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Infrared thermometer

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Non contact forehead temperature measuring digital infrared thermometer gun(1)

infrared thermometer

Features of infrared thermometer:

1,It is equipped with high-precision infrared sensor, and boasts stable and reliable performance.
2,With strong adaptability to ambient temperature, the thermometer can still be normally used in the complex environment;
3,The new-type probe structure with independent intellectual property ensures more accurate measurements;
4,Large-size LCD screen with high-luminance backlight facilitates the clear-cut and soft display;
5,Two temperature display units of Celsius and Fahrenheit can be chosen; automatic power-off helps save electricity and energy;
Product Description
Size: 147.2*41*123.5mm
Temperature range: Body temperature 34.0°C~42.9°C (93.2°F-109.22°F), Object temperature 0°C~100°C(32°F-212°F)
Precision: 0.1°C
Error in measurement: ±0.2°C
Method: Non-contact mid forehead detection
Detection distance: 1cm-3cm
Response time: ≤2 sec
Auto power off: 12 sec
Data Storage: 32 sets
LED Indicators with sound alarm for different status: Green,yellow,red represents normal,low fever and high fever
Power: AAA battery*2
Storage: Temperature - 20°C~50°C (-4°F-122°F); relative humidity ≤90%
Operation: Temperature 16°C~35°C (60.8°F-95°F); relative humidity≤85%; atmospheric pressuren: 70 KPa~106 KPa
Method:Non-contact mid forehead detection
Power:AAA battery*2
Error in measurement:±0.2°C
Temperature range:Body temperature 34.0°C~42.9°C (93.2°F-109.22°F), Object temperature 0°C~100°C(32°F-212°F)
Size 147.2*41*123.5mm

How does "infrared thermometer" measure your temperature

Now these days, the most prestige on the street is the security personnel of public places and the staff of each community. No matter how big you are, no matter which planet you come from, we have to go there when we meet them. We have to raise our hands, or stretch our heads and get shot.

Although we have been shot many times in recent days, but for many friends, this thing is relatively rare in the previous life. Because of its strangeness, it leads to a lingering problem.

Why does the infrared thermometer know the temperature when you "shoot" it on your head? Does it get the accurate bottom? And does it affect the health of the relatives who are most concerned about it?

In fact, these problems will be solved one by one as long as we understand the principle of the temperature measuring gun. Although the principle is complex, don't worry

1、 Is it harmful to your health if you are shot too much with an infrared thermometer

Is it harmful to your health if you are shot too much by infrared thermometer? ——This is a classic question.

Infrared thermometer, scientific name is "infrared thermometer" or "infrared radiation thermometer". Many people tremble at the words "infrared" and "radiation".

Although the infrared thermometer is crowned with "radiation" and "infrared", it will not exert any influence on your body.

Because it's a receiver, not a transmitter.

Generally speaking, the principle of the infrared thermometer is to passively absorb the infrared radiation energy of the target, so as to obtain the temperature value of the object.

That is to say, your body diffuses radiant energy all the time, and the function of the infrared thermometer is to receive radiant energy from a certain area of your body. If there is any harm in this process, then we should worry about the radiation is also the temperature gun, maybe in case that a 1000 ℃ forehead is detected one day, it will be broken.

Does this mean that the working process of the infrared thermometer gun is like a thermometer, which can directly feel the "temperature signal" you send out through the air? ——That's not quite true.

All the infrared temperature gun can receive is electromagnetic wave of various wave bands, not direct temperature conduction. And the most important one, the transformation process from "electromagnetic wave information" to "temperature information", is to mention the real focus of today's discussion - blackbody radiation law.

2、 Blackbody radiation law

This time, the "principle of infrared temperature gun" is the blackbody radiation law:

In nature, all objects higher than absolute zero (- 273.15 ℃) are constantly radiating energy outward. The size and distribution of the object's radiation energy outward by wavelength are closely related to its surface temperature. The higher the object's temperature, the stronger the infrared radiation ability.

It's true that this sentence is the basis of everything, but I believe that if the inner sentence is not disassembled and the theory of blackbody radiation is not explained, almost no one can sink down to understand what it means.

It's very simple.

What's the use of this blackbody radiation law? To put it bluntly, physicists want to understand the conversion relationship between "electromagnetic wave information" and "temperature (energy) information".

So they imagined the "black body" thing.

It is assumed that "blackbody" is a standard "blackbody". Its characteristic is that all the incident electromagnetic waves are absorbed, neither reflected nor transmitted.

The infrared thermometer is designed according to this characteristic.

On the basis of this theory, there are three main design directions of infrared thermometer according to the different measurement accuracy required by engineering application.

First, the monochromatic infrared thermometry: using the monochromatic radiation intensity ratio under a single wavelength to judge the temperature;

Second, the two-color infrared thermometry: measure the intensity change of the ratio of the radiation intensity of the measured object under two wavelengths to judge, this method is less affected by the external environment than the former, and the error is smaller;

Can we understand the two above? Let's talk about the third in detail.

Third, total radiation infrared thermometry.

The name of total radiation infrared thermometry sounds the best, but it is actually the one with the worst accuracy among the three methods. However, its advantages lie in its simple structure and low cost.

The reason lies in the design idea of "making great efforts to work miracles" - total radiation infrared thermometry, which determines the radiation temperature of the object by measuring the total intensity of the whole wavelength of the radiation object.

How can we understand this concept? For example, we can make a meter mountain of the whole band radiation intensity map at a temperature. Now, let kabi eat the whole meter mountain. We can measure the total amount of heat radiation energy transformed after eating it, and finally derive the temperature value at that time.

(To be continued)