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  2. Hydrogen sensor - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_sensor

    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.

  3. Automatic door - Wikipedia

    en.wikipedia.org/wiki/Automatic_door

    The automatic door used a mat actuator. In 1960, they co-founded Horton Automatics Inc and placed the first commercial automatic sliding door on the market. [5] With the invention of the Gunn diode, microwave motion detectors became common in automatic doors in the 1970s. [6] [7] In 1980, the first automatic door using an infrared sensor was ...

  4. Chemiresistor - Wikipedia

    en.wikipedia.org/wiki/Chemiresistor

    Simplified schematic of a single gap chemiresistive sensor. (not to scale) A chemiresistor is a material that changes its electrical resistance in response to changes in the nearby chemical environment. [1] Chemiresistors are a class of chemical sensors that rely on the direct chemical interaction between the sensing material and the analyte. [2]

  5. Hydrogen safety - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_safety

    In fuel cell applications these odorants can contaminate the fuel cells, but researchers are investigating other methods that might be used for hydrogen detection: tracers, new odorant technology, advanced sensors, and others. [1] While hydrogen flames can be hard to see with the naked eye (it can have a so-called "invisible flame"), they show ...

  6. Ion-selective electrode - Wikipedia

    en.wikipedia.org/wiki/Ion-selective_electrode

    ISE is a type of sensor device that senses changes in signal based on the surrounding environment through time. This device will have an input signal, a property that we wish to quantify, and an output signal, a quantity we can register. In this case, ion selective electrode are electrochemical sensors that give potentiometric signals.

  7. Gas detector - Wikipedia

    en.wikipedia.org/wiki/Gas_detector

    MOS sensors can detect different gases, such as carbon monoxide, sulfur dioxide, hydrogen sulfide, and ammonia. Since the 1990s, MOS sensors have become important environmental gas detectors. [3] MOS sensors although very versatile, suffer from the problem of cross sensitivity with humidity and other gases.

  8. The 7 best invisible hearing aids of 2024, according to ... - AOL

    www.aol.com/lifestyle/best-invisible-hearing...

    While not nearly as invisible as the Phonak Lyric, The Eargo 7 hearing aid is an over-the-counter, completely-in-canal aid with a nearly invisible look and barely there feel. Where it does beat ...

  9. Hydrogen sulfide sensor - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_sulfide_sensor

    The H 2 S sensor is a metal oxide semiconductor (MOS) sensor which operates by a reversible change in resistance caused by adsorption and desorption of hydrogen sulfide in a film with hydrogen sulfide sensitive material like tin oxide thick films and gold thin films. Current response time is 25 ppb to 10 ppm < one minute.

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