Program introduction:
Infrared human body thermometer is a temperature measuring instrument that uses infrared radiation.Before that, infrared temperature measurement was used in factory production to detect the temperature of products and monitor the heating status of equipment. Gradually, on a whim, people turned to human body temperature measurement to avoid direct physical contact between personnel (traditional temperature measurement equipment needs to be in contact with the human body during the temperature measurement process), greatly reducing the risk of cross-infection of diseases among personnel. At present, the infrared human body thermometer has the advantages of high precision, fast temperature measurement, and simple and convenient use. Nowadays, due to the needs of epidemic prevention, it is widely used in the temperature measurement of human body, which greatly improves the work efficiency of epidemic prevention personnel. At present, a single-chip microcomputer-based infrared human body thermometer solution has been developed, and the following is a specific knowledge description.
1. The principle of the infrared human body thermometer scheme
Taking advantage of the fact that all objects above absolute zero emit infrared rays, a special infrared probe sensor (infrared sensor sensor) is used to collect the infrared rays emitted by objects and convert them into weak uV~mV level voltage signals, and then amplify the voltage by nearly a hundred times to enter high-precision The high-resolution AD converter, the digital signal obtained is processed by the single-chip computer, and the actual temperature is obtained, which is expressed through the man-machine interface: LCD display or voice reporting or data transmission to the computer for centralized processing.
2. Infrared human body thermometer program function introduction
Infrared human body thermometer is designed and developed with ZHW3548 as the main control chip. It has powerful functions, built-in 256*8bits data memory SRAM, and comes with 4*16 LCD driver, which can meet most of the display screens and does not require external display. drive.
The cost of a single chip is low, and only a few resistors and capacitors are needed on the periphery.
This solution uses a high-precision single-chip microcomputer, which has high precision, fast temperature measurement, convenient calibration, and low defect rate; it has been adopted by many companies, and the main functional specifications are as follows:
Temperature measurement range Human body mode: 32°C~45°C, object mode: 0~100°C
Accuracy: ±0.2°C.
Low voltage reminder function
12~99 groups of memories can be customized
Three-color backlight
Automatic shutdown without operation for 8 seconds
In addition, the current production of infrared human body thermometers needs to be equipped with some necessary production equipment, such as precision constant temperature and humidity room, blackbody infrared temperature calibration source (blackbody water tank or electronic blackbody furnace), finished product test rack for temperature measuring gun, software burning Write tuning device. These equipments are particularly important for the production of the production line. Once there is a problem with the equipment, it needs to be replaced or repaired in time, otherwise the production line will directly stop, resulting in difficulties in delivery.
Performance parameters:
Industry Classification : Medical Electronics
Delivery Form : PCBA
Performance parameters: Main controller: ZHW3548
Application scenario: Household temperature measurement