7 sensing methods of the sensor

Date:2021-09-15 00:00

Proximity sensing usually means detecting:

a. Whether there is an object.

b. The size or simple shape of the object.

Proximity sensors can be further classified in operation as contact or non-contact, and analog or digital. The choice of sensor depends on physical, environmental and control conditions. These include:


Any suitable mechanical/electrical switch can be used, but since a certain amount of force is required to operate a mechanical switch, a microswitch is usually used.


These proximity sensors work by disrupting or disturbing airflow. Pneumatic proximity sensors are examples of touch sensors. But these products cannot be used for lightweight parts that could be blown away.


In its simplest form, an optical proximity sensor is dropped by breaking a light beam that falls on a light-sensitive device such as a photocell. These are examples of contactless sensors.

It is worth noting that the lighting environment of these sensors must be very careful, for example, optical sensors may be obscured by flashes during arc welding, dust and smoke clouds in the air may obstruct light transmission, etc.


Electrical proximity sensors can be contact or non-contact. Simple touch sensors operate by having the sensor and components form a complete circuit. Non-contact electrical proximity sensors rely on the principle of induction to detect metals or capacitance to detect non-metals.

Range Sensing:

Distance sensing involves detecting how close or far components are to the sensing location, although they can also be used as proximity sensors. Distance or distance sensors use non-contact analog technology. Use capacitive, inductive, and magnetic techniques for short-range sensing between a few millimeters and hundreds of millimeters. Perform longer-range sensing using various types of emitted energy waves, such as radio waves, acoustic waves, and lasers.