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Distance and orientation measurement of an object

An object and distance technology, applied in the field of measurement using optical fiber displacement sensors, can solve the problems of imaging head alignment deviation, optical fiber sensor error, affecting the distance measurement of the medium to the sensor, etc.

Inactive Publication Date: 2011-02-23
EASTMAN KODAK CO
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  • Application Information

AI Technical Summary

Problems solved by technology

In those cases, errors in fiber optic sensors caused by changes in the orientation or shape of the medium become a serious disadvantage of the measurement sensor
In addition, misalignment of the imaging head, or changes in the eccentricity of the sleeve or drum also affect the media-to-sensor distance measurement

Method used

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  • Distance and orientation measurement of an object
  • Distance and orientation measurement of an object
  • Distance and orientation measurement of an object

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Experimental program
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Embodiment Construction

[0020] Figures 2A-2C is a schematic diagram of an optical fiber displacement device according to the invention, generally designated by the numeral 10 . Fiber optic displacement device 10 includes a signal generator 205 that generates control signals 215 and 220 for providing optical modulation of light source 230 and light source 240 . Optical fibers 235 and 245 conduct light from light sources 230 and 240, respectively. A lens is used to focus the light beams from the optical fibers 235 and 240 onto the medium 256 and the light sensor 270 measures the reflected light from the medium 256 through the lens 250 and the optical fiber 260 . The collection circuit 210 collects the reflected light passing through the light sensor 270 and analyzes it. Sensor configurations may include more than two launch fibers and a single light sensor 270 .

[0021] Signal generator 205 issues control signals 215 and 220 for light sources 230 and 240, respectively. For example, a laser diode c...

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Abstract

A method for measuring a distance between an object (256) and a light source (230) and sensing an object orientation includes applying light from a plurality of sources (230, 240 or 810) on the object; detecting a reflected energy (270) level from an object; measuring the reflected energy level from the object; computing a distance calibration function; determining at least one measuring range (301) indicated by a minimum value (302) and a maximum value (304) within the distance calibration function; computing an angle calibration function indicating energy level relation sampled at predetermined time slots within periods of a modulation function; and modulating each of the plurality of light sources with the modulation function (435, 445) such that a total energy applied from the plurality of light sources on the object during the time of the light emission is represented by a light emission predetermined function.

Description

technical field [0001] The present invention relates to an optical sensor and method for non-contact measurement of the distance and orientation of a surface, and more particularly to a method of measurement using a fiber optic displacement sensor. Background technique [0002] Non-contact distance measurement is widely used in industry. Depending on the application, different techniques are required. Techniques such as laser triangulation, confocal, fiber-based, interferometer and chromatographic techniques are common in the field of distance or displacement measurement and are implemented using optical methods. Each technology is chosen to suit specific application requirements. For example, some computer-to-plate (CTP) imaging machines use the principle of laser triangulation in order to focus the imaging head. One of the disadvantages of such sensing devices is the relatively high cost and form factor aspects, which place great constraints on the imaging head design. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/87G01S17/08G01S17/875
CPCG01S17/08G01S17/875G01B11/26G01B11/002G01B11/026
Inventor V·博卡托夫斯基
Owner EASTMAN KODAK CO
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