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Views: 0 Author: Site Editor Publish Time: 2023-05-15 Origin: Site
First of all, it is necessary to determine the pixel level of the infrared thermal imaging camera purchased, and the level of most infrared thermal imaging camera is related to the pixel. The relatively high-end product pixels of civilian thermal imaging cameras are 640*480. The infrared pictures taken by this high-end thermal imaging camera are clear and delicate, and the minimum size measured at 12 meters is 0.5*0.5cm; The pixel is 320*240, and the minimum size measured at 12 meters is 1*1cm; the pixel of the low-end infrared thermal imaging camera is 160*120, and the minimum size measured at 12 meters is 2*2cm. The higher the visible pixels, the smaller the minimum size of the target that can be photographed.
Determine the temperature measurement range according to the temperature range of the measured object to select an infrared thermal imaging camera with a suitable temperature range. Most of the thermal imaging cameras currently on the market are divided into several temperature ranges, such as -40-120°C and 0-500°C. It is not that the larger the span of the temperature range, the better. The smaller the span of the temperature range, the more accurate the temperature measurement will be. In addition, when the general infrared thermal imaging camera needs to measure objects above 500°C, it needs to be equipped with a corresponding high-temperature lens.
The temperature resolution reflects the temperature sensitivity of an infrared thermal imaging camera. The smaller the temperature resolution, the more obvious the infrared thermal imaging camera perceives the temperature change. When choosing, try to choose a product with a small value of this parameter. The main purpose of the infrared thermal imaging camera to test the measured object is to find out the temperature fault point through the temperature difference. It is not very meaningful to measure the temperature value of a single point. It is mainly to find the relative hot spot through the temperature difference, which plays the role of pre-maintenance. .
To put it simply, the smaller the spatial resolution value is, the higher the spatial resolution is, the more accurate the temperature measurement is, and the smaller the spatial resolution value is, the smallest target to be tested can cover the pixels of the infrared thermal imaging camera, and the temperature of the test is the temperature of the measured target. real temperature.
If the spatial resolution value is larger, the spatial resolution is lower, and the smallest target to be tested cannot completely cover the pixels of the infrared thermal imaging camera, and the test target will be affected by its environmental radiation. The test temperature is the temperature of the measured target and its surroundings. The average temperature of , the value is not accurate enough.
The core component of the infrared thermal imaging camera is the infrared detector. At present, there are mainly two kinds of detectors, namely vanadium oxide crystal and polysilicon detectors. The main advantage of vanadium oxide detectors is the temperature measurement field of view:
The MFOV (Measurement Field of View) is 1, and the temperature measurement is accurate to 1 pixel.
Amorphous Silicon (polycrystalline silicon) sensor, MFOV is 9, that is, the temperature of each point is obtained based on the average of 3×3=9 pixels. The vanadium oxide detector has good temperature stability, long life and small temperature drift.
If the infrared image and the visible light image are combined and displayed, a lot of work will be reduced. The unknown hotspots in the infrared image can be judged based on the visible light image, and the automatic report generation will also greatly reduce the operation time.
