The Various Types of Tactile Sensor

Applied Tech Review | Wednesday, October 27, 2021

A tactile sensor is capable of detecting any physical interaction between the sensor and its environment.

FREMONT  CA: Tactile sensors are capable of detecting specific objects, such as their presence. Additionally, it may determine the shape, location, and orientation of the component. The item in touch with the sensor is pressure, allowing for the determination of pressure distribution. This device can also inspect an item, such as texture monitoring, joint checking, or damage detection. Tactile sensors are capable of detecting a wide variety of stimuli; they can detect the existence of an object and can also generate a tactile image. A tactile sensor contains numerous sensitive areas, which enable it to measure multiple properties.

Tactile sensors are used in robotics, computer hardware, and security systems. The tactile sensor is also utilized extensively in the touchscreens of mobile phones and computers. Additionally, an elevator button is a tactile sensor; tactile imaging is employed in medical imaging. Tactile sensors may also be used to detect vibrations. Tactile sensors can also be utilized as pressure-sensitive devices because they contain pressure-sensitive films that determine the pressure.

Tactile sensors come in a variety of configurations; some of them are:

Piezoelectric tactile sensor: When pressure is applied to a sensor element, it generates a voltage across it. This is called the piezoelectric effect. Voltage generation is proportional to applied pressure. There will be no requirement for an external sensor in this case. Durability and an extended dynamic range are two advantages of this type of sensor. Pressure measurements are possible.

Optical tactile sensor: There are two types of optical tactile sensors: intrinsic and extrinsic. In intrinsic sensors, the intensity of the light is adjusted by inserting an impediment into the light path. It has several advantages, including resistance to electromagnetic interference and a high resolution. There is minimal cabling necessary, and the processing circuitry can be located remotely from the sensor.

Capacitive tactile sensor: A capacitive sensor measures the difference in capacitance between two electrodes. This sort of capacitive sensor measures capacitance, which varies in response to applied pressure. The parallel plate capacitor's capacitance is proportional to the distance between the plates and their area, and the capacitance varies with load. This sort of sensor has the advantage of linear response and a wide dynamic range.

Magnetic tactile sensor: The magnetic tactile sensor operates in two modes: one is based on a change in flux density recorded using magneto-resistive devices, and the other is based on a change in magnetic coupling between windings caused by deformation of the magnetoelastic core. The sensor's features include its high sensitivity and lack of mechanical hysteresis.

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