Knock sensor

Also called a vibration sensor. The combustion of an internal combustion engine increases the compression ratio, which causes explosive abnormal combustion during ignition. A sound like a hammer hitting the cylinder is called knock. The sensor that detects this knock is called a knock sensor.

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Knock sensor

Fiber Optic Proximity Sensor

Linear Accelerometer

Magnetic Proximity Sensor

Fiber Optic Displacement Sensor

Calorimetric detectors

Differential photoelectric sensor