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Automating Manufacturing Systems - Process Control and ...

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continuous sensors - 23.14<br />

Sealant to prevent moisture<br />

hookup wire<br />

isolated<br />

stud<br />

accelerometer<br />

isolated<br />

wafer<br />

surface<br />

Figure 23.14<br />

Mounting an Accelerometer<br />

Equipment normally used when doing vibration testing is shown in Figure 23.15.<br />

The sensor needs to be mounted on the equipment to be tested. A pre-amplifier normally<br />

converts the charge generated by the accelerometer to a voltage. The voltage can then be<br />

analyzed to determine the vibration frequencies.<br />

preamp<br />

Sensor<br />

Source of vibrations,<br />

or site for vibration<br />

measurement<br />

signal processor/<br />

recorder<br />

control system<br />

Figure 23.15<br />

Typical Connection for Accelerometers<br />

Accelerometers are commonly used for control systems that adjust speeds to<br />

reduce vibration <strong>and</strong> noise. Computer <strong>Control</strong>led Milling machines now use these sensors<br />

to actively eliminate chatter, <strong>and</strong> detect tool failure. The signal from accelerometers can be<br />

www.PA<strong>Control</strong>.com

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