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Spontaneous and highly accurate ultrasonic temperature measurement system for air conditioner in automobiles

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Title Spontaneous and highly accurate ultrasonic temperature measurement system for air conditioner in automobiles
 
Creator Zhan, Tung-Sheng
Wu, Sun-Li
Tsai, Wen-Yuan
 
Subject Continuous wave
Microprocessor
Multi-frequency
Phase detector
Ultrasonic measurement
 
Description 44-51
This paper presents a microprocessor-based, ultrasonic air temperature sensor system whose output controls temperature
adjustment of car air conditioner (AC). Perceived thermal comfort correlates better with temperature of bulk air than temperature
measured by conventional in-car temperature sensor. It uses ultrasonic measurement of changes in sound speed in air to
determine temperature of bulk air. Changes in sound speed are calculated from phase shift of multi-frequency continuous
wave. A 89c51 single-chip microprocessor-based signal generator and phase detector was used to record and calculate phase
shift and temperature. Advantages of proposed system are high accuracy, instant detection, wider range and low cost.
 
Date 2009-01-16T04:35:27Z
2009-01-16T04:35:27Z
2009-01
 
Type Article
 
Identifier 0022-4456
http://hdl.handle.net/123456789/2789
 
Language en_US
 
Publisher CSIR
 
Source JSIR Vol.68(1) [January 2009]