Thermal Imaging•Frame Rate

March 6, 2023
Latest company news about Thermal Imaging•Frame Rate

The frame rate of infrared thermal imager represents the photographic time density of the thermal imager video, which can be used to indicate the speed of thermal imager photography.


The concept of frame rate of infrared thermal imager is how many pictures can output per unit time in the video process. The number of output pictures only represents the output time density. For example, 30Hz represents 30 pictures output per second and 60Hz represents 60 pictures output per second.


Although the total number of output pictures in one second is different, it doesn't mean that moving objects (such as cars in progress) that can't be captured at 30Hz can be captured at 60Hz.


latest company news about Thermal Imaging•Frame Rate  0


If two infrared cameras have the same integration time, which means the time they can take photos is the same. When the two thermal imaging cameras take pictures of the same moving object, the rendering effect of a single photo in the video is the same. If a single photo presents vague, they will both appear the same degree of ambiguity.


The maximum motion speed of target that can be photographed by the thermal imager, that is, the motion state can be captured by the infrared camera, is determined by the integral time of infrared thermal imaging camera. The integral time of uncooled thermal imager is generally 8-12ms. This parameter can be considered as the time when a thermal imager generates a picture. The reason is similar to the shutter speed of a digital camera. Whether it is 30Hz or 60Hz, the generation speed of a single photo in the video recording process is the same.


That is, it takes 8-12ms to generate each picture, and then it is transferred to the computer through data conversion and processing. Please note that only when the thermal detector is made of the same material, the infrared detector can generate same quantity of photos per unit time. The reason why the total amount per second is relatively small is that it has relatively large resolution, and its back-end data processing unit has four times more data operations.


To sum up, if the customer wants to see the process of high time density, he can choose a thermal imager with high frame rate. For example, if he needs to measure temperature 60 times a second, and the measured object does not move, it can be directly selected according to the frame rate. If the customer needs to observe the transient state, it is necessary to select a thermal camera with very small integration time. In fact, transients are generally accompanied by the need for high-speed photography.


As for the motion speed, most uncooled infrared thermal imagers have the same ability to take pictures. Only the total amount of processing per unit time can be different. If a user needs to take pictures about the instantaneous state of moving objects, if one device cannot take pictures clearly, other devices cannot take pictures either. Since the transient photographing is independent of the frame rate, but dependent on integration time.




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