GB557358A - Method and apparatus for measuring the amount of coating material applied to a surface - Google Patents

Method and apparatus for measuring the amount of coating material applied to a surface

Info

Publication number
GB557358A
GB557358A GB492042A GB492042A GB557358A GB 557358 A GB557358 A GB 557358A GB 492042 A GB492042 A GB 492042A GB 492042 A GB492042 A GB 492042A GB 557358 A GB557358 A GB 557358A
Authority
GB
United Kingdom
Prior art keywords
glue
coating
electrodes
coating material
bore
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
GB492042A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB492042A priority Critical patent/GB557358A/en
Publication of GB557358A publication Critical patent/GB557358A/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
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

557,358. Determining dimensions of materials. BRUYNE, N. A. DE. April 14, 1942, No. 4920. [Class 37] The amount of glue or other coating material per unit area of coated surface is measured by applying at least one pair of electrodes to the coating and by means of a bridge circuit comparing an electrical characteristic of the coating material between the electrodes with the corresponding characteristic of a predetermined amount of the coating material. Apparatus for determining the thickness of a coating of glue on veneer in the manufacture of plywood by measuring the resistance of the coating comprises two cylindrical copper electrodes I.O., Fig. 2, spaced apart concentrically by insulating spacers S, the outer cylinder being attached to an insulating base. The lower ends af the cylinders are in one plane so that when in position on a glue-coated veneer they make uniform contact therewith. The upper ends of the cylinders are provided with terminals by which the coating between the cylinders is connected in one arm of a Wheatstone bridge. The comparison cell, Fig. 3, comprises a glass base G and an upright portion having a transverse bore H extending therethrough from end to end, a central vertical bore V passing into the transverse bore, and a smaller vertical bore V on each side of the bore V. The ends of the transverse bore H are closed by plugs P, the central vertical bore V enabling the transverse bore to be filled with glue. The bores v receive the ends of wire leads W forming electrodes which connect the coating material in the cell into an arm of the Wheatstone bridge. The bridge is supplied with an alternating current to avoid polarization effects, and is balanced by moving a sliding contact along a resistance provided with a scale indicating the amount of glue per unit area or the thickness of the layer. The various elements may be assembled in a common case to which numbers of pairs of electrodes as shown in Fig. 2 connected in parallel are fitted as feet. A valve amplifier may be inserted in the bridge circuit in place of the galvanometer and the null point determined by means of a small cathode-ray tube.
GB492042A 1942-04-14 1942-04-14 Method and apparatus for measuring the amount of coating material applied to a surface Expired GB557358A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB492042A GB557358A (en) 1942-04-14 1942-04-14 Method and apparatus for measuring the amount of coating material applied to a surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB492042A GB557358A (en) 1942-04-14 1942-04-14 Method and apparatus for measuring the amount of coating material applied to a surface

Publications (1)

Publication Number Publication Date
GB557358A true GB557358A (en) 1943-11-17

Family

ID=9786354

Family Applications (1)

Application Number Title Priority Date Filing Date
GB492042A Expired GB557358A (en) 1942-04-14 1942-04-14 Method and apparatus for measuring the amount of coating material applied to a surface

Country Status (1)

Country Link
GB (1) GB557358A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101769713B (en) * 2008-12-29 2013-05-01 天津普林电路股份有限公司 Internal resistance detection method of internal layer line layer copper thickness in multi-layer printing circuit board

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101769713B (en) * 2008-12-29 2013-05-01 天津普林电路股份有限公司 Internal resistance detection method of internal layer line layer copper thickness in multi-layer printing circuit board

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