EP0206735A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Coating weight and thickness gauges
Assignee: BOYLE CONTROLS Ltd
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Filing: 1986-06-17
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Granted: —
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Expires: 2006-06-17
Abstract
Abstract An apparatus for measuring the weight, thickness or composition of a coating or coatings applied to a substrate includes a primary radiation source (11), a detector means (10), and means (6) for processing radiation reflected by the coating or coatings. The source of primary radiation delivers an output which is applied to the coating or coatings and the detector means (10) receives the reflected secondary radiation, the detector means (10) including at least two energy-sensitive or energy-dependent detectors comprising ionisation chambers (12, 13) fitted with energy-sensitive radiation filters (14, 15) able to differentiate between different elements of the coating or coatings from one another, the outputs of the chambers (12, 13) being processed by the processing means to provide an indication of the weight or thickness of the or each coating irrespective of composition, or of the composition of the coating or coatings. The filters (14, 15) are preferably absorption-edge filters and the source of primary radiation (11) may be either an X-ray generator or a radio-isotope producing Gamma radiation. The absorption of the radiation filters (14, 15) fitted to the ionisation chambers (12, 13) is selected so as to pass the reflected secondary radiation in accordance with the materials being subjected to the primary radiation from the source (11).
Inventors
- 👤 Thomas Robert Woodruff
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 20:58
CPC Classifications
G; G01; G01B; G01B15/00; G01B15/02; G01G; G01G9/00; G01G9/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
An apparatus for measuring the weight and thickness of a coating or coatings applied to a substrate or the thickness of the substrate, including a primary radiation source, a detector means, a means for processing radiation reflected by the coating or coatings or the substrate, characterised in that a source of primary radiation (11) is provided, the output of which is applied to the coating or coatings and the substrate and means (10) are provided for detecting the reflected secondary radiation, including at least two energy-sensitive or energy-dependent detectors comprising ionisation chambers (12, 13) fitted with energy-sensitive radiation filters (14, 15), the outputs of the chambers (12, 13) _being connected to means (6) for processing the outputs to provide an indication of the weight and thickness of the coating or coatings or the weight of the substrate.
Claim 2
Independent Claim
137 words
An apparatus for measuring the weight and thickness of a coating or coatings applied to a substrate or the thickness of the substrate, including a primary radiation source, a detector means, a means for processing radiation reflected by the coating or coatings or the substrate, characterised in that a source of primary radiation (11) is provided, the output of which is applied to the coating or coatings and the substrate and means (10) are provided for detecting the reflected secondary radiation, including at least two energy-sensitive or energy-dependent detectors comprising ionisation chambers (12, 13) fitted with energy-sensitive radiation filters (14, 15), the outputs of the chambers (12, 13) _being connected to means (6) for processing the outputs to provide an indication of the weight and thickness of the coating or coatings or the weight of the substrate.
Claim 3
Dependent Claim
21 words
Apparatus according to Claim 1 characterised in that the ionisation chambers (12, 13) are provided with absorption edge filters (14, 15).
Claim 4
Dependent Claim
46 words
Apparatus according to Claim 2, characterised in that the absorption filters (14, 15) provided on each of the ionisation chambers (12, 13) are absorption edge filters which are different from each other and whereby the different components of a coating can be differentiated from one another.
Claim 5
Dependent Claim
34 words
Apparatus according to any one of Claims 1 to 3, characterised in that the ionisation chambers (12, 13) are contained in a common housing (10) which also incorporates the source of primary radiation (11).
Claim 6
Dependent Claim
111 words
Apparatus according to any one of the preceding Claims characterised in that the apparatus comprises a frame (1) which encircles the substrate, the frame supporting measuring heads (2, 3) which can be positioned in selected locations with respect to the substrate and a calibration unit (5) is provided in association with the frame, the position of the measuring heads being controlled by the calibration unit and each measuring head including a source of primary radiation (11) and a differential energy-sensitive or energy-dependent detector (10) incorporating ionisation chambers (12, 13) fitted with energy-sensitive radiation filters (14, 15), which generates output signals each of which is related to a different reflective radiation measurement.
Claim 7
Dependent Claim
37 words
Apparatus according to Claim 1 or Claim 5, characterised in that the outputs of the chambers (12, 13) are connected to the inputs (18, 19) of a processing unit (6) having means to indicate the processed measurements.
Claim 8
Dependent Claim
83 words
Apparatus according to any one of the preceding Claims, characterised in that each ionisation chamber (12, 13) has a gas-filled chamber containing polarised electros, a pair of said chambers (12, 13) being arranged in an annular form in a housing around the source of primary radiation (11), the absorption of the radiation filters (14, 15) fitted to the ionisation chambers (12, 13) being selected to pass the reflected secondary radiation in accordance with the materials being subjected to the primary radiation source (11).
Claim 9
Dependent Claim
27 words
Apparatus according to any one of Claims 1 to 7, characterised in that the source of primary radiation (11) is either an X-ray generator or a radio-isotope.
Claim 10
Independent Claim
110 words
A method of measuring the weight and thickness of a coating or coatings applied to a substrate or the thickness of the substrate, characterised in that the method comprises subjecting the coating or coatings or the substrate to radiation of a primary source (11), reflecting the secondary radiation from the coating or coatings or the substrate to energy-sensitive or energy-dependent detector means, including ionisation chambers (12, 13) through selected energy-sensitive radiation filters (14, 15), the outputs of the ionisation chambers (12, 13), being processed to give an indication of the individually sensed signals corresponding to the weight and thickness of a coating or coatings or the thickness of the substrate.
Claim 11
Independent Claim
110 words
A method of measuring the weight and thickness of a coating or coatings applied to a substrate or the thickness of the substrate, characterised in that the method comprises subjecting the coating or coatings or the substrate to radiation of a primary source (11), reflecting the secondary radiation from the coating or coatings or the substrate to energy-sensitive or energy-dependent detector means, including ionisation chambers (12, 13) through selected energy-sensitive radiation filters (14, 15), the outputs of the ionisation chambers (12, 13), being processed to give an indication of the individually sensed signals corresponding to the weight and thickness of a coating or coatings or the thickness of the substrate.
References Cited (Backward Citations)
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