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SAPRE sensors are sensors that measure the operating speed of the measured object and convert it into an output signal. Speed sensors include linear speed sensors and rotational speed sensors. With the development of technology, traditional measuring equipment can no longer meet current needs and has gradually been phased out, while laser speed sensors have been widely used. They play an important role in the product manufacturing process. By connecting to a computer, they enable automated and intelligent measurement and control of the measured object. This is the product of the combination of modern measurement technology and computer technology.

SAPRE sensor structure

It consists of two parts: the scale grating and the grating readhead. The figure on the right shows the structure of the grating ruler. The key part of the grating detection device is the grating readhead, which consists of a light source, condensing lens, index grating, photoelectric elements, and adjustment mechanisms. There are many structural forms of grating readheads, classified according to their structural characteristics and application scenarios into direct-receiving readheads (also known as silicon photovoltaic cell readheads, mirror-image readheads, beam-splitter readheads, and metal grating reflective readheads).

SAPRE sensor principle

The essence of a grating displacement sensor is to perform measurement using the grating pitch as a standard ruler. High-resolution grating rulers are generally expensive and difficult to manufacture. To improve system resolution, Moiré fringes need to be subdivided; grating ruler sensor systems mostly adopt electronic subdivision methods. When two gratings overlap with a slight inclination angle, Moiré fringes are generated in a direction roughly perpendicular to the grating lines. As the grating moves, the Moiré fringes move up and down accordingly. This converts the measurement of the grating pitch into the measurement of the number of Moiré fringes. Within the width of one Moiré fringe, placing 4 photoelectric devices at specific intervals enables electronic subdivision and direction judgment functions. For example, for a grating ruler with 50 line pairs/mm, its grating pitch is 0.02mm. If four-fold subdivision is adopted, counting pulses with a resolution of 5μm can be obtained, which achieves high precision in general industrial measurement and control. Since displacement is a vector, both its magnitude and direction must be detected; therefore, at least two photoelectric signals with different phases are required. To eliminate common-mode interference, DC components, and even harmonics, differential amplifiers composed of low-drift operational amplifiers are typically used. The 4 photoelectric signals obtained from 4 photosensitive devices are sent to the input terminals of 2 differential amplifiers respectively. The two signals output from the differential amplifiers have a phase difference of π/2. To obtain direction judgment and counting pulses, these two signals need to be shaped, first into square waves with a duty cycle of 1:1. Then, by comparing the phases of the square waves, the movement direction of the grating ruler can be determined. By counting the square wave pulses, the displacement and speed of the grating ruler can be obtained.

SAPRE sensor usage precautions

Power must be switched off before plugging or unplugging the connector between the linear scale sensor and the digital readout unit. Install an external protective cover whenever possible, and promptly remove chips and oil splashed onto the scale to strictly prevent any foreign matter from entering the housing of the linear scale sensor. Regularly check whether the mounting and connection screws are loose. To extend the service life of the dust-proof sealing strip, apply a thin, even layer of silicone oil to the strip, taking care not to splash it onto the glass grating etched surface. To ensure reliable operation of the linear scale sensor, periodically clean and wipe the linear scale surface and the index grating surface with an ethanol mixture (each 50%), keeping the glass linear scale surface clean. The linear scale sensor must not be subjected to severe vibration or impact, as this may damage the linear scale; if the linear scale breaks, the sensor will fail. Do not disassemble the linear scale sensor yourself, and never arbitrarily change the relative spacing between the main scale and the secondary scale. Doing so may compromise the accuracy of the linear scale sensor and may also cause relative friction between the main and secondary scales, damaging the chrome layer and thus the grating lines, which renders the linear scale unusable. Take care to prevent oil and water from contaminating the linear scale surface, as this can disrupt the distribution of the grating lines and cause measurement errors. Avoid operating the linear scale sensor in environments with severe corrosive effects, to prevent corrosion of the chrome layer and the linear scale surface, which would degrade the quality of the linear scale.

Weidou Intelligent Technology specializes in selling German SAPRE sensors, SAPRE proximity sensors, SAPRE distance sensors, SAPRE vision sensors, SAPRE displacement sensors, SAPRE load cells, SAPRE speed sensors, SAPRE photoelectric sensors, SAPRE position sensors, SAPRE angle sensors, SAPRE tactile sensors, SAPRE temperature sensors, SAPRE pressure sensors, SAPRE flow sensors, SAPRE level sensors, SAPRE motion sensors, SAPRE process sensors. Original imports from Germany. Welcome customers to inquire and order.