Paper Info
Title
Design And Implementation Of A Novel Interferometric Microwave Radiometer For Human Body Temperature Measurement
Abstract
In this paper, the key technology of interferometric microwave thermometer is studied, the research can be applied to the temperature measurement of human body and subcutaneous tissue. This paper proposes a hardware architecture of interferometric microwave thermometer with 2 GHz bandwidth, in which the phase shifter is used to correct phase error and the quadrature demodulator is used to realize autocorrelation detection function. The results show that when input power is 7 dBm, the detection sensitivity can reach 176.54 mV/dBm and the temperature resolution of the microwave radiometer can reach 0.4 K. Correction algorithm is designed to improve the accuracy of temperature measurement. After correction, the phase error is reduced from 40 degrees to 1.4 degrees and when temperature changes 0.1 degrees C, the voltage value changes obviously. Step-by-step calibration and overall calibration are used to calibrate the device. Inversion algorithm can determine the relationship between physical temperature and output voltage. The mean square error of water temperature inversion by multiple linear regression algorithm is 0.607 and that of BP neural network algorithm is 0.334. The inversion accuracy can be improved by reducing the temperature range. Our work provides a promising realization of accurate, rapid and non-contact detection device of human body temperature.
Year
DOI
Venue
2021
10.3390/s21051619
SENSORS
Keywords
DocType
Volume
interferometric, microwave radiometer, correction algorithm, calibration, inversion algorithm, neural network
Journal
21
Issue
ISSN
Citations 
5
1424-8220
0
PageRank 
References 
Authors
0.34
0
6
Name
Order
Citations
PageRank
Guangmin Sun101.01
Pan Ma200.34
Jie Liu300.68
Chong Shi400.34
Jingyan Ma500.68
Peng Li6919.30