Researchers at the Kennedy Space Center in the United States have developed an instrument equipped with an infrared camera that can be used to detect small hydrogen fires. At present, the instrument has been developed as an alternative to the previous infrared and ultraviolet instruments used to detect hydrogen fire. The flames caused by the leakage of hydrogen storage tanks, valves and pipelines are very dangerous, because the visible light emitted by them is very weak and can hardly be noticed by the naked eye. Therefore, the demand for such instruments is rising. Compared with previous hydrogen fire detection instruments, the main performance of this instrument is that it can avoid false alarms because it can distinguish the infrared light emitted from the sun, welding torch and intentionally ignited hydrogen flames outside the field of view.
Like previous instruments of this type, this instrument is based on the principle of detecting external radiation above a threshold. But in addition, it also uses the characteristics it detects (this feature is different from the characteristics of the infrared light reflected from the light source outside the field of view of the instrument), so the false alarm rate of the instrument is more relevant than the previous threshold-based The instrument is greatly reduced.
The camera in this instrument is a palm-sized commercial camera. The image sensor he uses is a microradiometer array with an operating wavelength of 7.5 to 12.5 microns. The camera is also equipped with a circuit that can convert the microbolometer reading into a digital output. The output of the camera is connected to an embedded image processing computer via a high-speed serial data interface.
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