Length Sensors
Length sensors are widely used in a variety of industries and applications for accurate measurement of the size of an object or the distance between two objects. These sensors are available in a variety of shapes, sizes, and configurations for measuring length and range, including linear and rotary encoders, encoderless, eddy-current, eddy-current-based and caliper-based sensors.
Linear and rotary encoders utilize a physical contact between a sensing system and the object being measured. This contact usually consists of a measurement scale, such as a precision linear or rotary scale, and an actuator. The movement of the actuator is measured and translated into a readable signal. The signal is then transmitted to a controller which interprets the signal, and uses the signal to determine the length or distance of the object.
Encoderless length sensors rely on signal processing to measure the length or distance of an object. These sensors use signal processing to measure changes in voltage, frequency, or resistance in order to determine the size of an object. Encoderless sensors are often used in applications that require high accuracy and repeatability, such as automotive, industrial automation, robotics and medical applications.
Eddy-current sensors use a magnetic field to measure the thickness or distance of an object. The sensor generates an electrical signal when a target object is placed in the field. This signal is then transmitted to a controller, which interprets the signal and uses it to determine the thickness or distance of the object. Eddy-current sensors can measure objects with an accuracy of up to 0.001 in. and are ideal for measuring thin walls and small features.
Eddy-current-based length sensors use inductive eddy-current technology to measure the length or distance of an object. These sensors use a coil to generate an electromagnetic field which is then used to measure the length or distance of an object. Eddy-current-based sensors are capable of measuring lengths with an accuracy of up to 0.001 in. and are suitable for short-range measurements.
Caliper-based length sensors use mechanical contact to measure the length or distance of an object. These sensors are made up of a pair of arms which clamp onto the object being measured. The arms move in opposite directions, and the distance between them is measured. Caliper-based sensors are not as accurate as encoder-based or eddy-current-based sensors, but are relatively inexpensive and provide good repeatability.
Length sensors have a range of applications, from automotive, industrial automation and robotics, to medical and consumer applications. They can measure the thickness or length of an object with accuracy and reliability, allowing manufacturers and engineers to streamline their processes and reduce costs.
