Smart infrared ear thermometer program development
Recently affected by the epidemic, high temperature and fever are an important reference for the pneumonia epidemic caused by the new coronavirus. Therefore, body temperature testing has become an important means of screening for infected persons. In order to effectively prevent and control the epidemic, at present, body temperature measurement has been started at various traffic gates, hospitals, residential communities, enterprises and institutions with dense flow of people. Infrared temperature measurement is a non-contact temperature measurement, which is not only efficient, accurate, It is easy to use and can effectively avoid cross-infection. Therefore, the smart infrared ear thermometer has become one of the important products for epidemic prevention and control. The intelligent infrared ear thermometer is a thermometer specially used to measure the temperature of the tympanic membrane. The infrared radiation energy mainly emitted by the tympanic membrane is transmitted to the thermopile and other heat detectors through the infrared waveguide, and the infrared radiation energy is converted into electric energy for electricity Signal processing obtains human body temperature information.
table of Contents
1. Introduction of smart infrared ear thermometer
2. Advantages of smart infrared ear thermometer
Three, the principle of intelligent infrared ear thermometer temperature measurement
Fourth, the work process of the smart infrared ear thermometer
5. Functional specifications of the smart infrared ear thermometer
6. Analysis of types of smart infrared ear thermometer
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1. Introduction of smart infrared ear thermometer
The smart infrared ear thermometer is a non-contact telemetry (although it may be less than one centimeter) temperature measuring instrument. It uses the infrared spectrum emitted by the tympanic membrane (equivalent to the hypothalamus) to determine body temperature. According to the black body radiation theory , The infrared spectra produced by objects at different temperatures are also different, using a thermopile infrared sensor that can be accurate to 0.1, and then using a microcomputer to convert the readings to show it.
Smart infrared ear thermometer program development
2. Advantages of smart infrared ear thermometer
Taking advantage of the feature that all objects greater than absolute zero emit infrared rays, the infrared light emitted by the object is collected by a special infrared probe sensor (infrared sensor) and converted into a weak uV~mV voltage signal, which is then amplified by nearly a hundred times to achieve high precision High-resolution AD converter, the digital signal obtained through the complex processing of the single-chip microcomputer, the actual temperature is obtained, and expressed through the man-machine interface: LCD display or voice reporting or data transmission to the computer for centralized processing.
Smart infrared ear thermometer program development
Three, the principle of intelligent infrared ear thermometer temperature measurement
When the object is above absolute zero, because of the movement of the charged particles inside, it radiates energy in the form of electromagnetic waves of different wavelengths. The wavelength involves ultraviolet, visible and infrared light regions, but mainly in the near infrared of 0.76~3μm, 3~6μm Mid-infrared, 6~15μm far-infrared zone. The size of the infrared radiation energy of an object and its distribution according to wavelength are closely related to its surface temperature. Therefore, by measuring the infrared energy radiated by the object itself, its surface temperature can be accurately determined, which is the objective on which infrared radiation temperature measurement is based.
Smart infrared ear thermometer program development
Fourth, the process of smart infrared ear thermometer
The radiant energy of the human tympanic membrane is mainly in the 6-15μm region. The ear thermometer usually uses a thermopile sensor, which includes the above-mentioned optical system, photodetector---thermopile and thermistor. The thermopile sensor detects the far-infrared radiation intensity of the human tympanic membrane of 6~15μm. This measurement result is a relative quantity, that is, the result obtained is related to the radiation intensity of the measured object and the temperature of the thermopile itself. The thermistor is used to measure the temperature of the thermopile itself. By calculating the radiation intensity and the temperature of the thermopile itself, the temperature of the measured object can be obtained.
Smart infrared ear thermometer program development
Five, intelligent infrared ear thermometer function parameters
The calibration of the smart infrared ear thermometer is divided into ambient temperature and blackbody temperature calibration. Ambient temperature: put the sensor in the 25.00 +/-0.02 degree water tank, and press a key to confirm after it stabilizes. It usually takes 30 seconds. Black body temperature: first adjust the black body to 37.00+/-0.02 degrees, then insert the sensor into the black body, and press a key to confirm after it stabilizes. It usually takes 20 seconds.
1. Temperature measurement range: Forehead: 32-43 Surface temperature 0-60
2, measurement accuracy: ±0.3C
3, measurement time: ≤1 second
4. Measuring distance: 1-10CM
5. Measuring method: infrared measurement
6, emissivity: 0.95
7, infrared wavelength: 5-14um
8. Button: switch machine/memory, start
9. Function: high temperature alarm, memory temperature 10 times
10. Composition: Composed of thermopile infrared sensor, micro-processing memory, liquid crystal display and external
11. Scope of application: display the body temperature of the measured object by measuring the heat radiation of the forehead
12, can measure ear temperature and forehead temperature
13, low voltage prompt function
14, 60 seconds of no operation, automatic shutdown, more power saving;
15. Customizable time display, ambient temperature display, voice reporting, LED backlight, cold light film EL backlight and other functions.
Smart infrared ear thermometer program development
6. Analysis of types of smart infrared ear thermometer
Intelligent infrared ear thermometer is a measuring meter that uses the principle of radiation to measure the body temperature of the human body. The infrared sensor it uses only absorbs the infrared radiation radiated by the human body without emitting any rays to the outside world, and senses the body temperature of the human body through a non-contact method. There are two types: contact type and non-contact type.
Contact smart infrared ear thermometer: Take the ear thermometer as an example, which is mainly composed of a shell, a temperature probe, a temperature sensor, a PCB circuit, a liquid crystal display, a buzzer and a battery.
Non-contact intelligent infrared ear thermometer: Take the forehead thermometer as an example, which is mainly composed of infrared probe assembly, main circuit board assembly, LCD display assembly and shell assembly.
Smart infrared ear thermometer program development