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Functional Fiber Optic Switch Sensor Introduced
Jun 19, 2017

Fiber optic switch, is a non-contact circuit switch, by the LED, fiber optic probe, photodetector, amplifier and output indicator light, fiber optic probe from the transmission fiber and receive fiber composition, the interval between the two have a certain detection space , The use of optical path in the detection of space through or off, through the photoelectric conversion circuit switch to achieve the role. With anti-interference ability, wide applicability and other characteristics, for a variety of automatic control equipment circuit switch.

If the above device with a single-mode fiber optic switch sensor instead of the air path is very different, cancel the length of the optical path strictly. The optical fiber-fiber coupler replaces the beam splitter, and is matched with other components to form a small fiber phase sensor. The fiber coupler divides the output beam of the laser into two equal parts or rejoins the two optical signals after transmission. Between the light source and the detector, the interferometer contains only the fiber element, and the transducer converts the measured phase to the phase change of the beam.

Non-functional fiber optic sensor is a fiber-optic fiber optic sensor fiber can only be used as the medium of transmission of light, the object to be measured by other optical conversion components to achieve, the state of the fiber is not continuous, fiber only from the role of light transmission.

Functional fiber optic switch sensor fiber in which not only the light guide media, but also sensitive components, functional fiber optic sensor is the light in the fiber by being measured modulation, the use of multi-mode fiber using the fiber itself is sensitive to the object being tested And the detection function, the external role of the optical fiber to spread the optical signal changes, so that the distance of light changes, phase change, this signal after processing, you can get the measured signal changes.

The beam splitter 1 divides the output beam of the laser into two parts, which are then overlapped by the transmission of the upper and lower optical paths so that they interfere with each other at the photodetector. This interferometer can measure the "moving plane mirror" very small displacement, with very high sensitivity. Although the air optical path interferometer has high precision and large dynamic range, it is very difficult to realize, and it can only work in the laboratory, which limits the application under practical conditions.