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  2. Quantum well infrared photodetector - Wikipedia

    en.wikipedia.org/wiki/Quantum_well_infrared...

    A Quantum Well Infrared Photodetector (QWIP) is an infrared photodetector, which uses electronic intersubband transitions in quantum wells to absorb photons. In order to be used for infrared detection, the parameters of the quantum wells in the quantum well infrared photodetector are adjusted so that the energy difference between its first and ...

  3. Water detector - Wikipedia

    en.wikipedia.org/wiki/Water_detector

    A water detector is an electronic device that is designed to detect the presence of water for purposes such as to provide an alert in time to allow the prevention of water leakage. A common design is a small cable or device that lies flat on a floor and relies on the electrical conductivity of water to decrease the resistance across two contacts.

  4. Gamma ray logging - Wikipedia

    en.wikipedia.org/wiki/Gamma_ray_logging

    It is a wireline logging method used in mining, mineral exploration, water-well drilling, for formation evaluation in oil and gas well drilling and for other related purposes. [1] Different types of rock emit different amounts and different spectra of natural gamma radiation.

  5. Level sensor - Wikipedia

    en.wikipedia.org/wiki/Level_sensor

    Conductive level sensors are ideal for the point level detection of a wide range of conductive liquids such as water, and is especially well suited for highly corrosive liquids such as caustic soda, hydrochloric acid, nitric acid, ferric chloride, and similar liquids. For those conductive liquids that are corrosive, the sensor's electrodes need ...

  6. Deepwater well integrity - Wikipedia

    en.wikipedia.org/wiki/Deepwater_well_integrity

    The detection of deepwater wellbore integrity can be generally divided into two aspects from global perspective: detection of wellbore pressure and wellbore temperature. By detecting the two important indicators of temperature and pressure, the change in borehole thickness of the casing string , as well as the location of leakage points and ...

  7. Density logging - Wikipedia

    en.wikipedia.org/wiki/Density_logging

    Density logging is a well logging tool that can provide a continuous record of a formation's bulk density along the length of a borehole.In geology, bulk density is a function of the density of the minerals forming a rock (i.e. matrix) and the fluid enclosed in the pore spaces.