Also known as encoders, transducers and redheads, linear position sensors, or LPS, have been a boon to manufacturing practices. The inventors working for the Nartron Corporation created the device. Nartron filed a patent application in 1996. In the short time between then and now, the use of this product has led to many important developments. Measuring the movement of a component is called position sensing. It provides a signal to the motion controller. The signal can be either analog or digital.
Many industries rely on minute, accurate measurements of the movement of objects. They are used in scientific, industrial and military projects that include the use of scanners and high precision machining tools. Manufacturing that relies on robotics could not exist without them.
Optical and magnetic sensor are the predominant types used. Optical encoders are used for products requiring high resolution and shuttering. A variety of light sources are used including LEDs and laser diodes, sometimes referred to as injection laser diodes. The types of scales used with magnetic linear encoders are magnetic or passive and work by following the movement of magnets. They do not, however, provide the minute detail required for some uses like the for the linear position sensor.
When the environment is excessively dirty or if there is danger of breakage, the device is encased in a protective covering. Enclosed devices are used in locations like tool shops. Open instrumentation provides much more detailed accuracy. It must be used in a suitable environment that will not effect the results of the readings.
For scanners, glass or reflective scales are best, but types of scales vary. Chrome, metal, ceramics and plastics are often used, depending on the type of project underway. They can be glued to the substrate or mounted on a track. Some are self supporting.
If space is a problem, sensors are available in very small sizes and can provide resolutions of less than . 001 mm. The accuracy is perfect for highly precise applications. If the project undertaken involves large products, the size of the measuring device is larger.
Position sensors include the capacitive sensor. It is a non-contact device that gives very accurate electrical readings. When it is necessary to change output voltage in response to any changes in the magnetic field, Hall effect transducers are used. They are generally used for positioning, speed detection and proximity switching.
Inductive sensors are non-contact and can measure the change in the effective resistance of a coil. It does not require physical contact between the device providing the signal and the sensing element. Ultrasonic systems act as transmitters or receivers and transform electrical energy into acoustic energy. It works through air or water.
The configuration used depends on what is to be measured. If extended position sensing is required, multiple bridges are lined nest to a magnet that slides past them. Linear position sensors have aided in the development of many technologically advanced devices.
Choose from a wide selection of state-of-the-art scientific technologies including the accelerometer, calibration systems, and linear position sensor. These specialized tools like the pressure sensor and strain gauge are very popular among the aerospace and research industries.