German JUR MESS sensor JUR MESS model JUR MESS price

JUR MESS sensors, also known as torque sensors, torsion sensors, torque transducers, or torque meters, are divided into two main categories: dynamic and static. Dynamic torque sensors are also referred to as torque sensors, torque-speed sensors, non-contact torque sensors, and rotary torque sensors. Torque sensors detect the twisting moment on various rotating or non-rotating mechanical components. They convert the physical changes in torque into precise electrical signals. Torque sensors can be used in the manufacture of viscometers and electric (pneumatic, hydraulic) torque wrenches. They offer advantages such as high precision, fast frequency response, high reliability, and long service life.

JUR MESS sensor structure

It consists of two parts: the scale grating and the grating readhead. The figure on the right shows the structure of the linear encoder scale. The key component of the grating detection device is the grating readhead, which comprises a light source, condensing lens, index grating, photoelectric elements, and adjustment mechanisms. There are many structural forms of grating readheads, classified based on 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).

JUR MESS sensor principle

The essence of a grating displacement sensor is to measure position using the grating pitch as a standard ruler. High-resolution linear encoder 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 with a slight inclination, 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 one Moiré fringe width, 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. With four-fold subdivision, counting pulses with a resolution of 5μm can be obtained, which achieves 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, 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. 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 must first be shaped 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.

JUR MESS sensor usage precautions

When plugging and unplugging the grating ruler sensor and the digital display meter connector, ensure the power is turned off. Install an external protective cover whenever possible, and promptly clean chips and oil splashed onto the scale to strictly prevent any foreign matter from entering the grating ruler sensor housing. 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 grating ruler sensor, periodically clean and wipe the grating scale surface and the index grating surface with an ethanol mixture (50%), keeping the glass grating scale surface clean. The grating ruler sensor must not be subjected to severe vibration or impact, as this may damage the grating scale; if the grating scale breaks, the sensor will fail. Do not disassemble the grating ruler sensor yourself, and never arbitrarily change the relative spacing between the main scale and the secondary scale. Doing so may compromise the sensor's accuracy and cause relative friction between the main and secondary scales, damaging the chrome layer and thus the grating lines, which renders the grating scale unusable. Prevent oil and water contamination of the grating scale surface to avoid disrupting the grating line pattern and causing measurement errors. Avoid operating the grating ruler sensor in environments with severe corrosive effects, as this may corrode the grating chrome layer and the scale surface, degrading the quality of the grating scale.

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