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1. 发明专利

DE1573401C3 未知
公开(公告)号：DE1573401C3
公开(公告)日：1975-01-30
申请号：DE1573401
申请日：1966-07-20
申请人： AUTOMATION INDUSTRIES INC., LOS ANGELES, CALIF. (V.ST.A.)
发明人： MALEY, DALE RAYMOND, BOULDER, COL. (V.ST.A.)
IPC分类号： G01N25/72 , G01N21/32
摘要： 1,151,082. Testing workpieces photoelectrically. AUTOMATION INDUSTRIES Inc. June 21, 1966 [July 26, 1965], No.27718/66. Heading G1A. In a device for detecting flaws in workpieces by heating them and scanning them photo-electrically to detect hot or cold spots, the effect of emissivity variations is minimized by measuring the radiation intensities in two wavelength bands and determining the ratio between them. In a first embodiment, Fig. 1, a small spot 28 on a workpiece 18 is heated by a filament lamp 20, and the workpiece is moved in such a way that radiometers 30, 32 view the spot 28 a predetermined time after heating. The radio-meters view the spot 28 through different filters 44, 46 and the ratio of their output signals is derived by a comparator 48 and displayed on a metor 62 or an oscilloscope 60. Voids, inclusions and variations of thickness show up as hot or cold spots on the oscilloscope 60. The oscilloscope may be photographed and the ratio signal may be used to sound an alarm or operate means to sort the workpieces. In a second embodiment, Fig. 4 (not shown) the two radio -meters are replaced by a single radiometer in front of which a sectored filter disc rotates and the signals corresponding to the two wavebands are separated by a synchronous switch before application to the comparator. The radiometers of both embodiments include chopping wheels to modulate the radiation and permit the use of A. C. circuitry.

2. 发明专利

DE1573401B2 未知
公开(公告)号：DE1573401B2
公开(公告)日：1974-06-12
申请号：DE1573401
申请日：1966-07-20
申请人： AUTOMATION INDUSTRIES INC., LOS ANGELES, CALIF. (V.ST.A.)
发明人： MALEY, DALE RAYMOND, BOULDER, COL. (V.ST.A.)
IPC分类号： G01N25/72 , G01N21/32
摘要： 1,151,082. Testing workpieces photoelectrically. AUTOMATION INDUSTRIES Inc. June 21, 1966 [July 26, 1965], No.27718/66. Heading G1A. In a device for detecting flaws in workpieces by heating them and scanning them photo-electrically to detect hot or cold spots, the effect of emissivity variations is minimized by measuring the radiation intensities in two wavelength bands and determining the ratio between them. In a first embodiment, Fig. 1, a small spot 28 on a workpiece 18 is heated by a filament lamp 20, and the workpiece is moved in such a way that radiometers 30, 32 view the spot 28 a predetermined time after heating. The radio-meters view the spot 28 through different filters 44, 46 and the ratio of their output signals is derived by a comparator 48 and displayed on a metor 62 or an oscilloscope 60. Voids, inclusions and variations of thickness show up as hot or cold spots on the oscilloscope 60. The oscilloscope may be photographed and the ratio signal may be used to sound an alarm or operate means to sort the workpieces. In a second embodiment, Fig. 4 (not shown) the two radio -meters are replaced by a single radiometer in front of which a sectored filter disc rotates and the signals corresponding to the two wavebands are separated by a synchronous switch before application to the comparator. The radiometers of both embodiments include chopping wheels to modulate the radiation and permit the use of A. C. circuitry.

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