By John G. Webster (Editor)
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Many accelerometers are manufactured with preamplifiers and other signal-conditioning circuits integrated with the transducer enclosed in the same casing. Some accelerometer preamplifiers include integrators to convert the acceleration proportional outputs to either velocity or displacement proportional signals. To attenuate noise and vibration signals that lie outside the frequency range of interest most preamplifiers are equipped with a range of high-pass and low-pass filters. This avoids interference from electrical noise or signals inside the linear portion of the accelerometer frequency range.
603-669-6400 or 800-227-5955 Fax: 603-669-6962 Kistler Instrument Co. 75 John Glenn Dr. : 800-755-5745 Lucas Control Products, Inc. : 800-745-8008 Fax: 800-745-8004 Metrix Instrument Co. : 805-581-3985 or 800-581-0701 Fax: 805-583-1526 PCB Piezoelectronics, Inc. : 617-237-6020 Fax: 508-651-9762 such that the vibrations measured will be less than 1 dB in linearity. It should be noted that an accelerometer’s useful frequency range is significantly higher, that is, to one-half or two-thirds of its resonant frequency.
The signal-conditioning, switching, and power-supply circuits are integrated to form a microaccelerometer. The device can directly be interfaced with a digital signal processor or a computer by using the data out Dout, data in Din, chip select CS, and clock synchronization SCLK pins. In some cases analog-to-digital converters and memory are also integrated. Force Feedback Accelerometers. These often must be digitized for use in digital systems. If they are used in inertial navigation systems there may be specific problems introduced by the accuracy requirements.
30.Instrumentation and Measurement by John G. Webster (Editor)