Can infrared body thermometers be used outdoors at minus 20 degrees?

The deviation of minus 20 degrees measurement is very large, and the human infrared thermometer can only work normally at a certain ambient temperature. Usually the body temperature is measured at an ambient temperature below 16, and the data will be greatly deviated or even cannot be displayed, which is normal in terms of measurement principle.

Advantages: 1. Non-contact, no need to contact each other when measuring the temperature of the human body, avoiding the risk of infection and ensuring safety.

2. Rapid temperature measurement and accurate reading, suitable for quickly checking a large number of people.

3. There is no need to enter the other party's ear canal when measuring body temperature, and there is no need to change the earmuffs, which is clean and hygienic.

4. Laser positioning, accurately measure the temperature of the target part, and can measure the body temperature of the forehead, armpit, body surface and other places.

In the winter of 2021, almost all temperature measuring equipment is ineffective. What I learned is that there is a temperature measurement lens + sensor imported from Germany that can accurately measure the temperature in an outdoor environment of minus 20 degrees. At present, 360, Jieshun, AVIC, etc. are all in use.

At present, the effect is outstanding in Northeast China, Beijing, Xinjiang and other places.

Basically, it doesn't work, and the measurement deviation is very large. It is recommended to choose a human body temperature measurement device that is specifically designed for the outdoor environment, such as Big Tree Artificial Intelligence.

If you want to do this, you can switch this function by yourself.

Measurement technology: non-contact infrared temperature measurement, also known as radiation temperature measurement, generally uses thermoelectric or photodetector as the detection element. This temperature measurement system is relatively simple, which can realize the temperature measurement of a large area, or the temperature measurement of a certain point on the measured object; It can be portable or stationary, and it is easy to use.

Its manufacturing process is simple, the adult wood is low, the temperature measurement does not touch the measured object, has a series of advantages such as short response time, does not interfere with the measured temperature field, long service life, convenient operation, etc., but the use of infrared radiation to measure the temperature is also bound to be affected by external factors such as object emissivity, temperature measurement distance, smoke and water vapor, and its measurement error is large.

In nature, as long as an object above absolute zero (-273) is molded, it will constantly radiate infrared rays outward. The infrared thermal imager converts the infrared radiation on the surface of the object into a visible image through an optical system, an infrared detector chip and an electronic processing system. To put it simply, the principle of infrared thermal imager is to use the temperature of Lee-to-Li to image and convert the invisible infrared energy emitted by the object into a visible thermal image.

The different colors on the top of the thermal image represent the different temperatures of the object being measured.

The infrared thermal imager has the advantages of not being affected by visible light, 24-hour clear imaging, non-contact temperature measurement, smoke and fog penetration, etc., and can be applied to human body temperature measurement, industrial temperature measurement, automatic driving, fire protection, outdoor observation, etc.

Infrared thermometer can not measure room temperature, infrared thermometer is generally used to measure solid heat source, general molding machine screw temperature, heating circle temperature, human body, etc., infrared thermometer is through the reflected laser beam to sense the temperature.

Problems that should be paid attention to when using infrared thermometers:

1. Only the surface temperature is measured, and the infrared thermometer cannot measure the internal temperature.

2. The wavelength above 5um can not be measured through the quartz glass, the glass has very special reflection and transmission characteristics, and it is not allowed to accurately read the infrared temperature. However, the temperature can be measured through an infrared window. Infrared thermometers are best not used for measuring the temperature of shiny or polished metal surfaces (stainless steel, aluminum, etc.).

3. Locate the hot spot, to find the hot spot, the instrument aims at the target, and then scan up and down on the target until the hot spot is determined.

4. Pay attention to environmental conditions: steam, dust, smoke, etc. It blocks the optical system of the instrument and affects the accurate temperature measurement.

5. Ambient temperature, if the thermometer is suddenly exposed to the ambient temperature difference of 20 or higher, allow the instrument to adjust to the new ambient temperature within 20 minutes.

1. Only the surface temperature of the object can be measured, but its internal temperature cannot be measured. 2. The infrared thermometer cannot measure the temperature through the glass, which has very special reflection and transmission characteristics, and does not allow the infrared thermometer to read. However, the temperature can be measured through an infrared window.

The infrared sail line thermometer is not intended for temperature measurement on shiny or polished metal surfaces (stainless steel, aluminum, etc.). 3. To carefully locate the hot spot, find the hot spot, use the infrared temperature measuring instrument to aim at the target, and then scan up and down on the target until the hot spot is determined. 4. When using infrared thermometer, pay attention to environmental conditions:

Smoke, steam, dust, etc. They can block the optical system of the instrument and affect the temperature measurement. 5. When using an infrared thermometer, you should also pay attention to the ambient temperature, if the infrared thermometer is suddenly exposed to the ambient temperature difference of 20 degrees or higher, allow the instrument to adjust to the new ambient temperature within 20 minutes! Hey hey

The infrared thermometer can only measure the surface temperature, which means that the temperature sensor of the infrared thermometer hail shed is faulty and damaged, and the user can directly find a professional maintenance personnel to replace it.

The principle of use of infrared thermometer: infrared thermometer is composed of optical system, photodetector, signal amplifier and signal processing, display output and other parts. The optical system concentrates the infrared radiation energy of the target within its field of view, and the magnitude of the field of view is determined by the optical parts of the thermometer and their position.

The infrared energy is focused on the photodetector and converted into the corresponding electrical signal. The signal passes through the amplifier and signal processing circuit, and is corrected according to the algorithm of the instrument's internal therapy and the target emissivity, and then transformed into the temperature value of the measured target. In addition, the influence of the target and the environmental conditions in which the thermometer is located, such as temperature, atmosphere, contamination and interference, on the performance indicators and how to correct them should be considered.

1. The process is as follows:

1. Automatic shutdown and power-saving function The use of industrial infrared thermometer This product is used in various industrial objects such as detection, fire inspection, shipbuilding, painting, ink, petrochemical, machinery manufacturing and other applications.

2. How to use industrial infrared thermometer Industrial infrared thermometer operation steps a. Hold the handle of the instrument and point it to the surface of the measured object; b. Pull the measurement trigger button to start measuring; c. When measuring, the 'Scan' indicator will appear at the bottom right of the LCD screend. Release the measurement button, and the LCD screen will display the 'hold' prompt to indicate that the reading has been locked and helde. After releasing the measurement button, the instrument will automatically shut down after about 60 seconds. In use), the laser scanner, sound prompt, LCD backlight function can be turned on or off according to the demand.

3. During the measurement, if the measured temperature is higher or lower than the alarm temperature (see parameter setting method), the machine will "Di Di" alarm prompt. It is recommended to aim the thermometer at the object to be measured, always press the measurement button to hold, and perform scanning measurement on the measured object back and forth, so as to find the highest or lowest cold and heat source on the surface of the object for value collection.

2. About this thermometer: If you can accept the price of imported brands, it is best to choose imported brands, as the life and accuracy of domestic brands are not very good.