JPS57125304A - Device for checking surface of cylindrical body - Google Patents
Device for checking surface of cylindrical bodyInfo
- Publication number
- JPS57125304A JPS57125304A JP963781A JP963781A JPS57125304A JP S57125304 A JPS57125304 A JP S57125304A JP 963781 A JP963781 A JP 963781A JP 963781 A JP963781 A JP 963781A JP S57125304 A JPS57125304 A JP S57125304A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- inputted
- minimum value
- signals
- parts
- 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.)
- Granted
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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
- G01B11/303—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces using photoelectric detection means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
PURPOSE:To implement the high speed checking processing by comparing the minimum value of the interval between the pulses of a binary coded signal of a sensor output based on the reflected light from the surface to be checked with a specified threshold value. CONSTITUTION:The reflected light from the rotating surface to be checked having seamed parts is detected by a fiber sensor 601. The output thereof is guided to polarity discriminating circuits 606-608 through BPFs 603-605 having different cut off frequencies, and only one polarity is extracted. The signals are compared with a specified DC level in comparators 609-611, coded to the binary signals, and inputted to preprocessing circuits 612-614. Parts of the signals are directly inputted to a pulse interval measuring circuit 616, the other parts are inputted to the circuit 616 through an OR circuit 615, and the pulse interval is obtained. The signal from the circuit 616 is inputted to a minimum value detecting circuit 617, and the minimum value of the pulse interval is compared with the threshold value in a judging circuit 618. If the signal is small, it is determined that the product is defective. Thus the high speed checking process can be implemented by the inexpensive means.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP963781A JPS57125304A (en) | 1981-01-27 | 1981-01-27 | Device for checking surface of cylindrical body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP963781A JPS57125304A (en) | 1981-01-27 | 1981-01-27 | Device for checking surface of cylindrical body |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57125304A true JPS57125304A (en) | 1982-08-04 |
JPS6355656B2 JPS6355656B2 (en) | 1988-11-04 |
Family
ID=11725738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP963781A Granted JPS57125304A (en) | 1981-01-27 | 1981-01-27 | Device for checking surface of cylindrical body |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57125304A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61172006A (en) * | 1985-01-25 | 1986-08-02 | Nippon Steel Corp | Welded step meter of pipe seam part |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5554341A (en) * | 1978-10-02 | 1980-04-21 | Eastman Kodak Co | Composition and photograph factor containg it |
-
1981
- 1981-01-27 JP JP963781A patent/JPS57125304A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5554341A (en) * | 1978-10-02 | 1980-04-21 | Eastman Kodak Co | Composition and photograph factor containg it |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61172006A (en) * | 1985-01-25 | 1986-08-02 | Nippon Steel Corp | Welded step meter of pipe seam part |
JPH0372926B2 (en) * | 1985-01-25 | 1991-11-20 | Nippon Steel Corp |
Also Published As
Publication number | Publication date |
---|---|
JPS6355656B2 (en) | 1988-11-04 |
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