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| Number | Title | Issue Date |
| 4172994 | Electro-optic apparatus for measuring the speed of angular rotation of one body relative another using moire patterns Apparatus for measuring the speed of rotation of a wheel or the angular orientation thereof relative to a fixed point. A first portion of a transmitter unit is positioned along the periphery of the wheel and a second portion of the transmitter unit is pos... | 10/30/1979 |
| 4152837 | Length measuring device A displacement measuring system for measuring relative displacements between two members. The second member is free to move relative to the first member along a main guide. The first member has a scale element which tracks the main guide. The second membe... | 05/08/1979 |
| 4127772 | Moire optical transducer A moire optical transducer is described which has a minimal optical operating error. In normal moire grating sets, the lines of the gratings each inherently possess a periodic error in line spacing. This periodic error cannot be eliminated, but through th... | 11/28/1978 |
| 4115008 | Displacement measuring apparatus Apparatus for measuring the extent and sense of relative movement between two objects comprises a reflecting ruled grating carried on one body and optical reading head carried on the other. The reading head includes a light source arranged to produce at l... | 09/19/1978 |
| 4096384 | Position transducer for machine tools and measuring machines A position transducer for machine tools and measuring machines, arranged to measure relative displacements of a first part of the machine with respect to a second part of the machine, is described. The main feature of this position transducer is to operat... | 06/20/1978 |
| 4079252 | Photoelectric grating displacement measuring apparatus A measuring system includes a scale grating carried on one of two relatively movable bodies and an index grating carried on the other. The scale grating is illuminated directly in such a way that light passing from it to the index grating is at least part... | 03/14/1978 |
| 4078173 | Light amplitude control system for position and motion transducers An opto-electronic transducer for determining position and/or velocity of one member with respect to another member is provided with light amplitude control. The transducer is comprised of a scale with a transmission grating on a first track and an indexi... | 03/07/1978 |
| 4047586 | Zero load adjustment apparatus for spring weighing scale A spring weighing scale includes an optical detector which generates a moire fringe pattern and moves the pattern as an optically amplified function of scale tare deflection. A first of a pair of parallel optical gratings moves with a scale tare structure... | 09/13/1977 |
| 4044847 | Weighing system with a moire optoelectronic transducer A weighing scale includes an optoelectronic system having apparatus for generating a moire fringe pattern and for detecting the moving of the pattern in accordance with scale tare deflection. One of a pair of ruled parallel grating sets is fixed with resp... | 08/30/1977 |
| 4037325 | Linear glass scale height gage Apparatus for measuring which is adapted for use with a remote digital readout. The measuring apparatus includes an elongated main beam and a measuring device slidably mounted on the beam. The beam includes a transparent ruled scale with markings position... | 07/26/1977 |
| 4021116 | High resolution distance measuring apparatus A high resolution optical electronic measuring device for measuring displacement distance between an object which moves and one which is generally stationary includes apparatus for generating a series of cyclic radiation fringe patterns moving in correspo... | 05/03/1977 |
| 3957378 | Two-axis moire fringe displacement transducer A two-axis Moire fringe displacement transducer is disclosed in which the scale grating is inscribed with a grid pattern consisting of two superimposed orthogonal optical line sets and the index grating is inscribed with at least two discrete optical grat... | 05/18/1976 |
