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| | | Measurement Technology at Kistler | | |
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| | | | | | | | | | | | Crystal slicing directions | | | | Transversal | | | | Longitudinal : | < | | | | | | | > | | | | | | | | z\ | | | | s | | Shear | | | | y | | | | | | | | | | | | | |
| | | Quartz as a piezoelectric material Piezoelectric materials for sensor elements must exhibit very high mechanical strength and rigidity above all else. Other requirements include stable mechanical and electrical properties over a wide temperature range and a long service life. High sensitivity, good linearity, negligible hysteresis (that is identical rising and falling calibration curves) and high electrical insulation resistance are further advantageous characteristics. Quartz meets all of these requirements and is therefore ideal for sensors. It can be produced synthetically and has other properties that make it suitable for measurement. A synthetic quartz element, for example, can be used at temperatures of up to 300 °C. Quartz can be sliced at different angles to exhibit sensitivity to pressure or shear forces, depending on which of the three piezoelectric effects is to be used. The quartz crystal produces a charge signal directly proportional to the acting force. Due to the crystal's high rigidity the measuring deflection is correspondingly low, usually in the range of a few micrometers. The high natural frequency of the quartz element has advantages when measuring high-speed dynamic processes. Due to the minimal deflection, measurement of slow, quasistatic phenomena will only involve extremely small measuring errors. | | |
| | | E] Measuring wheels with piezoelectric sensors are described from page 26 onwards. | | |
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| | | K Please see page 50 onwards for more information about piezoelectric sensors in instrumented crash barriers. | | |
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| | | Advantages of piezoelectric measurement | | |
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| | | Quartz has excellent properties for the use as a force link: • High permissible surface pressure of 150 N/mm2 or more • Temperature resistance up to 300 °C • Very high rigidity • High linearity • Negligible hysteresis • Virtually constant sensitivity over a wide temperature range • Wide frequency range • Almost unlimited number of load cycles | | |
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| | | Ideal quartz crystals grown in house The extraordinary stability, robustness and compactness of quartz sensors has led to their widespread use in both scientific research and industrial development and testing. For the almost 50 years of its existence Kistler has been perfecting crystal-based sensors in terms of accuracy and precision, robustness and service life, quality and reliability. The company is continuing this optimization of its sensors and systems with crystallographic research and in-house growing of crystals, and ongoing miniaturization and equipping of products for extreme service conditions. Quartz measuring element in wide variety of sensors Quartz washers with piezoelectric properties can be stacked in sensors to allow measurement of one or more force components or a torque vector. | | |
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| | | In measuring wheels and crash barriers and for measuring forces and torques in automobiles Kistler offers piezoelectric • single-component and | | |
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| | | www.kistler.com | | |
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