German sittin sensor sittin model sittin price

sittin sensors generally consist of 2 parts: the processing path and the processing element. The basic principle is based on the photoelectric effect, converting changes in the measured quantity into changes in optical signals, and then using photoelectric components to further convert non-electrical signals into electrical signals. The photoelectric effect refers to illuminating an object with light, which can be viewed as a series of photons with specific energy bombarding the object. At this time, the photon energy is transferred to electrons, and the entire energy of one photon is absorbed by one electron at once. After the electron receives the energy transferred by the photon, its state changes, thereby generating corresponding electrical effects in the illuminated object. The photoelectric effect is usually divided into 3 categories: (1) The phenomenon where electrons escape from the object surface under the action of light is called the external photoelectric effect, such as in phototubes and photomultiplier tubes; (2) The phenomenon where the resistivity of an object changes under the action of light is called the internal photoelectric effect, such as in photoresistors and phototransistors; (3) The phenomenon where an object generates electromotive force in a certain direction under the action of light is called the photovoltaic effect, such as in photocells.

sittin 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 components, and adjustment mechanisms. There are many structural forms of grating readheads, which are classified into direct-receiving readheads (also known as silicon photocell readheads, mirror-image readheads, beam-splitter readheads, and metal grating reflective readheads) based on structural characteristics and application scenarios.

sittin sensor principle

The essence of grating displacement sensors 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 use 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 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 ruler 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 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 ruler can be determined. By counting the square wave pulses, the displacement and speed of the grating ruler can be obtained.

sittin 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 whenever possible, and promptly clean chips and oil splashed onto the ruler to strictly prevent any foreign matter from entering the grating ruler sensor housing. Regularly check whether the installation 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 index grating surface with an ethanol mixture (50%) at regular intervals to keep the glass grating ruler surface clean. Grating ruler sensors are strictly prohibited from severe vibration and impact to avoid damaging the grating ruler; if the grating ruler breaks, the 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, and may also cause relative friction between the main and secondary gratings, damaging the chrome layer and thus the grating lines, resulting in scrapping of the grating ruler. Prevent oil 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 chrome layer and grating ruler surface, which would degrade the quality of the grating ruler.

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