Non-contact non-invasive measuring method and apparatus

• US 6,084,676 A
• Filed: 10/29/1998
• Issued: 07/04/2000
• Est. Priority Date: 11/21/1997
• Status: Expired due to Fees

• Current Assignee: Kurashiki Boseki Kabushiki Kaisha, Kyoto Daiichi Kagaku Company Limited
• Original Assignee: Kurashiki Boseki Kabushiki Kaisha, Kyoto Daiichi Kagaku Company Limited
• Inventors: Kexin, Xu
• Primary Examiner(s): Font, Frank G.
• Assistant Examiner(s): Punnoose, Roy M.
• Application Number:
  US09/181,635
• Time in Patent Office: 614 Days
• Field of Search: 356/375, 356/376, 356/39, 356/41, 128/633, 128/634, 128/637, 128/644, 128/666, 128/667, 600/322
• US Class Current: 356/623
• CPC Class Codes: A61B 5/0073 by tomography, i.e. reconstruction of 3D images from 2D projections A61B5/0066 takes precedence

Abstract

The distance between an image indicating a measured portion and a measuring apparatus is previously registered, a measured object is arranged in a prescribed space in a non-contact state, the position of a probe is so adjusted that two-dimensional image sensing means senses the previously registered image of the measured portion, the position of the probe is so adjusted that the distance up to the measured portion by distance measuring means reaches the previously registered distance, and orientation determination means irradiates the measured portion with a light beam while changing the orientation for determining an orientation maximizing the quantity of light transmitted through the measured portion. Thereafter the physical quantity measuring apparatus irradiates the measured portion with measuring light and senses output light from the measured portion for obtaining a physical quantity.

Claims

1. A non-contact non-invasive measuring method for measurements by previously registering an image indicating a measured portion, the distance between said measured portion and a physical quantity measuring apparatus, and the orientation of said physical quantity measuring apparatus with respect to said measured portion in measurement, and determining the position and the orientation of said physical quantity measuring apparatus through steps of:

(A) arranging a measured object in a prescribed space in a non-contact state while arranging positioning means on a sensing position of a probe for sensing said previously registered image of said measured portion with said positioning means and adjusting the position of said probe so that the position of sensed said image coincides with that of said registered image;

(B) arranging distance measuring means on said sensing position of said probe and adjusting the position of said probe so that the distance up to said measured portion reaches said previously registered distance;

(C) arranging orientation determination means on said sensing position of said probe and determining such a sensing position that said measured portion is in said previously registered orientation; and

(D) thereafter arranging said physical quantity measuring apparatus on said sensing position of said probe, moving the same to said position determined by said orientation determination means, thereafter irradiating said measured portion with measuring light from said physical quantity measuring apparatus and sensing output light from said measured portion thereby obtaining a physical quantity.

2. The non-contact non-invasive measuring method in accordance with claim 1, wherein

said probe is in the form of a ring so that said measured portion is arranged at the center of said probe, and said previously registered distance up to said measured portion in said step (B) is set equal to the radius of said ring forming said probe.

3. The non-contact non-invasive measuring method in accordance with claim 1, wherein

said step (A) includes a step of positioning said measured object with a preliminary positioning apparatus and thereafter removing said preliminary positioning apparatus thereby arranging said measured object in said prescribed space in a non-contact state.

4. The non-contact non-invasive measuring method in accordance with claim 1, repeating an operation of determining the position and the orientation of said physical quantity measuring apparatus for measuring said physical quantity a plurality of times.

5. A measuring apparatus comprising.

a probe in the form of a ring being set around a space where a measured portion is arranged in a non-contact state;

a support mechanism supporting said probe to be movable in X-, Y- and Z-axis directions assuming that a single plane perpendicularly intersecting with the plane of said ring through the center of said probe is an X-Y plane and an axis perpendicularly intersecting with said X-Y plane through the center of said probe is a Z-axis while rotatably supporting said probe in a plane including said ring;

sensors including positioning means, distance measuring means, orientation determination means and a physical quantity measuring apparatus being arranged along said ring of said probe and mounted inward;

a position control part storing the position of an image indicating said measured portion, the distance between said measured portion and a sensing position located on the intersection point between said ring and said Z-axis in measurement, and the orientation of said physical quantity measuring apparatus with respect to said measured portion in measurement for arranging said positioning means on said sensing position with respect to a measured object being arranged in a prescribed space in a non-contact state, and adjusting the position of said probe by controlling said support mechanism in said X- and Y-axis directions when said positioning means senses a previously registered image of said measured portion so that the position of said sensed image coincides with that of said registered image, arranging said distance measuring means on said sensing position, adjusting the position of said probe by controlling said support mechanism in said Z-axis direction so that said distance up to said measured portion sensed by said distance measuring means reaches a previously registered distance, arranging said orientation determination means on said sensing position, determining such a position that said measured portion sensed by said orientation determination means is in a previously registered orientation, arranging said physical quantity measuring apparatus on said sensing position and moving the same to said position determined by said orientation determination means; and

a data processor calculating a physical quantity from a sensing signal of said physical quantity measuring apparatus positioned by said position control part.

6. The measuring apparatus in accordance with claim 5, wherein

said positioning means is a two-dimensional image sensor.

7. The measuring apparatus in accordance with claim 5, wherein

said distance measuring means comprises a first light beam irradiation optical system for irradiating said measured object with a light beam, a position sensing device receiving said light beam reflected by said measured object, and a photoreceptor optical system for condensing said light beam reflected by said measured object on said position sensitive device, for sensing the distance between said sensing position and said measured object on the basis of a condensing position on said position sensitive device.

8. The measuring apparatus in accordance with claim 5, wherein

said orientation determination means is provided with a second light beam irradiation optical system for irradiating said measured object with a light beam while changing the orientation and a photoreceptor part, for sensing said light beam transmitted through said measured object, and determining an incident angle of measuring light for measuring said physical quantity by the intensity of transmitted light sensed by said photoreceptor part or a differential value thereof.

9. The measuring apparatus in accordance with claim 5, further comprising a detachable temporary direction determining apparatus for preliminarily determining the position and direction for arranging said measured object in said prescribed space.

10. The measuring apparatus in accordance with claim 5, wherein

said position control part comprises a program for executing a function for positioning said probe.

11. The measuring apparatus in accordance with claim 5, wherein

said position control part is adapted to repeat a program for positioning said probe in every physical quantity measurement for measuring said physical quantity a plurality of times.