The application of thermal imaging camera

Abstract: The application information of infrared thermal imager is provided to you by excellent flowmeter and flowmeter manufacturers. Infrared thermal imager is to use some special materials to produce changes in certain physical quantities to infrared light radiation, and then convert this variable into an electrical signal, which is then converted into an image and temperature measurement after modulation. These special materials are mostly: mercury cadmium telluride, antimony. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application article details of infrared thermal imagers. Infrared thermal imager is to use some special materials to produce changes in certain physical quantities to infrared light radiation, and then convert this variable into an electrical signal, which is then converted into an image and temperature measurement after modulation. These special materials are mostly: mercury cadmium telluride, indium antimonide, platinum silicon, vanadium oxide, silicon doping (or polysilicon) and so on. so-called on the market“refrigeration”and“uncooled”The difference actually refers to whether there is a refrigerator, in fact, even if it is“uncooled”thermal imaging cameras, which also have elements such as so-called coolers to cool the detectors——Otherwise, when the detector itself is at room temperature, its background thermal noise will greatly reduce its temperature resolution capability. The author personally thinks: As far as the current technology is concerned, the overall performance of the cooled infrared thermal imager is still better than that of the uncooled infrared thermal imager. It doesn't emit infrared itself, it just passively absorbs it. This has two meanings: *, this feature plus the feature that any object in nature radiates infrared signals to the outside world, making it a device with extremely high military value; second, considering the magnitude of infrared attenuation in the air, as a high sensitivity How high are the requirements for detector materials! Especially when considering that [the thermal imaging camera] itself also has interference from infrared radiation. Therefore, from the day [infrared thermal imaging camera] was born, the level of technical secrecy and its price were very high. Here, let's not talk about the difficulty and yield of the production process of infrared detectors. We know: all temperatures in nature are at absolute zero -273.15°Objects above C are constantly radiating electromagnetic waves, including infrared bands, to the surrounding space due to their own molecular thermal motion, and their spectral range is relatively wide. The more intense the movement of molecules and atoms, the greater the energy of radiation, and vice versa, the smaller the energy of radiation. At this stage, [infrared thermal imaging cameras] can only respond to infrared light in a small spectral range. For example: 3 to 5µm or 8 to 14µm, the so-called“atmospheric window”——The atmosphere, smoke clouds, etc. absorb visible light and near-infrared light, but the thermal infrared rays of 3-5 microns and 8-14 microns are less affected. Therefore, these two bands are called thermal infrared“atmospheric window”. At the same time, the radiation intensity emitted by the object depends on the temperature of the target object and the radiation characteristics of the surface material of the object. The same substance has different abilities to radiate infrared energy under different conditions. The ratio of this capability to the black body in the illusion is the emissivity of the substance at this temperature. (A black body is an idealized radiator that absorbs all wavelengths of radiant energy, has no reflection or transmission of energy, and has an emissivity of 1 on its surface.) It should be noted that there are no true black bodies in nature. That is to say, whether the infrared thermal imager can observe the object depends on the temperature resolution and spatial resolution of the infrared thermal imager, as well as the infrared radiation intensity and area of ​​the surface of the measured object. We can even roughly understand it as: temperature Resolution is the ability to distinguish the smallest temperature difference, and spatial resolution is the ability to display this temperature difference. At this stage, the temperature resolution is based on the minimum discernible temperature difference of the detector when the ambient temperature is 30°C under the NETD experimental conditions, rather than the temperature resolution of the entire thermal imager. Because if the background noise of the detector itself is 0.06°C, the background noise brought by the subsequent processing must be higher than 0.06°C after superposition. As for how much it can achieve, it depends on the design and processing capabilities of the subsequent electronic circuit blocks of each manufacturer. . It is worth mentioning here that temperature resolution and temperature measurement accuracy are two different things. The former is the ability to distinguish the smallest temperature difference; the latter is the average temperature difference of repeated measurements. Friends who are new to thermal imaging cameras often confuse these two concepts. The spatial resolution cannot be equal to the field of view angle. The field of view angle refers to the lens. The spatial resolution actually refers to the resolution capability of the infrared thermal imager. It is related to the detector, circuit, and lens. It is a comprehensive index. mrad is the unit, 1.0mrad is one thousandth of a radian. Here, also introduce the number of pixels. Usually we see infrared manufacturers at home and abroad indicating on the technical parameters of their products: 320×240, 160×120, 120×120 or even 382×288, 640×480, which generally refers to the number of detector focal plane arrays, which can be understood as: the number of unit detectors, of course, the more the better.

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