Thermometer's Law and Importance
Black body online thermometer radiation law: black body is an ideal radiator, it absorbs all wavelengths of radiation energy, no energy reflection and transmission, the surface of the emissivity of 1. It should be pointed out that there is no real black body in nature, but in order to understand and obtain the infrared radiation distribution law, a suitable model must be selected in theoretical research. This is Planck's quantum oscillator model of body cavity radiation, which is derived. Planck's law of blackbody radiation, which is the wavelength of the blackbody spectral irradiance, is the starting point of all infrared radiation theory, so called the blackbody radiation law.
The effect of the emissivity of an object on radiation temperature measurement: The actual objects present in nature are hardly black. The radiation amount of all actual objects depends on the wavelength of the radiation and the temperature of the object, and also relates to the types of materials constituting the object, the preparation method, the thermal process, and the surface conditions and environmental conditions. Therefore, in order for the law of blackbody radiation to apply to all real objects, a proportional coefficient, namely the emissivity, must be introduced in relation to the properties of the material and the surface state. The coefficient represents the degree of closeness of the thermal radiation of the actual object to blackbody radiation, with values ​​between zero and less than one. According to the law of radiation, as long as the emissivity of the material is known, the infrared radiation characteristics of any object are known. The main factors that affect the emissivity are: material type, surface roughness, physical and chemical structure, and material thickness.
When using an infrared thermometer to measure the temperature of a target, first measure the amount of infrared radiation that the target has within its band, and then use the thermometer to calculate the temperature of the target. The monochromatic thermometer is proportional to the amount of radiation in the band; the dual pyrometer is proportional to the ratio of the radiation in both bands.
The non-contact infrared aluminum thermometer uses infrared technology to quickly and easily measure the surface temperature of an object. This meter can quickly generate temperature readings without touching the object. The temperature is shown on the LCD. Lightweight, compact and easy-to-use infrared thermometers and thermal imagers can safely measure hot, dangerous or difficult-to-contact surfaces without contaminating or damaging the object under test. In addition, an infrared thermometer can generate several readings per second, compared to a few minutes with a contact thermometer.
Why use non-contact infrared aluminum thermometer?
A complete understanding of infrared technology and its principles is the basis for accurate temperature measurement. When using a non-contact device to measure temperature, the infrared energy emitted from the object to be measured passes through the optical system of the pyrometer or thermal imager and is converted into an electrical signal by the sensor. This signal is again displayed as a temperature reading and/or thermal image. There are several factors that determine the measurement accuracy. The most important factors are the emissivity, distance, and field of view.
The principle of infrared aluminum thermometer is:
A: The infrared aluminum thermometer can capture infrared energy radiated from all objects. Infrared radiation is a part of the electromagnetic spectrum that includes radio waves, microwaves, visible light, ultraviolet light, gamma rays, and X-rays. Infrared is between the visible spectrum of the spectrum and radio waves. Infrared wavelengths are usually expressed in micrometers and infrared spectrums range from 0.7 to 1000 micrometers. In practice, infrared temperature measurement uses a band of 0.7 to 14 microns.
What should you watch out for when choosing the measurement range of an infrared thermometer?
Like any testing equipment, try to use the mid-range of the instrument's range as much as possible in actual use, and avoid using both ends of the range, so that the instrument can be used reliably and stably. High-temperature objects Choose the infrared thermometer with a short wavelength of 0.9-2.5μm as much as possible to measure more steadily and accurately!
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