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Fabrication and Testing of Photonic Thermometers

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Design of a Compact Analog Complex Correlator for Millimeter-Wave Radiation Temperature Measurement System.

Wangdong He¹, Anyong Hu¹, Chen Dong¹

¹School of Electronics and Information Engineering, Beihang University, Beijing 100191, China.

|July 8, 2023

Summary

This study introduces a novel Ka band millimeter-wave thermometer for accurate non-contact human body temperature measurement. The integrated six-port chip correlator offers high sensitivity and a compact design for reliable health monitoring.

Keywords:

Ka band analog complex correlator microwave radiometer noise measurement six-port thermometer

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Area of Science:

Microwave Engineering
Biomedical Instrumentation
Sensor Technology

Background:

Accurate non-contact human body temperature measurement is crucial for health monitoring.
Existing methods may face limitations in accuracy and non-contact capabilities.
Millimeter-wave technology offers potential for advanced thermal sensing applications.

Purpose of the Study:

To propose and develop a Ka band analog complex correlator for high-accuracy non-contact human body temperature measurement.
To integrate the correlator into a miniaturized handheld thermometer system.
To evaluate the performance and temperature sensitivity of the developed thermometer.

Main Methods:

Design and fabrication of a Ka band (32-36 GHz) analog complex correlator using an integrated six-port chip.
Implementation of the six-port technique for enhanced bandwidth and sensitivity.
Characterization of the correlator's dynamic range, correlation efficiency, and equivalent bandwidth.
Development of a handheld thermometer system incorporating the designed correlator.
Testing and validation of the thermometer's temperature sensitivity.

Main Results:

The designed correlator exhibits a wide dynamic range (-70 dBm to -35 dBm) and high correlation efficiency (92.5%).
The correlator's output shows a linear relationship with input noise power, confirming its suitability for temperature measurement.
The developed handheld thermometer system achieved a temperature sensitivity of less than 0.2 K.
The miniaturized system has dimensions of 140 mm × 47 mm × 20 mm.

Conclusions:

The proposed Ka band analog complex correlator and integrated six-port chip enable accurate non-contact human body temperature measurement.
The developed millimeter-wave thermometer system demonstrates high sensitivity and a compact form factor.
This technology holds promise for advanced, non-invasive health monitoring applications.