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The principle and application of the infrared camera The infrared camera uses an infrared detector and an optical imaging objective to receive the infrared radiation energy distribution pattern of the target to be reflected on the photosensitive element of the infrared detector, thereby obtaining an infrared thermal image. The thermal image corresponds to the thermal distribution field on the surface of the object. In general, an infrared camera converts invisible infrared energy emitted by an object into a visible thermal image. The different colors above the thermal image represent the different temperatures of the object being measured.
The use of thermal imaging cameras involves several major steps:
1. Adjust the focal length 2. Select the correct temperature range 3. Know the large measurement distance of Zui 4. Is it only required to generate a clear infrared thermal image, or does it require accurate temperature measurement?
5. The working background is single. 6. Ensure that the infrared camera is stable during the measurement process. The specific steps are as follows:
1. Adjusting the focal length can adjust the image curve after the infrared image is stored, but it cannot change the focal length after the image is stored, and it can not eliminate other messy heat reflection. Guaranteed * time operation correctness will avoid operational errors on site. Carefully adjust the focus! If the overheated or too cold reflections above or around the target affect the accuracy of the target measurement, try adjusting the focus or measuring the orientation to reduce or eliminate the effects of reflection.
2. Do you choose the correct temperature range to know the temperature range of the target being measured? In order to get the correct temperature reading, be sure to set the correct temperature range. When observing the target, fine-tuning the temperature span of the instrument will result in good image quality. This will also affect the quality of the temperature profile and the accuracy of the temperature measurement.
3. Understand the large measuring distance of Zui When measuring the target temperature, be sure to know the large measuring distance of Zui that can get accurate temperature reading. For an uncooled micro-heat type focal plane detector, in order to accurately distinguish the target, the target image through the thermal imager optical system must occupy 9 pixels or more. If the instrument is too far from the target, the target will be small and the temperature measurement will not accurately reflect the true temperature of the target object, because the temperature measured by the thermal camera at this time averages the temperature of the target object and the surrounding environment. In order to get zui's accurate measurement readings, please fill the target field as much as possible with the instrument's field of view. Show enough scenes to be able to distinguish the target. The distance from the target should not be less than the small focal length of the camera's optical system, otherwise it cannot be focused into a clear image.
4. Is there any difference between just asking for a clear infrared thermal image or asking for an accurate temperature measurement? A quantified temperature profile can be used to measure the temperature of the site and can also be used to edit significant temperature rises. Clear infrared images are equally important. However, if you need to perform temperature measurement during work and require comparison and trend analysis of the target temperature, you need to record all targets and ambient temperature conditions that affect accurate temperature measurement, such as emissivity, ambient temperature, wind speed and direction, humidity. , heat reflection sources and so on.
5, a single work background For example, when the weather is cold, when testing outdoors, you will find that most of the targets are close to the ambient temperature. When working outdoors, be sure to consider the effects of solar reflection and absorption on the image and temperature measurement. Therefore, some older models of thermal imaging cameras can only be measured at night to avoid the effects of solar reflections.
6. Ensure that the instrument is stable during the measurement process. All long-wave NEC thermal imaging cameras can reach the frame rate of 60Hz. Therefore, during the process of capturing images, the image may be blurred due to the movement of the instrument. In order to achieve a good effect of zui, when freezing and recording images, the infrared camera should be as smooth as possible. When pressing the store button, try to be gentle and smooth. Even slight instrument shakes can result in unclear images. It is recommended to use a support under the arm to stabilize, or place the instrument on the surface of the object, or use a tripod to keep it as stable as possible.
The infrared camera uses an infrared detector and an optical imaging objective to receive the infrared radiation energy distribution pattern of the target to be reflected on the photosensitive element of the infrared detector, thereby obtaining an infrared thermal image, the thermal image and the surface heat of the object. The distribution field corresponds. In general, an infrared camera converts invisible infrared energy emitted by an object into a visible thermal image. The different colors above the thermal image represent the different temperatures of the object being measured.