Method and apparatus to measure amount of movement using granular speck pattern generated by reflecting laser beam
AssigneeKabushiki Kaisha Toyoseikiseisakusho
InventorKenichiro Kobayashi
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Abstract
A granular speck pattern is generated by a reflecting laser beam as an object to be measured is irradiated with a laser beam. This granular speck pattern is directly picked up as image index by a line sensor. An A/D converter converts an analog signal supplied from the line sensor to a digital signal, a processing unit calculates the amount of movement of the object on the basis of movement of a pixel interval of the granular speck pattern. A display device displays the amount of movement calculated by said processing unit.
Claims24
A method for measuring the amount which an object to be measured has moved using a granular speck pattern generated by a reflecting laser beam in non-contact fashion comprising steps of:
- irradiating an object to be measured with a laser beam;
- directly detecting the granular speck pattern generated by the laser beam by a detector in an environment, the environment not being a darkroom, and using the detected speck pattern as an index;
- calculating the amount of movement of the object based upon the movement of a new granular speck pattern corresponding to the moved position of the object with respect to said index;
- and
- displaying a result of the calculation as a numerical value of the measured amount of movement.
An apparatus for measuring the amount which an object to be measured has moved using a granular speck pattern generated by a reflecting laser beam, said apparatus comprising:
- a laser projector to generate a granular speck pattern corresponding to a rough surface of an object to be measured;
- a line sensor to directly pick up said granular speck pattern used as an index;
- an A/D converter coupled to said line sensor to convert an analog signal supplied from said line sensor to a digital signal;
- a processing unit coupled to the A/D converter to calculate the amount of movement of said object on the basis of movement of a granular speck in said granular speck pattern with respect to a change in a pixel interval of said granular speck pattern picked up by said line sensor and represented by said A/D converted digital signal;
- and
- a display coupled to said processing unit to display the amount of movement calculated by said processing unit;
- wherein the line sensor is able to directly pick up the granular speck pattern in an environment that is not a darkroom.
An apparatus for measuring the amount which an object to be measured has moved using a granular speck pattern generated by a reflecting laser beam, said apparatus comprising:
- a laser projector for generating a granular speck pattern corresponding to the surface of an object to be measured;
- a line sensor positioned to detect directly said granular speck pattern as an index;
- and an electrical circuit coupled to said line sensor for calculating the amount of movement of said object on the basis of movement of a granular speck in said granular speck pattern with respect to a pixel interval of said granular speck pattern picked up by said line sensor and displaying the amount of movement calculated by said electrical circuit;
- wherein the line sensor is able to directly pick up the granular speck pattern in an environment that is not a darkroom.
A method for measuring the amount which an object to be measured has moved by detecting a granular speck pattern reflected by a laser beam comprising steps of:
- irradiating an object to be measured with a laser beam;
- directly detecting a granular speck pattern generated by the laser beam by a detector in an environment, the environment not being a darkroom, and using the detected pattern as an index;
- moving the object with respect to said detector;
- calculating the amount of movement of the object based upon movement of the granular speck pattern corresponding to the moved position of the object with respect to said index;
- and displaying a result of the calculation as a numerical value of the measured amount of movement.
An apparatus for measuring the amount which an object to be measured has moved using a granular speck pattern generated by a reflecting laser beam, said apparatus comprising:
- a laser source for generating a granular speck pattern corresponding to a rough surface of an object to be measured;
- a line sensor positioned to detect directly said granular speck pattern as an index;
- a processing unit coupled to said line sensor to calculate the amount of movement of said object on the basis of movement of a granular speck in said granular speck pattern with respect to a pixel interval of said granular speck pattern detected by said line sensor;
- and
- a display coupled to said processing unit to display the amount of movement calculated by said processing unit;
- wherein the line sensor is able to directly pick up the granular speck pattern in an environment that is not a darkroom.
An apparatus for measuring the amount which an object to be measured has moved using a granular speck pattern generated by a reflecting laser beam, said apparatus comprising:
- a collimated light source for generating a granular speck pattern corresponding to the surface of an object to be measured;
- a line sensor positioned to detect directly said granular speck pattern as an index;
- and an electrical circuit coupled to said line sensor for calculating the amount of movement of said object on the basis of movement of a granular speck in said granular speck pattern with respect to a pixel interval of said granular speck pattern picked up by said line sensor and displaying the amount of movement calculated by said electrical circuit;
- wherein the line sensor is able to directly pick up the granular speck pattern in an environment that is not a darkroom.
Dependencies are inferred from the claim text.