretic. Static creep was found to be predictable; hysteresis and sensor fatigue were found to be relatively minor factors in weighing vehicles. Short term memory of the element could affect accuracy if vehicles are weighed in close succession. The element's sensitivity to temperatures above 100 degrees F makes it currently impractical as a part of a field measurement device. However, it could be used under controlled temperatures in a screening/gating device. The principal recommendation of this study is to develop a piezoresistive material with a higher working temperature range. (AN)

Descriptors :   *PRESSURE TRANSDUCERS, *MILITARY VEHICLES, *SHOCK, TEST AND EVALUATION, DETECTORS, IMPACT, VERIFICATION, HIGH TEMPERATURE, STATIC LOADS, THIN FILMS, ACCURACY, SENSITIVITY, PRESSURE MEASUREMENT, WEIGHT, CREEP, FATIGUE(MECHANICS), TIRES, TRUCKS, CALIBRATION, PRINTED CIRCUITS, RANGE(EXTREMES), REPRODUCIBILITY, PRESSURE DISTRIBUTION, HYSTERESIS, FIELD EQUIPMENT, VARIABLE PRESSURE, FORKLIFT VEHICLES.

Subject Categories : Electrical and Electronic Equipment
      Surface Transportation and Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE