German Koerner Marus sensors, Koerner Marus models, Koerner Marus prices

Koerner Marus 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 product manufacturing processes; 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.

Koerner Marus 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-reception readheads (also known as silicon photovoltaic cell readheads, mirror-image readheads, beam-splitter readheads, and metal grating reflective readheads).

Koerner Marus sensor principle

The essence of a grating displacement sensor is to use the grating pitch as a standard ruler for position measurement. 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 the 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 one Moiré fringe width, placing 4 photoelectric devices at certain 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, a differential amplifier composed of low-drift operational amplifiers is usually 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 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 phase 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.

Koerner Marus sensor usage precautions

When plugging or unplugging the connector between the grating ruler sensor and the digital display unit, the power should be turned off. Add a protective cover as much as possible, and promptly clean chips and oil splashed onto the ruler to strictly prevent any foreign matter from entering the housing of the grating ruler sensor. Regularly check whether the installation connection screws are loose. To extend the life of the dust-proof sealing strip, apply a thin layer of silicone oil evenly on the sealing strip, taking care not to splash it onto the glass grating engraved surface. To ensure the reliability of the grating ruler sensor, clean and wipe the grating ruler surface and the index grating surface with an ethanol mixture (each 50%) at regular intervals to keep the glass grating ruler surface clean. Grating ruler sensors are strictly prohibited from severe vibration and dropping to avoid damaging the grating ruler; if the grating ruler breaks, the grating ruler sensor will fail. Do not disassemble the grating ruler sensor yourself, and do not arbitrarily change the relative spacing between the main grating and the secondary grating; otherwise, it may damage the precision of the grating ruler sensor on one hand, and cause relative friction between the main grating and the secondary grating on the other, damaging the chromium layer and thus the grating lines, resulting in scrapping of the grating ruler. Care should be taken to prevent oil stains and water from contaminating the grating ruler surface to avoid disrupting the distribution of grating lines and causing measurement errors. Grating ruler sensors should avoid working in environments with severe corrosion to prevent corrosion of the grating chromium layer and the grating ruler surface, which would degrade the quality of the grating ruler.

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