Temperature-compensated miniature cylinder pressure sensor for automotive applications

Marek T. Wlodarczyk

doi:10.1117/12.516687

8 March 2004 Temperature-compensated miniature cylinder pressure sensor for automotive applications

Marek T. Wlodarczyk

Proceedings Volume 5272, Industrial and Highway Sensors Technology; (2004) https://doi.org/10.1117/12.516687
Event: Optical Technologies for Industrial, Environmental, and Biological Sensing, 2003, Providence, RI, United States

Abstract

The 1.7 mm diameter pressure sensor utilizes the principle of light intensity changes, transmitted by two optical fibers, upon reflection from a specially shaped, metal diaphragm deflecting under the effect of pressure. In an ultra low-cost and durable design suitable for automotive applications the sensor compensates for all major temperature effects encountered in combustion engines. The auto-referencing function performed by the sensor’s signal conditioner compensates for the temperature induced LED, photodiode, and fiber-to-opto-electronics coupling errors, sensor thermal drift, as well as fiber bending related light intensity changes. The direct bonding of optical fibers to the photodiode and LED chips results in minimum thermal errors and high part-to-part consistency. Sensor head materials and dimensions are optimized to compensate for the sensitivity changes associated with the diaphragm’s Young’s modulus temperature dependence. The miniature signal conditioner, based on an LED-photodiode transceiver and an ASIC, can be integrated within an automotive connector or a package small enough to fit inside the engine head. Over the signal conditioner temperature range of -40°C to 150°C and the sensor head continuous range of -40°C to 300°C a typical total accuracy of 1-2% is achieved.

Citation Download Citation

Marek T. Wlodarczyk "Temperature-compensated miniature cylinder pressure sensor for automotive applications", Proc. SPIE 5272, Industrial and Highway Sensors Technology, (8 March 2004); https://doi.org/10.1117/12.516687

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