Sensing system with a multi-channel fiber optic bundle sensitive probe

• US 5,453,838 A
• Filed: 06/17/1994
• Issued: 09/26/1995
• Est. Priority Date: 06/17/1994
• Status: Expired due to Term

• Current Assignee: Biolitec Pharma Marketing Ltd.
• Original Assignee: CeramOptec Industries Incorporated (Biolitec AG)
• Inventors: Neuberger, W., Danielian, G.
• Primary Examiner(s): Pham, Hoa Q.
• Application Number:
  US08/261,676
• Time in Patent Office: 466 Days
• Field of Search: 356/371, 356/373, 356/375, 356/372, 356/445, 356/446, 250/227.11, 250/227.21, 250/227.28, 250/231.1, 250/561, 385/115, 385/116, 385/121
• US Class Current: 356/600
• CPC Class Codes: G01B 11/303 using photoelectric detection means
• CPC Class Codes: G01D 5/268 using optical fibres G01D5/28 - G01D5/38 take precedence

Abstract

A sensing system with a multichannel fiber optic bundle (MFOB) sensitive probe for measuring displacement, vibrations, roughness and two angles between a probe tip and light reflected target. The MFOB sensitive probe includes three branches of transmitting and receiving channels. The tip end of the MFOB is arranged in a rectangular 3*3 matrix formation. The other end of the MFOB includes eleven optical tips and connectors for optically connecting the tip of each channel, through optical filters, with light sensors and light sources. The sensing system further includes an electronic portion, having a thermostabilized box, an analog portion of an electronic module, a multifunction input/output board for use with a computer, and a controller for programmably controlling and measuring all parameters using computer analysis.

Claims

1. In a sensing system for simultaneously sensing at least one parameter from the group consisting of displacement, roughness and two angles between a probe tip and a light reflected target, including a fiber optic light conducting bundle having light transmitting fibers and light receiving fibers, wherein the improvement comprises:

a multichannel fiber optic bundle sensitive probe having a flat sensitive probe tip end with at least three types of transmitting and receiving ends of channels divided between three branches;

a) a first of said three branches consisting essentially of receiving fibers directed to four sections, means for symmetrically orienting the fibers within a middle point of each section, means for connecting the fibers optically with four respective light sensors;

b) a second of said three branches consisting essentially of receiving fibers collected into two sections, means for symmetrically orienting the receiving fibers around the receiving fibers of said first branch, means for connecting the fibers with two respective light sensors; and

c) a third of said three branches consisting essentially of transmitting fibers symmetrically oriented and collected in at least five separated transmitting sections and connected with between one to five light sources.

2. The sensing system and multichannel fiber optic bundle sensitive probe of claim 1, wherein the means for symmetrically orienting at the probe tip end further comprises a rectangular 3*3 matrix formation having nine sections, whereby said nine sections comprise a first end of fibers having:

a center section of transmitting fibers (12) surrounded by a first supplementary section of fibers and bundled into a first separated receiving channel (16) forming a part of the second branch (5) of the multichannel fiber optic bundle;

a plurality of supplementary sections of fibers placed internally around boundaries of the nine sections to form a collection of second separated receiving channels (15) of the second branch (5) of the multichannel fiber optic bundle;

four corner sections and the center section of the 3*3 matrix being occupied by the five separated transmitting sections (10,11,12,13,14) from the third branch (3) of the multichannel fiber optic bundle;

four middle sections of the 3*3 matrix, located between two of the respective four corners of the matrix, being occupied by receiving fibers from the four channels (6,7,8,9) of the first branch (4) of the multichannel fiber optic bundle; and

,

a second end of said fibers of said first and second separated receiving channels of said second branch being bundled into at least two separate channels and having means for optical connection to at least two light sensors;

a second end of said fibers of said four channels of said first branch having means for optical connection to light sensors, said light sensors having means for adjusting;

a second end of said fibers of said five separated transmitting sections of said third branch being bundled into between one and five transmitting channels and having means for optical connection to respective light sources.

3. The sensing system and multichannel fiber optic bundle sensitive probe of claim 2, wherein the system further comprises a thermostabilized box for housing said second end of said fibers, said box comprising a probe module with a thermosensor and at least one heating element.

4. The sensing system and multichannel fiber optic bundle sensitive probe of claim 2, wherein the system further comprises,

at least six light sensors for connection with the receiving fibers, at least six amplifiers in series with the light sensors;

at least two light sources for connection with the transmitting fibers; and

a plurality of optical filters located between the receiving fibers and the sensors, and transmitting fibers and the sources.

5. The sensing system and multichannel fiber optic bundle sensitive probe of claim 4, wherein the system further comprises an electronic module in connection with the amplifiers for analyzing and controlling amplified signals, said module comprising two summary elements, two submitting elements and two light regulators connected to the receiving channels, whereby:

said two submitting elements produce two output analog signals related to two angles between the probe tip and the reflected target;

said first summary element produces an output analog signal related to the displacement;

said second summary element produces an analog signal, free from angle and disturbance influence, related to light reflectance or the roughness of the reflected target, and

further including three zero or analog signal registrators electrically connected to outputs of said first summary element and to said two submitting elements, whereby said registrators include means for precisely adjusting zero positions in the measuring process and for working range testing in the electronic module.

6. The sensing system and multichannel fiber optic bundle sensitive probe of claim 5, wherein the system further comprises an input/output board card for a computer controller, having at least ten analog inputs for analog/digital converting and from between two to five analog outputs for digital to analog converting, said inputs being connected to said receiving channels and said outputs being connected to said transmitting channels.

7. The sensing system and multichannel fiber optic bundle sensitive probe of claim 6, wherein the system further comprises means for programmably controlling, measuring and analyzing data received from said channels.