GB710124A - Improvements in and relating to methods of measuring thickness or density of thin sheets - Google Patents

Improvements in and relating to methods of measuring thickness or density of thin sheets

Info

Publication number
GB710124A
GB710124A GB20965/51A GB2096551A GB710124A GB 710124 A GB710124 A GB 710124A GB 20965/51 A GB20965/51 A GB 20965/51A GB 2096551 A GB2096551 A GB 2096551A GB 710124 A GB710124 A GB 710124A
Authority
GB
United Kingdom
Prior art keywords
sheet
density
waves
sept
placing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB20965/51A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB710124A publication Critical patent/GB710124A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
    • G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/34—Paper
    • G01N33/346—Paper paper sheets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/023—Solids
    • G01N2291/0237—Thin materials, e.g. paper, membranes, thin films

Abstract

710,124. Testing materials by sonic or ultrasonic waves. BRITISH THOMSON-HOUSTON CO., Ltd. Sept. 5, 1951 [Sept. 22, 1950], No. 20965/51. Drawings to Specification. Class 118 (2). The density or thickness of a sheet of paper or metal foil is determined by placing it in an air space between a cone-shaped electromechanical transmitting transducer operating at a frequency of less than 40,000 c/s and a similar receiving transducer, the change in intensity or phase of. the received waves being measured. When using low frequencies, e.g. a few hundred cycles per second, the sensitivity is increased by adjusting the frequency so that resonant standing waves are produced between the transmitter and receiver before inserting the sheet midway between them. Fig. 1 (not shown). At higher frequencies, e.g. 20 kc/s, the transducers are spaced further apart and undesirable standing waves are reduced by placing the sheet obliquely to the transmission path.
GB20965/51A 1950-09-22 1951-09-05 Improvements in and relating to methods of measuring thickness or density of thin sheets Expired GB710124A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US710124XA 1950-09-22 1950-09-22

Publications (1)

Publication Number Publication Date
GB710124A true GB710124A (en) 1954-06-09

Family

ID=22098745

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20965/51A Expired GB710124A (en) 1950-09-22 1951-09-05 Improvements in and relating to methods of measuring thickness or density of thin sheets

Country Status (1)

Country Link
GB (1) GB710124A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2096782A2 (en) * 1970-06-16 1972-02-25 Zellweger Uster Ag
US3750461A (en) * 1971-06-16 1973-08-07 Zellweger Uster Ag Method of and an apparatus for determining the cross-section of products of the textile industry, especially that of yarns, rovings and slivers
FR2175817A1 (en) * 1972-03-15 1973-10-26 Zellweger Uster Ag
US3984895A (en) * 1973-11-01 1976-10-12 Fiber Controls Corporation Density sensing and controlling equipment
FR2324553A1 (en) * 1975-09-22 1977-04-15 Eastman Kodak Co METHOD AND APPARATUS FOR DETECTING THE PRESENCE OF LEAVES ON A DETERMINED TRAJECTORY
FR2476831A1 (en) * 1980-02-26 1981-08-28 Fiat Ricerche DEVICE FOR NON-DESTRUCTIVE MEASUREMENT OF THE THICKNESS OF A SURFACE LAYER OF A BODY SUBJECT TO A TREATMENT MODIFYING THE STRUCTURE OF THIS SURFACE
GB2207754A (en) * 1987-08-05 1989-02-08 Eskofot As Ultrasound detector of thin films
WO1993015008A1 (en) * 1992-01-27 1993-08-05 Beloit Technologies, Inc. Closed loop control for a web winding machine
US5661243A (en) * 1995-04-28 1997-08-26 Eastman Kodak Company Sheet material detector
EP1156328A2 (en) * 2000-05-18 2001-11-21 Eastman Kodak Company A method and apparatus for correcting for a phase shift between a transmitter and a receiver
WO2007073340A1 (en) * 2005-12-22 2007-06-28 Stora Enso Ab A method and a system for monitoring structural changes of a fiber web

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2096782A2 (en) * 1970-06-16 1972-02-25 Zellweger Uster Ag
US3750461A (en) * 1971-06-16 1973-08-07 Zellweger Uster Ag Method of and an apparatus for determining the cross-section of products of the textile industry, especially that of yarns, rovings and slivers
FR2175817A1 (en) * 1972-03-15 1973-10-26 Zellweger Uster Ag
US3854327A (en) * 1972-03-15 1974-12-17 Zellweger Uster Ag Method and apparatus for determining the cross section of material using a sound field
US3984895A (en) * 1973-11-01 1976-10-12 Fiber Controls Corporation Density sensing and controlling equipment
FR2324553A1 (en) * 1975-09-22 1977-04-15 Eastman Kodak Co METHOD AND APPARATUS FOR DETECTING THE PRESENCE OF LEAVES ON A DETERMINED TRAJECTORY
FR2476831A1 (en) * 1980-02-26 1981-08-28 Fiat Ricerche DEVICE FOR NON-DESTRUCTIVE MEASUREMENT OF THE THICKNESS OF A SURFACE LAYER OF A BODY SUBJECT TO A TREATMENT MODIFYING THE STRUCTURE OF THIS SURFACE
GB2207754A (en) * 1987-08-05 1989-02-08 Eskofot As Ultrasound detector of thin films
US5023846A (en) * 1987-08-05 1991-06-11 Eskofot A/S Ultrasonic detector for detecting a thin film
GB2207754B (en) * 1987-08-05 1991-10-09 Eskofot As Ultrasound detector of thin films
WO1993015008A1 (en) * 1992-01-27 1993-08-05 Beloit Technologies, Inc. Closed loop control for a web winding machine
US5661243A (en) * 1995-04-28 1997-08-26 Eastman Kodak Company Sheet material detector
EP1156328A2 (en) * 2000-05-18 2001-11-21 Eastman Kodak Company A method and apparatus for correcting for a phase shift between a transmitter and a receiver
EP1156328A3 (en) * 2000-05-18 2005-04-13 Eastman Kodak Company A method and apparatus for correcting for a phase shift between a transmitter and a receiver
WO2007073340A1 (en) * 2005-12-22 2007-06-28 Stora Enso Ab A method and a system for monitoring structural changes of a fiber web
US7942057B2 (en) 2005-12-22 2011-05-17 Stora Enso Ab Method and a system for monitoring structural changes of a fiber web

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