Germany STERITECH sensor STERITECH model STERITECH price

STERITECH sensors are sensors that use laser technology for measurement. They consist of a laser, a laser detector, and a measurement circuit. Laser sensors are a new type of measuring instrument; their advantages include the ability to perform non-contact long-distance measurement, high speed, high precision, large measuring range, and strong resistance to optical and electrical interference.

STERITECH sensor structure

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

STERITECH sensor principle

The essence of a grating displacement sensor is to measure position 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 also move up and down. 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 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 has reached a very 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.

STERITECH 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 the scrapping of the grating ruler. Care should be taken to prevent oil stains and water from contaminating the grating ruler surface to avoid destroying the distribution of grating lines and causing measurement errors. Grating ruler sensors should avoid working in environments with severe corrosive effects 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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