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A Liquid Pressure Profile Sensor

IP.com Disclosure Number: IPCOM000122714D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 61K

Publishing Venue

IBM

Related People

Johnson, CW: AUTHOR [+3]

Abstract

Disclosed is a pressure profile sensor (PPS) developed for the purpose of measuring the impact pressure and pressure distribution of cleaning media spray upon a printed circuit board during a cleaning operation. The effectiveness of the printed circuit board cleaning operation is a direct function of the impingent pressure of the cleaning media upon the board; therefore, quantitative analysis of impingent pressure is essential to overall process analysis.

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This is the abbreviated version, containing approximately 73% of the total text.

A Liquid Pressure Profile Sensor

      Disclosed is a pressure profile sensor (PPS) developed for the
purpose of measuring the impact pressure and pressure distribution of
cleaning media spray upon a printed circuit board during a cleaning
operation.  The effectiveness of the printed circuit board cleaning
operation is a direct function of the impingent pressure of the
cleaning media upon the board; therefore, quantitative analysis of
impingent pressure is essential to overall process analysis.

      The basis of the sensor is an arrangement of two cantilever
beams, of spring steel, attached to a base plate by means of a pivot
block.  Strain gages are attached near the mid-point of the beam.
The gage configuration is a full wheatstone bridge with two arms
(gages) in tension and two in compression.  This configuration
provides maximum sensitivity and compensates for thermal gradients
experienced in the cleaning operation.  The impingent target is
located at the end of the cantilever beam.  The cantilever beams are
shielded such that only the target is exposed to the impingent stream
of cleaning media.  One target is exposed only to the stream from the
overhead manifold, the other to the lower manifold.

      The sensor assembly is attached to the conveyor in the printed
circuit card cleaner via clips on the leading edge of the base plate
(ref figure 1).  The sensor assembly is connected to a signal
conditioning/data acquisition system via a waterproof ca...