“The new coronavirus epidemic has caused a rapid increase in the market demand for temperature measurement products. Infrared thermometers, like masks, have become the key medical products for epidemic prevention and disaster prevention. Infrared thermometer, common market names include ear thermometer, forehead thermometer, etc., is a common second-class medical equipment.

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The new coronavirus epidemic has caused a rapid increase in the market demand for temperature measurement products. Infrared thermometers, like masks, have become the key medical products for epidemic prevention and disaster prevention. Infrared thermometer, common market names include ear thermometer, forehead thermometer, etc., is a common second-class medical equipment.

With the sharp increase in production and the increase in applications, many people have reported on the Internet that the thermometers used in some places are inaccurate. What is the reason? How should this problem be solved? This article will analyze the factors that affect the accuracy of infrared thermometers from the perspective of product design.

Body temperature measurement is divided into contact type and non-contact type. The contact type is mainly based on the principle of negative temperature coefficient thermistor (NTC: negative temperature coefficient), and the non-contact type is mainly based on the infrared principle (IR: Infrared):

China’s infrared temperature measurement equipment manufacturers are mainly concentrated in the Pearl River Delta and the Yangtze River Delta, which also highly overlaps with the geographical distribution of the entire medical device industry. The upstream and downstream related industrial chains of infrared temperature measurement equipment are as follows:

From the perspective of upstream supply chain management, there are three most critical factors affecting the accuracy of infrared temperature measurement equipment: infrared sensor performance, optical path system, and calibration system.

Note: This article mainly discusses infrared detectors (ear thermometer, forehead thermometer) based on the principle of thermopile. For the focal plane technology, please refer to the paper “Development of Infrared Focal Plane Detector Array Specifications” by Wang Yifeng and Huang Jiangping from Kunming Institute of Physics “.

The following takes the common Amphenol sensor company (ASTG) ZTP148-SR infrared thermopile sensor as an example to analyze the influence of sensor performance on the accuracy of temperature measurement. (https://www.amphenol-sensors.com/en/thermometrics/infrared-sensors/3308-ztp-148sr)

The structure of ZTP148-SR infrared thermopile sensor is shown in the figure below

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About Heilind Electronics:

Founded in 1974, Heilind Electronics has its global headquarters in Boston, USA, and has established more than 40 branches in China, Singapore, the United States, Germany, Brazil, Canada and Mexico. Heilind supports OEMs and contract manufacturers in every segment of the electronics industry, supplying products from the industry’s top manufacturers across 25 different component categories, with a particular focus on interconnect and electromechanical products. Its main distribution products include interconnects, relays, fans, switches, thermal solutions, bushings and wire harness products, crystals and oscillators, fasteners and hardware, sensors, and more.

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About Amphenol Advanced Sensors:

Amphenol Advanced Sensors, a business unit of the Amphenol Sensors Technology Group, is an industry leader in the development and manufacture of sensing elements, environmental monitoring equipment and systems. Its products measure and calibrate temperature, humidity, pressure, gas, etc., provide customers with key information, and help customers make real-time decisions. The application fields cover transportation, medical, industrial and pharmaceutical industries. Amphenol Advanced Sensors is committed to technical research on temperature, pressure, humidity and gas measurement, environmental monitoring systems, etc., and provides customized sensor solutions for safer, smarter and healthier lives.

references

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