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  • Non-Contact Measurement Instruments: Definition & Applications
    Non-contact type instruments are measurement devices that can measure physical parameters without coming into physical contact with the object being measured. These instruments provide significant advantages in sensitive measurements, contamination avoidance, and precise measurements of hazardous materials. Here are some examples of non-contact type instruments:

    1. Laser Rangefinder: Uses a laser beam to measure the distance to an object by calculating the time taken for the laser pulse to travel to the target and back.

    2. Infrared Thermometer: Measures the temperature of an object by detecting the infrared radiation emitted from its surface.

    3. Ultrasonic Sensor: Emits ultrasonic waves and calculates the distance to an object based on the time taken for the sound waves to bounce off the object and return.

    4. Capacitive Proximity Sensor: Detects the presence of a nearby object by measuring changes in capacitance between its sensing element and the object.

    5. Eddy Current Sensor: Uses electromagnetic induction to detect the presence of conductive materials nearby without touching them.

    6. Load Cell: Measures force, tension, or compression applied to an object by converting mechanical strain into an electrical signal without direct physical contact.

    7. Strain Gauge: Measures deformation and strain in an object by converting mechanical stress into an electrical signal.

    8. Accelerometer: Measures acceleration by detecting changes in capacitance between a stationary plate and a moveable seismic mass.

    9. Photoelectric Sensor: Detects the interruption or reflection of a light beam by an object to determine its presence, position, or movement.

    10. Fiber Optic Sensor: Utilizes optical fibers to transmit light signals and detect changes in light intensity, phase, or polarization caused by external factors.

    11. Time-of-Flight Camera (ToF Camera): Measures the time taken for light emitted by the camera to reach an object and return, allowing for depth mapping and 3D imaging.

    12. Holographic Interferometry: Utilizes lasers and holography to measure surface deformation, vibration, and stress without touching the object.

    13. Microwave Sensor: Detects the reflection or absorption of microwave signals to measure distance, speed, or presence of objects.

    14. Piezoelectric Sensor: Converts mechanical stress or vibration into an electrical signal, making it useful in sensing pressure, vibration, and acoustic waves.

    15. Particle Image Velocimetry (PIV): Non-intrusively measures fluid velocity by illuminating particles in the fluid with a laser and capturing their movement using high-speed cameras.

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