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Title: Method and Apparatus for Calibrating a Densitometer Based Sensor for Shot Peening
Author: RA Thompson, New York, NY
Source: US Patent 6,142,027
Publication year 2000
Document number: 2000019
Number of pages: 6
Abstract:
An apparatus and method are provided for calibrating a densitometer based sensor for measuring the linear density of the shot particles passing through a shot peening system
to ensure that mass flow rate readings and shot velocity readings calculated therefrom are accurate. The apparatus comprises a probe having a plurality of randomly
distributed particles configured to have a linear density substantially equal to the linear density of shot which the sensor should experience during operation of the shot
peening system at desired parameters. The method comprises recording a sensor reading of the particles of the probe with the probe inserted in the sensor, removing the
probe, dividing the known linear particle density of the probe by the sensor output to obtain the sensor calibration constant and multiplying each subsequent sensor output
taken during normal operation of the shot peening system by the calibration constant to obtain an accurate instantaneous linear density reading of the shot traveling through
the shot peening system.
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This page last revised: 04/24/2008