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Sensors are usually designed so that the gas supply is limited by diffusion, and thus the output from the sensor is linearly proportional to the gas concentration. This linear output is one of the advantages of electrochemical sensors over other sensor technologies (e.g. infrared), whose output must be linearized before they can be used.
MEMS microcantilever resonating inside a scanning electron microscope Proposal submitted to DARPA in 1986 first introducing the term "microelectromechanical systems". MEMS (micro-electromechanical systems) is the technology of microscopic devices incorporating both electronic and moving parts.
Fusion of the sensor element with analog amplification, analog-to-digital converter and digital intelligence for linearization and temperature compensation on the same micro chip. 4th Generation Memory cells for calibration- and temperature compensation data are added to the elements of the 3rd MEMS sensor generation.
A hydrogen sensor is a gas detector that detects the presence of hydrogen. They contain micro-fabricated point-contact hydrogen sensors and are used to locate hydrogen leaks. They are considered low-cost, compact, durable, and easy to maintain as compared to conventional gas detecting instruments.
Metal oxide chemiresistor sensors were first commercialized in 1970 [12] in a carbon monoxide detector that used powdered SnO 2. However, there are many other metal oxides that have chemiresistive properties. Metal oxide sensors are primarily gas sensors, and they can sense both oxidizing and reducing gases. [2]
MEMS (including accelerometers, gyroscopes, digital compasses, inertial modules, pressure sensors, humidity sensors and microphones) Silicon High volume production IDM Switzerland: Teledyne DALSA: MEMS design and manufacturing with integration of individual foundry processes Silicon and polysilicon High volume production 6, 8 Pure-play Canada
Surface acoustic wave sensors are a class of microelectromechanical systems (MEMS) which rely on the modulation of surface acoustic waves to sense a physical phenomenon. The sensor transduces an input electrical signal into a mechanical wave which, unlike an electrical signal, can be easily influenced by physical phenomena.
A nondispersive infrared sensor (or NDIR sensor) is a simple spectroscopic sensor often used as a gas detector.It is non-dispersive in the fact that no dispersive element (e.g a prism or diffraction grating as is often present in other spectrometers) is used to separate out (like a monochromator) the broadband light into a narrow spectrum suitable for gas sensing.
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