German INNOTECH sensors, INNOTECH models, INNOTECH prices

INNOTECH sensors are devices that measure the operating speed of an object under test and convert it into an output signal. Speed sensors include linear speed sensors and rotational speed sensors. With technological advancements, traditional measurement equipment can no longer meet current demands and is gradually being phased out, while laser speed sensors are widely used. They play a significant role in product manufacturing by enabling automated and intelligent measurement control through connection to computers. This represents the integration of modern measurement technology with computer technology.

INNOTECH 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 component of the grating detection device is the grating readhead, which comprises a light source, condensing lens, index grating, photoelectric elements, and adjustment mechanisms. Grating readheads come in many structural forms, classified based on their design and application into direct-reception readheads (also known as silicon photovoltaic cell readheads), mirror-image readheads, beam-splitter readheads, and metal grating reflective readheads.

INNOTECH sensor principle

The essence of a grating displacement sensor is measuring position using the grating pitch as a standard scale. High-resolution grating rulers are generally expensive and difficult to manufacture. To improve system resolution, Moiré fringes must be subdivided; grating ruler sensor systems mostly employ 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 grating pitch into the counting of Moiré fringe periods. Within one Moiré fringe width, placing 4 photoelectric devices at specific intervals enables electronic subdivision and direction determination. For example, for a grating ruler with 50 line pairs per mm, the grating pitch is 0.02mm. With four-fold subdivision, counting pulses with a resolution of 5μm can be obtained, achieving high precision suitable for general industrial measurement and control. Since displacement is a vector, both magnitude and direction must be detected, requiring at least two photoelectric signals with different phases. To eliminate common-mode interference, DC components, and even harmonics, differential amplifiers composed of low-drift operational amplifiers are typically used. The 4 photoelectric signal paths obtained from 4 photosensitive devices are fed into the inputs of 2 differential amplifiers. The two output signals from the differential amplifiers 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 ruler can be determined. By counting the square wave pulses, the displacement and speed of the grating ruler can be calculated.

INNOTECH sensor usage precautions

When plugging and unplugging the connector of the linear encoder sensor and the digital readout unit, ensure the power is turned off. Install an external protective cover whenever possible, and promptly remove chips and oil splashed onto the scale to strictly prevent any foreign matter from entering the housing of the linear encoder sensor. 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 let it splash onto the glass grating etched surface. To ensure reliable operation of the linear encoder sensor, periodically clean and wipe the linear encoder scale surface and the index grating surface with an ethanol mixture (each 50%), keeping the glass linear encoder scale surface clean. The linear encoder sensor must not be subjected to severe vibration or impact, as this may damage the linear encoder scale; if the scale fractures, the linear encoder sensor will fail. Do not disassemble the linear encoder sensor yourself, and never arbitrarily change the relative spacing between the main scale and the secondary scale. Doing so may compromise the accuracy of the linear encoder sensor and cause relative friction between the main and secondary scales, damaging the chrome layer and thus the grating lines, which renders the linear encoder scale unusable. Take care to prevent oil stains and water from contaminating the linear encoder scale surface, as this can disrupt the distribution of the grating lines and cause measurement errors. Avoid operating the linear encoder sensor in environments with severe corrosive effects, to prevent corrosion of the grating chrome layer and the linear encoder scale surface, which would degrade the quality of the linear encoder scale.

Weidou Intelligent Technology specializes in selling German INNOTECH sensors, INNOTECH proximity sensors, INNOTECH distance sensors, INNOTECH vision sensors, INNOTECH displacement sensors, INNOTECH load cells, INNOTECH speed sensors, INNOTECH photoelectric sensors, INNOTECH position sensors, INNOTECH angle sensors, INNOTECH tactile sensors, INNOTECH temperature sensors, INNOTECH pressure sensors, INNOTECH flow sensors, INNOTECH level sensors, INNOTECH motion sensors, and INNOTECH process sensors. All products are original imports from Germany. Customers are welcome to inquire and place orders.