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Laser-ultrasonics uses lasers to generate and detect ultrasonic waves. [1] It is a non-contact technique used to measure materials thickness, detect flaws and carry out materials characterization. The basic components of a laser-ultrasonic system are a generation laser, a detection laser and a detector.
Figure 3: [8] (a) Radial Thermopile and (b) Axial Thermopile Sensors Figure 4: [14] Axial sensor with 0.5 mm thickness. There are two main types of thermopile laser sensors which can be classified according to the geometric arrangement of the thermocouples inside the sensor element.
Diagram of a simple VCSEL structure. The vertical-cavity surface-emitting laser (VCSEL / ˈ v ɪ k s əl /) is a type of semiconductor laser diode with laser beam emission perpendicular from the top surface, contrary to conventional edge-emitting semiconductor lasers (also called in-plane lasers) which emit from surfaces formed by cleaving the individual chip out of a wafer.
Likewise, thickness variations in bubble lasers contribute to an unstable frequency spectrum, prompting scientists to look for alternative bubble liquids. [ 1 ] Bubble lasers have been made from soap solutions to which a few drops of fluorescent laser dye have been added. [ 1 ]
The laser flash method was developed by Parker et al. in 1961. [1] In a vertical setup, a light source (e.g. laser, flashlamp) heats the sample from the bottom side and a detector on top detects the time-dependent temperature rise. For measuring the thermal diffusivity, which is strongly temperature-dependent, at different temperatures the ...
Hall effect sensor; Wheel speed sensor; Airbag sensors; Automatic transmission speed sensor; Brake fluid pressure sensor; Camshaft position sensor (CMP) Cylinder Head Temperature gauge; Engine crankcase pressure sensor; Exhaust gas temperature sensor; Fuel level sensor; Fuel pressure sensor; Knock sensor; Light sensor; MAP sensor; Mass airflow ...
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