Are infrared thermometers accurate? DD Product Design

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.

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):

Thermistor Contact Temperature Measurement

Infrared Thermometer

Accuracy

0.1 degree

0.2 degrees (accuracy after calibration)

measure time

3~5 minutes

1~2 seconds

Measurement site

Body surface (skin, underarm), body cavity (nasopharynx, rectum, bladder), etc.

ear canal, forehead

Product Description

household Electronic thermometer

If interested in this application, click https://www.amphenol-sensors.com/en/thermometrics
/ntc-thermistors/epoxy/3334
-type-65 to learn more.

Are infrared thermometers accurate? DD Product Design

medical temperature probe

In order to avoid cross infection, most of them are for one-time use.

If interested in this application, click https://www.amphenol-sensors.com/en/thermometrics
/assemblies/860-biomedical-ma-series to learn more.
Are infrared thermometers accurate? DD Product Design

ear thermometer, forehead thermometer

Single-person temperature detection equipment, in order to avoid cross-infection, hospitals need to add disposable sheaths when using ear thermometers.

Are infrared thermometers accurate? DD Product Design

Infrared camera

Multi-person fever screening is mainly used in institutions with large traffic such as customs. Use focal plane technology.

Are infrared thermometers accurate? DD Product Design

Amphenol

Thermistor

model

Epoxy Interchangeable 65 Model

Are infrared thermometers accurate? DD Product Design

Thermistor MA series

Are infrared thermometers accurate? DD Product Design

Infrared temperature sensor ZTP-148SR

Are infrared thermometers accurate? DD Product Design

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:

Are infrared thermometers accurate? DD Product Design

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

Are infrared thermometers accurate? DD Product Design

As an authorized distributor of Amphenol, Heilind can provide relevant service and support to the market, and Heilind also supplies products from many of the world’s top manufacturers, covering 25 different component categories, and focusing on all market segments and all Customers, are constantly seeking a broad product offering to cover all markets.

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.

Heilind operates on strong inventories, flexible policies, responsive systems, knowledgeable technical support and unmatched customer service. In December 2012, Helian Electronics officially launched its Asia-Pacific business. Headquartered in Hong Kong, Helian Asia Pacific has set up a regional distribution center and a value-added service center in addition to the sales department; so far, Helian Asia Pacific has established sales in Hong Kong, Shanghai, Beijing, Qingdao, Suzhou, Changzhou, Wuhan, Xi’an, Shenzhen , Dongguan, Chongqing, Xiamen, Taipei, Singapore, Malaysia, India, Thailand, the Philippines, Vietnam, Indonesia and other places to open 23 branches and 3 warehouses (Hong Kong, Singapore and Suzhou), dedicated to bringing the core value of distribution back to the industry . For more information, please visit www.heilind.com; www.heilindasia.com; WeChat, Weibo, Facebook and Twitter.

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

1. GB-T 13584-1992 Infrared detector parameter test method
2. SN Mekhontsev ・ VB Khromchenko ・ LM Hanssen, NIST Radiance Temperature and Infrared Spectral Radiance Scales at Near-Ambient Temperatures, United States Government Contribution 2008
3.NP Avdelidis, A.Moropoulou, Emissivity considerations in building thermography, Energy and Buildings 35(2003): 663-667
4.J Non-extensive thermo statistical investigation of the blackbody radiation, Chaos, Solitons and Fractals 13(2002): 749-750
5. Zhang Jingyi, Experimental Research on the Accuracy of Blackbody Furnace, Journal of Chongqing Institute of Technology, 2003.416-418
6. Shen Guoyan, Song Ping, Discussion on the method of measuring body temperature with infrared thermometer, Instrument Technology, 2003.39-42
7. Wang Chenzhong, Emissivity and its influence on the measurement results of infrared thermometers, Jiangsu Quality, 2003.37-38
8. Schieferdecker J. Infrared therm opile sensors w ith high sensitivity and very low tem perature coefficient[J]. Sensors & Actuators A. 1995. 46-47: 422-427
9. https://baijiahao.baidu.com/s?id=1657490935443921967&wfr=spider&for=pc
10. http://www.cqn.com.cn/zj/content/2020-02/03/content_8109860.htm

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