Detector pulse enhancement circuit
US4199259A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 1977 |
| Grant date | Apr 22, 1980 |
| Priority date | — |
| Expiry date | Jun 27, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical gauging device wherein a laser beam is deflected to produce a bidirectional scan; a measuring portion of the split beam scans an object being inspected while the other portion scans a calibration reticle having alternating opaque and transparent bands. The alternating transmission and occultation of the beam through the reticle is used to generate calibration pulses, each representing a predetermined increment of movement of the calibration beam. The measuring portion of the beam is converted into parallel light beams which in turn are occulted by the workpiece being measured. A series of high and low square wave pulses are generated that are operative to start and stop the count of the calibration pulses. The count of the calibration pulses is directly related to the dimension of the workpiece being measured. A detector pulse enhancement circuit converts the measured signals to an accurate set of timing pulses independent of scan velocity, part size, part composition and interfering noise. The pulse generation utilizes a variable gain amplifier to provide a one-to-one output except upon the detection of a measuring signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.