An infrared telemetry technique for making piston temperature measurements
Document Type
Conference Proceeding
Publication Date
2-1-1991
Department
Department of Mechanical Engineering-Engineering Mechanics
Abstract
An optical telemetry technique has been developed for obtaining piston temperatures in reciprocating engines. The technique employs a transmitter mounted on the underside of the piston which transmits the temperature information as frequency modulated infrared pulses. This signal is picked up by a photodetector mounted in the crankcase which is wired to an external receiving unit. The transmitter consists of a thermocouple or thermistor, voltage-to-frequency converter, calibrating circuitry, and an infrared light-emitting-diode. The receiver consists of a phototransistor, frequency-to-voltage converter, calibrating circuitry and voltage readout. The transmitter is powered by lithium batteries. The signal has been successfully transmitted at speeds up to 4500 RPM in a 2-stroke engine and up to 5000 RPM in a 4-stroke engine. The accuracy of the infrared telemetry device using thermocouples is ±2.8°C (95% confidence level).
Publication Title
SAE Technical Papers
Recommended Citation
Barna, G.,
Brumm, D.,
&
Anderson, C.
(1991).
An infrared telemetry technique for making piston temperature measurements.
SAE Technical Papers.
http://doi.org/10.4271/910051
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/3033
Publisher's Statement
© Copyright 1991 Society of Automotive Engineers, Inc. Publisher’s version of record: https://doi.org/10.4271/910051