JPS5487285A - Automatic tester for porous shielding plate - Google Patents

Automatic tester for porous shielding plate

Info

Publication number
JPS5487285A
JPS5487285A JP15523677A JP15523677A JPS5487285A JP S5487285 A JPS5487285 A JP S5487285A JP 15523677 A JP15523677 A JP 15523677A JP 15523677 A JP15523677 A JP 15523677A JP S5487285 A JPS5487285 A JP S5487285A
Authority
JP
Japan
Prior art keywords
shielding plate
unit
signals
pores
logic
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.)
Pending
Application number
JP15523677A
Other languages
Japanese (ja)
Inventor
Koichi Kawada
Masayuki Naruse
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15523677A priority Critical patent/JPS5487285A/en
Publication of JPS5487285A publication Critical patent/JPS5487285A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/59—Transmissivity
    • G01N21/5907—Densitometers
    • G01N21/5911—Densitometers of the scanning type

Abstract

PURPOSE:To automatically judge the clogging and deformation of the pores of a porous shielding plate thereby to make the completely automatic tests possible by moving the shielding plate. CONSTITUTION:A porous shielding plate 1, which is set on a carraige 4 made movable in a horizontal direction X, is irradiated vertically with the parallel beam from an illuminating unit which is composed of a light source 6 and a lens 5. The light having passed through the pores 2 of the shielding plate 1 forms a shadow image upon a photoelectric detecting unit 9, which includes a one-dimentional photoelectric scanner having a size in a vertical direction W, and the shadow image is converted into electric signals. These analog signals are converted by a binary circuit 10 into white image signals of logic 1 and black image signals of logic 0. A calculating unit 12 counts the number of 1 and 0 for each bit unit and compares it with the value of a memory unit 13. Since the compared values fail to coincide in case the pore get clogged or deformed, a warning is displayed in a display unit 14 to inform the operator of the test results.
JP15523677A 1977-12-22 1977-12-22 Automatic tester for porous shielding plate Pending JPS5487285A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15523677A JPS5487285A (en) 1977-12-22 1977-12-22 Automatic tester for porous shielding plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15523677A JPS5487285A (en) 1977-12-22 1977-12-22 Automatic tester for porous shielding plate

Publications (1)

Publication Number Publication Date
JPS5487285A true JPS5487285A (en) 1979-07-11

Family

ID=15601502

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15523677A Pending JPS5487285A (en) 1977-12-22 1977-12-22 Automatic tester for porous shielding plate

Country Status (1)

Country Link
JP (1) JPS5487285A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58155343A (en) * 1982-03-12 1983-09-16 Katsuya Yamada Method for inspecting orifice wall of honeycomb like matter
JPS62100093A (en) * 1985-10-26 1987-05-09 Fuji Electric Co Ltd Processing device for serial data
JPH0510720A (en) * 1991-06-28 1993-01-19 Dainippon Screen Mfg Co Ltd Through-hole size measuring method and apparatus
JP2008170197A (en) * 2007-01-10 2008-07-24 Toyama Sumitomo Denko Kk Foreign matter detector for metal porous object, and metal porous object through foreign matter detection process

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58155343A (en) * 1982-03-12 1983-09-16 Katsuya Yamada Method for inspecting orifice wall of honeycomb like matter
JPS62100093A (en) * 1985-10-26 1987-05-09 Fuji Electric Co Ltd Processing device for serial data
JPH0510720A (en) * 1991-06-28 1993-01-19 Dainippon Screen Mfg Co Ltd Through-hole size measuring method and apparatus
JP2008170197A (en) * 2007-01-10 2008-07-24 Toyama Sumitomo Denko Kk Foreign matter detector for metal porous object, and metal porous object through foreign matter detection process

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