What Is a Potentiometric Sensor?

A common electromechanical component of a potentiometer is widely used in various electrical and electronic equipment. A potentiometer sensor is a sensor that converts mechanical displacement through a potentiometer into a resistance or voltage output that has a certain functional relationship with it.

Potentiometer sensor

Right!

A common electromechanical component of a potentiometer is widely used in various electrical and electronic equipment. A potentiometer sensor is a sensor that converts mechanical displacement through a potentiometer into a resistance or voltage output that has a certain functional relationship with it.

Chinese name

Potentiometer sensor

Make up

Resistance element, brush, skeleton

Form

Sliding and rotating

Application

Production process inspection

Advantages

Simple structure, small size and high accuracy

Missing point

Requires large input energy

Simple structure, small size, high accuracy, light weight, large output number and stable performance. Its disadvantages are that it requires large input energy and easy wear between the brush and the resistance element.

According to its structure, it can be divided into wire-wound type, film type and photoelectric type. According to the characteristics of input and output, it can be divided into linear potentiometer and non-linear potentiometer. Most commonly used single-turn wire-wound potentiometers.

The potentiometer is composed of a resistance element, a brush, a skeleton and the like.

Form: straight-slip type and rotary type. There are two types of rotary type: single-circle rotary type and multi-circle rotary type. Contacts are usually silver, platinum iridium, platinum rhodium and other metals. The brush arm is made of phosphor bronze and other elastic materials. Insulation materials such as ceramics, phenolic resins, and engineering materials are commonly used for the skeleton.

In daily work, a potentiometer can be said to be a commonly used electromechanical component, which is widely used in various electrical and electronic equipment. The potentiometer resistance sensor can convert the linear or angular displacement input of the machine into a resistance or voltage output that has a certain functional relationship with it. In addition to linear and angular displacement measurement, it is also widely used to measure physical quantities such as pressure, acceleration, and liquid level.

The potentiometer type sensor has a simple structure, small size, light weight, low price, stable performance, low requirements on environmental conditions, large output signals, and generally does not need to be amplified, and it is easy to realize the conversion of functional relationships. However, due to the friction and limited resolution between the resistance element and the brush, its accuracy is generally not high and its dynamic response is poor, which is mainly suitable for measuring slower changes. There are many types of potentiometer sensors. According to the different input-output characteristics, potentiometer resistance sensors can be divided into two types: linear potentiometers and non-linear potentiometers; according to different structural forms, they can be divided into wire wound and thin film. Type, photoelectric type, etc.

Potentiometer resistance sensors are generally composed of resistance elements, skeletons and brushes. The motion of the brush relative to the resistance element may be a linear motion, a rotational motion or a spiral motion. When the measurement is changed, the resistance of the resistance element is moved by the brush contact, and the resistance value between the contact and the resistance element will change, which can realize the linear conversion between displacement and resistance. This is the potentiometer. How the sensor works. Resistive sensor is a kind of electrical parameter sensor that has been applied earlier. It has many types and is widely used. Its basic principle is to convert the change of the measured physical quantity into the change of the resistance value corresponding to it. After measuring the circuit, it reflects the change being measured. The potentiometric sensor has a simple structure, good linearity and stability. It can be combined with the corresponding measurement circuit to form a testing system such as force measurement, pressure measurement, weighing, displacement measurement, acceleration measurement, torque measurement, and temperature measurement. One of the indispensable means to achieve production automation.