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Photo-Optic Intensity Differential Analyzer With Digital Display

IP.com Disclosure Number: IPCOM000042378D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Cornwell, JH: AUTHOR [+2]

Abstract

The photo-optic intensity differential analyser uses a laser scanner 10 as a light source mounted in a fixed position and an optical sensor 20 having two photocells 21 and 22 offset from each other in a vertical plane (Figs. 1, 2 and 3). The offset, in this example, is .0001 inch. The sensor 20 is mounted to be moveable relative to the laser 10, and after the sensor 20 has been calibrated with respect to the laser 10, changes in elevation and attitude can be detected through the facility of a differential circuit 30 connected to the outputs of the phototransistors 21 and 22. The output of the differentiating circuit 30 is applied to a digital display 40 to provide a + or - reading in microinches. The photo-optic intensity differential analyzer finds particular utility in measuring flatness and parallelism of machine tool ways.

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Photo-Optic Intensity Differential Analyzer With Digital Display

The photo-optic intensity differential analyser uses a laser scanner 10 as a light source mounted in a fixed position and an optical sensor 20 having two photocells 21 and 22 offset from each other in a vertical plane (Figs. 1, 2 and 3). The offset, in this example, is .0001 inch. The sensor 20 is mounted to be moveable relative to the laser 10, and after the sensor 20 has been calibrated with respect to the laser 10, changes in elevation and attitude can be detected through the facility of a differential circuit 30 connected to the outputs of the phototransistors 21 and 22. The output of the differentiating circuit 30 is applied to a digital display 40 to provide a + or - reading in microinches. The photo-optic intensity differential analyzer finds particular utility in measuring flatness and parallelism of machine tool ways. Once the measurements are made, then the ways can be scraped and new measurements can be made and the scraping process repeated until the flatness and parallelness of the ways are within the desired tolerance. Prior to making the measurement, the laser scanner 10 (Fig.
1) is mounted on a surface plate (not shown) and the photodetector 20 is also positioned on the surface plate so that the beam 11, which sweeps horizontally, impinges upon the photocells 21 and 22, as in Fig. 2. Potentiometers for the differentiating circuit 30 (Fig. 3) are adjusted so that there is a zero readi...