This section provides an overview for linear displacement transducers (ldt) as well as their applications and principles. Also, please take a look at the list of 16 linear displacement transducer (ldt) manufacturers and their company rankings.
Table of Contents
A linear displacement transducer (LDT) is a measurement instrument that enables non-contact measurement of the height, position, or distance of an object. It can also be used for thickness, width, and dimensional measurements, and can measure a variety of parameters depending on the application. Shared focus sensors and laser triangulation sensors can measure multiple points, such as thickness and width. The ability to perform a variety of measurements depending on the application makes them useful in a wide range of situations, from production and manufacturing to research and development.
Linear displacement transducers (LDT) are non-contact, high-precision measurements in the micron range, and have a short response time. In addition, measurement of rotating objects and measurement in confined spaces, which were previously difficult, has become easier with the advent of linear displacement transducers (LDT).
Because of these features, laser displacement gauges are used in a variety of industries, including the automotive, semiconductor, electrical and electronics, steel and metal, and medical industries. In the automotive industry, laser displacement gauges are used throughout the entire process of product completion, from receiving parts and assembling them to determining whether the product is acceptable or not.
The principle of linear displacement transducer (LDT) measurement is based on triangulation. The main components consist of a light emitter and a light receiver. The light emitting part consists of a light emitter and a light emitting lens, and the light receiving part consists of a linear image sensor and a light receiving lens. These parts are used to measure the object and detect the amount of displacement.
The measuring principle is as follows. First, light from the light emitter of the light emitter part is focused by the light emitter lens and projected onto the object. Part of the light reflects off the object and reaches the linear image sensor through the light-receiving lens of the light-receiving part. Here, a spot of light is created on the linear image sensor to detect the position of the object. As the object moves, the light spot on the linear image sensor moves, and the displacement of the object is detected by detecting the amount of movement.
In addition to the linear image sensor, a position sensitive device called a PSD (position sensitive device) is also available.
There are various ways to use a linear displacement transducer (LDT), but the most common are dimensional measurement, displacement measurement, and shape measurement.
Dimensional measurements include thickness measurements, step measurements, inner and outer diameter measurements, and other static dimensional measurements. It measures the distance to the reference surface and the distance to the measurement surface, and outputs the difference as a dimension.
Displacement measurement is a dynamic measurement, such as the amplitude of a vibrating object or the runout of a rotating object. The distance to the measurement point is measured at a fixed sampling cycle, and the displacement is calculated from the maximum and minimum values and output as a displacement value.
Shape measurement is used to measure the flatness of a surface, the curvature of a curved surface, and so on. It measures the distance between multiple points and outputs the shape of the measurement range based on the coordinates and measured values of the measurement points.
When the sensor head is attached to the drive mechanism, it is less rigid than a fixed sensor head, making it more susceptible to vibration and other disturbances. Therefore, for high-precision measurement, the sensor head is generally mounted on a rigid fixed stand and the measurement object is moved.
The accuracy of linear displacement transducers (LDT) depends on sensor characteristics and the external environment.
Sensor characteristics include linearity, temperature characteristics, as well as resolution, and accuracy is calculated by considering all of these factors.
For example, if the resolution is ±1 μm, linearity is ±0.2% F.S. (measurement range 20 mm), and temperature characteristic is ±0.08% F.S./°C (measurement temperature range 1 °C), linearity is 20 mm x 0.1% = 0.02 mm and temperature characteristic is 20 mm x 0.08 % = 0.016 mm. The sum of these results is ±0.037 mm, which is the measurement accuracy, meaning that measurements in microns are not possible.
Thus, even if the resolution is high, if the linearity or temperature characteristics are poor, accurate measurement is not possible. For high-precision measurement, it is better to use a sensor with a small measurement range and good linearity, and to measure in an environment with no temperature variation.
In addition, the color and surface condition of the object to be measured may also affect the measured value, so it is necessary to select a sensor that is appropriate for the condition of the object to be measured.
*Including some distributors, etc.
Sort by Features
Sort by Area
H2W Technologies, Inc. is based in Santa Clarita, California. H2W serves aerospace, amusement rides, medical, meteorology, photonics, and other industries as a distributor of motion control products. H2W has 3 product segments: linear motors, rotary motors, and linear stages. Linear motors includes voice coil actuators, brushless linear motors, brush linear motors, single axis linear stepper motors, dual axis linear stepper motors, linear induction motors, and polynoids. Rotary motors include rotary voice coil actuators, limited angle torque motors, and brushless rotary motors. Linear stages include voice coil stages, linear stepper stages, single rail stages, dual rail stages, crossed roller stages, air bearing stages, belt stages, and lead screw/ball screw stages.
Kinequip, Inc. was founded in 1946 in Buffalo, NY as a distributor of industrial parts, accessories, and kits. Today these offerings have grown to include motors, compressors, blower systems, clams, pumps, various fittings, gauges, and sensors, as well as pneumatic and high-pressure devices. Kinequip also serves as a distributor for individual device and parts manufacturers. Kinequip additionally offers custom-designed solutions ranging from R&D to unique components and special-made parts, as well as value added designs on demand.
Micro-Epsilon was originally founded in Osaka and Micro-Epsilon America was founded in 1998, headquartered in Raleigh, North Carolina. Micro-Epsilon develops, manufactures, and distributes sensors to aerospace, battery production, glass production, wind power, precision optics, medical technology, transportation, semiconductor, and other industries. Micro-Epsilon’s sensor product categories include inductive, capacitive, laser, confocal, laser distance, magneto-inductive, draw-wire, rotation speed, color, paint thickness measurement, and fiber optic sensors in addition to interferometers and other sensor equipment.
Number of Employees
Newly Established Company
Company with a History
This is the version of our website addressed to speakers of English in the United States. If you are a resident of another country, please select the appropriate version of Metoree for your country in the drop-down menu.