Aluminum cladding thickness measurement probe and instrument having an automatic calibration and readout circuit coupled to a differential amplifier circuit
First Claim
Patent Images
1. A cladding thickness measuring signal processing circuit comprising in combination:
- a power supply circuit coupled to a voltage regulator circuit;
a low distortion, frequency stable 1.26 MHz oscillator circuit having amplitude feedback for providing amplitude stability;
a power splitter circuit coupled between said voltage regulator circuit and said low distortion, frequency stable oscillator circuit;
a bridge circuit including a test probe input terminal;
a buffer and driver circuit coupled between said low distortion, frequency stable oscillator circuit and said bridge circuit;
a differential amplifier circuit;
a detector circuit having peak detectors with thermo-tracking, said detector circuit coupled between said differential amplifier circuit and said bridge circuit; and
,an automatic calibration and readout circuit coupled to said differential amplifier circuit.
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Abstract
A system for measuring the cladding thickness on aluminum sheets which includes a cylindrical probe holder with four evenly spaced contact points surrounding a low temperature coefficient torroidal ferrite core which provides a signal to an aluminum cladding thickness signal processing circuit comprising a crystal oscillator, low drift detector, and push button calibration instrument portion thereby enabling drift free repeatable measurements.
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Citations
2 Claims
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1. A cladding thickness measuring signal processing circuit comprising in combination:
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a power supply circuit coupled to a voltage regulator circuit; a low distortion, frequency stable 1.26 MHz oscillator circuit having amplitude feedback for providing amplitude stability; a power splitter circuit coupled between said voltage regulator circuit and said low distortion, frequency stable oscillator circuit; a bridge circuit including a test probe input terminal; a buffer and driver circuit coupled between said low distortion, frequency stable oscillator circuit and said bridge circuit; a differential amplifier circuit; a detector circuit having peak detectors with thermo-tracking, said detector circuit coupled between said differential amplifier circuit and said bridge circuit; and
,an automatic calibration and readout circuit coupled to said differential amplifier circuit. - View Dependent Claims (2)
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Specification
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Current AssigneeThe Boeing Co.
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Original AssigneeThe Boeing Co.
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InventorsChau, Albert W., Geithman, Glenn A.
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Primary Examiner(s)Strecker, Gerard R.
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Assistant Examiner(s)Snow, Walter E.
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Application NumberUS06/530,447Time in Patent Office859 DaysField of Search324/229, 324/230, 324/231, 324/202, 324/238, 324/225, 324/236US Class Current324/230CPC Class CodesG01B 7/105 for measuring thickness of ...
