German LASER SPEC sensor LASER SPEC model LASER SPEC price

LASER SPEC 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 is gradually being phased out, while LASER speed sensors are widely used and play an important role in product manufacturing. 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.

LASER SPEC 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 scale. 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-reception readheads (also known as silicon photovoltaic cell readheads), mirror-image readheads, beam-splitter readheads, and metal grating reflection readheads.

LASER SPEC sensor principle

The essence of a grating displacement sensor is to perform measurement using the grating pitch as a standard ruler. High-resolution grating scales are generally expensive and difficult to manufacture. To improve system resolution, Moiré fringes need to be subdivided; grating scale sensor systems mostly use electronic subdivision methods. When two gratings overlap at a slight 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 determination. For example, for a grating scale with 50 line pairs/mm, the grating pitch is 0.02mm. If four-fold subdivision is used, 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 amplifier have a phase difference of π/2. To obtain direction determination 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 phase of the square waves, the movement direction of the grating scale can be determined. By counting the square wave pulses, the displacement and speed of the grating scale can be obtained.

LASER SPEC sensor usage precautions

When plugging or unplugging the connector between the grating scale sensor and the digital display unit, ensure the power is turned off. Add protective covers where possible, and promptly clean chips and oil splashed onto the scale. Strictly prevent any foreign objects from entering the housing of the grating scale sensor. Regularly check whether the installation screws are loose. To extend the life of the dust-proof sealing strip, apply a thin, uniform layer of silicone oil to the strip, taking care not to splash it onto the glass grating etched surface. To ensure the reliability of the grating scale sensor, clean and wipe the grating scale surface and the index grating surface with an ethanol mixture (50% each) at regular intervals to keep the glass grating scale surface clean. Grating scale sensors are strictly prohibited from severe vibration or impact to avoid damaging the grating scale; if the grating scale breaks, the sensor will fail. Do not disassemble the grating scale sensor yourself, and do not arbitrarily change the relative spacing between the main grating and the secondary grating. Otherwise, this may damage the precision of the grating scale sensor and cause relative friction between the main and secondary gratings, damaging the chrome layer and thus the grating lines, resulting in scrapping of the grating scale. Take care to prevent oil and water contamination of the grating scale surface to avoid disrupting the distribution of grating lines and causing measurement errors. Grating scale sensors should avoid working in environments with severe corrosion to prevent corrosion of the grating chrome layer and the grating scale surface, which would degrade the quality of the grating scale.

Weidou Intelligent Technology specializes in selling German LASER SPEC sensors, LASER SPEC proximity sensors, LASER SPEC distance sensors, LASER SPEC vision sensors, LASER SPEC displacement sensors, LASER SPEC load cells, LASER SPEC speed sensors, LASER SPEC photoelectric sensors, LASER SPEC position sensors, LASER SPEC angle sensors, LASER SPEC tactile sensors, LASER SPEC temperature sensors, LASER SPEC pressure sensors, LASER SPEC flow sensors, LASER SPEC level sensors, LASER SPEC motion sensors, LASER SPEC process sensors. Original imports from Germany. Welcome inquiries and orders from users.