Germany FHF Funke+Huster sensor FHF Funke+Huster model FHF Funke+Huster price

FHF Funke+Huster sensors are devices or units that can sense pressure signals and convert them into usable output electrical signals according to a specific pattern. Pressure sensors typically consist of a pressure-sensitive element and a signal processing unit. Depending on the type of test pressure, pressure sensors can be classified as gauge pressure sensors, differential pressure sensors, and absolute pressure sensors. Pressure sensors are one of the most commonly used sensors in industrial practice, widely applied in various industrial automation environments, involving water conservancy and hydropower, railway transportation, smart buildings, production automation, aerospace, military industry, petrochemicals, oil wells, electric power, ships, machine tools, pipelines, and many other industries.

FHF Funke+Huster 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. The key part of the grating detection device is the grating readhead, which is composed of a light source, condensing lens, index grating, photoelectric elements, and adjustment mechanisms. There are many structural forms of grating readheads, which are divided into direct-receiving readheads (also known as silicon photovoltaic cell readheads, mirror-image readheads, beam-splitter readheads, and metal grating reflective readheads) based on structural characteristics and application scenarios.

FHF Funke+Huster sensor principle

The essence of a grating displacement sensor is to measure position using the grating pitch as a standard ruler. High-resolution linear encoders are generally expensive and difficult to manufacture. To improve system resolution, Moiré fringes need to be subdivided; grating sensor systems mostly use electronic subdivision methods. When two gratings overlap with 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 measurement of the number of Moiré fringes. Within one Moiré fringe width, placing 4 photoelectric devices at certain intervals enables electronic subdivision and direction determination. For example, for a linear encoder with 50 line pairs/mm, its 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 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 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 linear encoder can be determined. By counting the square wave pulses, the displacement and speed of the linear encoder can be obtained.

FHF Funke+Huster sensor usage precautions

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

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