A Position Sensor is an electronic device that facilitates mechanical position detection based on disturbances it detects in the environment. According to different measures, a position sensor can detect absolute position, absolute orientation, or relative position, including linearity, angular motion, or three-dimensional space.
Depending on the type of position sensor used, these devices can determine velocities, accelerations, gravity, and other physical quantities. This technology has many applications in our daily life, where we use it in various industries. It is imperative to understand how they work, how they are measured, and what factors influence their readings.
The key specifications of Position Sensors are speed, range, sensitivity, angle of detection, and response time. Speed is often affected by factors such as surrounding obstacles, frequency of movement, and battery power. While sensitivity is generally affected by the range and frequency of movements. Angular and relative position sensors provide higher levels of sensitivity, which are helpful in high-risk situations. While angle sensors offer good coverage area but notwithstanding severe environmental factors.
Optical angle sensors work well when low-light conditions prevail because illumination level variations result in signal misalignments. One more vital specification to consider when purchasing this type of product is whether the output signal is analog or digital.
The only analog output signal will produce a valid measurement. The output signal from position sensors can be influenced by insulation, dust, moisture, and heat. So it is essential to check whether the sensor can function adequately with these factors.
Types Of Position Sensors
Linear Position Sensors
A Linear Position Sensor is used in various applications and can be either an inductive or a passive type of sensor. The inductive type is usually placed near the garage doors and allows for continuous monitoring of the open and closed status of the garage.
If you need to do constant monitoring, then this is the type to get. In the passive type, the unit is generally placed on the side of a building or other structure to determine the opening and closing of a door or window. The passive type of Linear Position Sensor is used to determine the position of a person inside a building and a variety of other applications.
The benefits of using a linear position sensor are numerous. First of all, a suitable sensor will give you an accurate reading of the current position of an object or person. Second of all, a suitable sensor will allow you to determine the angle that an object is pointing at.
Thirdly, the sensor’s location can also tell you the direction that an object is pointing at, which can prevent accidental trips and falls if someone were to enter the wrong room. There are many different types of Linear Position Sensors that you can use for a variety of applications. The most common uses include Home Security, Fire Safety, Outdoor Security, Garage Door, and Window Sensors, and much more.
These sensors are available from many different manufacturers online and offline, and in some cases, you can have them professionally installed in your home for a small fee. There are also many places you can search for information about the particular type of sensor you are interested in. Remember to use common sense when looking at what is a Linear Position Sensor.
Capacitive Position Sensors
Capacitive Position Sensors (CPS) have an important role in industrial, medical, and product applications. They use a combination of capacitance and resistivity to sense changes in the underlying conductivity. Capacitive contacts can be implemented on various substrates, including metal, plastics, composites, epoxy, foam, rubber, and other non-porous materials.
A CCS is used for several different applications in many different industries and applications. Including vehicle control, thermal insulation, automatic power distribution, industrial, vehicle testing, and many others.
Non-capacitive position sensors are sensitive to changes in the temperature of a substance or medium. The two types of temperature-sensitive CCSs are frequency generation and temperature tracking. Frequency generation CCSs are generally used for high-precision applications. These devices are used in applications where the user must record and analyze data over long periods, such as plant monitoring.
Examples of non-frequency-driven CCSs include microwave cavity separation sensors, electrical and mechanical transmission sensors, and ultrasonic sensors. Besides, non-frequency-position sensors provide high-resolution imaging at low temperatures and high temperatures.
Capacitive and non-capacitive contact sensors are suitable for a wide range of applications. Most Capacitive Position Sensors are composed of semiconductor materials like an optoelectronic material with a capacitance substrate. A surface acoustic waveguides the interaction between the two.
The electrical field, which is formed between the two objects, varies according to a predetermined signal. Examples of capacitive position sensors include ultrasound receivers, piezoelectric sensors, and ultra-sonic contact sensors.
Inductive Position Sensors
Inductive Position Sensors One of the most common types of position sensors is the passive infrared sensor. This sensor can sense the temperature of objects in its immediate vicinity. This sensor detects the presence of infrared energy, which passes through objects and releases that energy into an internal circuit when the energy is detected.
When this sensor “hears” that energy. It activates a switch that will mechanically cause the door or window to lower and open, etc. This type of sensor has various uses, from protecting valuable items from being opened while storing to monitoring temperature levels in offices to detecting motion in warehouse environments. This particular type of sensor can even sense the human body heat and convert that into an electrical signal which can be used for voice activation.
Types of Inductive Position Sensors
Types of Inductive Position Sensors The other most common type of sensor used is the Hall-effect sensor. The Hall-effect sensor measures changes in magnetic fields by measuring the change in the amount of magnetic field affected by a magnet.
This change is sensed by two different types of inductive position sensors: the dynamic one. Which measures the change in the magnetic field due to the presence of an externally applied magnetic field, and the static one, which measures changes in the magnetic field across an area which does not have any externally applied magnetic field.
The dynamic one is more commonly used in manufacturing environments. In contrast, the static one is commonly used for applications where power is an issue and where power requirements would outweigh any savings in battery usage.
The third type of sensing widely used is the eddy currents sensor. This is also known as capacitive sensing. An induction current is passed through a conducting coil and the current sensing the change in capacitance caused by this current causes the induced alternating currents in the coils.
EDDs are used in many different industries and applications where high reliability and low power consumption are prioritized. They are commonly used in vehicle maintenance and electrical installation and medical imaging equipment and industrial machinery.
Common uses of eddy currents include medical diagnostic equipment. Electrical power distribution, and industrial and communication equipment applications where high reliability and endurance are key factors.