PCBA scheme development -- infrared temperature measuring gun scheme
This infrared frontal temperature gun scheme adopts the single chip microcomputer (chip) of Xinhai company, which has many functional characteristics such as high precision, fast temperature measurement, convenient calibration and low defect rate. It has been adopted by many companies.
1、 Main functional specifications:
1. Temperature measurement range: forehead: 32-43 ℃, surface temperature: 0-60 ℃
2. Measurement accuracy: ± 0.3C
3. Measurement time: ≤ 1s
4. Measuring distance: 1-10cm
5. Measurement method: infrared measurement
6. Emissivity: 0.95
7. Infrared wavelength: 5-14um
8. Key: on / off / memory, start
9. Function: high temperature alarm, memory temperature for 10 times
10. Composition: it is composed of thermopile infrared sensor, microprocessor memory, liquid crystal display and external display
11. Scope of application: display the body temperature of the measured object by measuring the forehead thermal radiation
12. Ear temperature and frontal temperature can be measured
13. Low voltage prompt function
14. No operation, automatic shutdown for 60 seconds, more power saving;
15. Time display, ambient temperature display, voice counting, LED backlight, cold light El backlight and other functions can be customized.
2、 Working principle of ear temperature gun / forehead temperature gun
Using the feature that all objects greater than zero will emit infrared, the infrared emitted by the object is collected by the infrared special probe sensor (senser) and transformed into a weak UV ~ MV voltage signal. After nearly 100 times voltage amplification, it enters the high-precision and high-resolution AD converter. The obtained digital signal is processed by the single chip microcomputer to obtain the actual temperature, It is expressed through the man-machine interface: LCD display or voice counting or data transmission to the computer for centralized processing.
The ear temperature gun has complex principle and is a precision temperature measurement product, which has high requirements for the production process. Factories that first contact this field may face many difficulties in mass production; The company has specialized R & D engineers who can provide all-round technical support to ensure smooth and rapid delivery of customers.