Product category:
Accelerometers and Vibration Sensors
News Release from: Endevco | Subject: Calibration services
Edited by the Engineeringtalk Editorial
Team on 15 October 2002
Hopkinson Bar shock accelerometer
calibration
Endevco now offers calibration services based on the Hopkinson Bar.
Endevco now offers calibration services based on the Hopkinson Bar Endevco's Model 2973A SMAC shock motion accelerometer calibrator will be used to perform controlled shock excitation for sensitivity calibration of accelerometers from 10,000 to 100,000g
This article was originally published on Engineeringtalk on 31 Mar 2003 at 8.00am (UK)
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Accelerometer resists interference
The Endevco Model 7293A Microtron accelerometer family uses unique variable capacitance microsensors and incorporates special filtering and shielding for EMI and RFI exposure.
The Model 2973A provides precise, repeatable control of drive momentum by controlling pressure with a voltage-to-pressure regulator and releasing it with an electrically operated poppet valve.
It also eliminates the need for paper diaphragms and features a simpler, more reliable bar suspension system.
Driven with pressurised air, a projectile with a shaped tip impacts a deformable aluminium mitigator on one end of the bar, generating a compression wave in the bar that imparts an acceleration to a test transducer mounted on the opposite end.
Strain gages on the bar measure the compression wave.
The relation between the strain rate and the acceleration is the basis of the calibration.
Depending on the version of the Hopkinson bar ordered, the test accelerometer can be mounted directly to the bar or onto a breakaway fixture which flies free from the bar after the shock pulse.
The use of the breakaway eliminates repeated exposures of the test transducer to reflections of the compression wave, and allows zero shift measurements.
The system can be used either manually, as a stand-alone device, or in an automated mode.
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