The role of automotive phase modulators
The function of the automobile phase modulator is to use the modulating signal to directly change the parameters of the resonant loop, so that the carrier signal will generate phase shift when passing through the resonant loop and form a phase-modulated wave. The application of phase modulator in automobile is mainly reflected in the dynamic regulation of engine intake phase and exhaust phase to improve engine performance and efficiency .
The working principle of the phase modulator is based on the linear electro-optical effect, which adjusts the phase of the light wave by changing the electric field strength. In the automotive sector, phase modulators are used to control the intake phase regulator and exhaust phase regulator, thereby optimizing the combustion process and exhaust efficiency of the engine .
Specific application scenarios include: under low speed or low load conditions, the intake phase regulator can advance the closing time of the intake valve appropriately, enhance the swirl and roll effect in the cylinder, and improve the combustion stability; At high speed or high load, it will delay the closing time of the intake valve, increase the intake stroke length, and improve the engine power output . In addition, phase modulators are also used in driverless cars, on-chip biosensors and other fields to achieve more complex optical control and signal processing functions .
A phase modulator is a mode of modulation in which the phase of the carrier carrier deviates from its reference phase in proportion to the instantaneous value of the modulated signal . The working principle of a phase modulator is based on this change, by adjusting the phase of the carrier to carry information.
Phase modulators are widely used in communication, optical measurement and beam control. For example, in space optical communication, phase modulators can achieve beam deflection by controlling the wavefront phase, which has important application value for key technologies such as target acquisition, tracking and aiming.
The advantages of the phase modulator include high sensitivity and practicality, but the disadvantage is that it can only be used for relative measurement and cannot be used for measurement of state quantities. In addition, phase modulation has the characteristics of high sensitivity in optical fiber sensing, but it also has its limitations.
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