Ahydrogen sensor detects the occurrence ofhydrogen gas or the hydrogen gas sensor senses the hydrogen gas. It’s a system that can detect and monitor the hydrogen gas. There is a physical change when some material reacts with hydrogen and then the hydrogen sensors can easily detect the gas. Hydrogen gas sensors are used to find leaks. They are inexpensive, packed in, long-lasting, and easy to maintain as compared to usual gas detecting appliances. Hydrogen sensors give a quick action in a hydrogen atmosphere. They detect hydrogen reproducibly. There important factors should be there reliability, there responding time, there detecting performance. The self-powered hydrogen sensor can be simply organized and will have less maintenance cost.
Hydrogen gas sensors require heaters or other supplementary power but there are also many with low power use. Hydrogen sensors are usually adjusted at the manufacturing factory and are important for the safety and to avoid any harm. There are different types of micro hydrogen sensors like palladium sensors as palladium easily absorbs the hydrogen gas and forms palladium hydride and then we can detect the presence of hydrogen. But they depend strongly on temperatures as it responses late at low temperatures. Palladium has a unique property that can absorb hydrogen gas above 900 times for its own volume. So we can say that palladium could be the most promising sensor for sensing hydrogen.
There are also the optical fiber sensors which use a metal surface that changes color when it comes in contact with the hydrogen gas and micro mirror that detects the changes in the back reflected light having a thin layer of palladium at the end. Hydrogen is detected by metal impediment with fiber coated with a palladium. Hydrogen changes the refractive index of tapered fiber coated with palladium. In this way the gas can be detected.
There are some other hydrogen sensors type like the chemochromic hydrogen sensors which use a pigment which changes color when it comes in connection with hydrogen gas, this change may or may not be reversible, another is the thick film hydrogen sensors that depends on the electrical resistance of palladium hydrides. The absorption of hydrogen causes a considerable increase in electrical resistance and thus it can be sensed. Others are microelectromechanical system hydrogen sensor, diode based Schottky sensor use a palladium-alloy gate which absorbs the hydrogen that can be absorbed in the gate. Metallic absorbs hydrogen by ambient conditions, forming an insulator.
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