A radial shape optical measurement method and device

Abstract

The present invention discloses an optical measurement method and device for radial shape, which is to place a sample in a sample stage of a pressure chamber, set an annular light emitting device group and an annular photosensitive sensor on the inner wall of the pressure chamber, form a shadow on the annular photosensitive sensor on the other side of the sample through the light emitted by the light emitting point on the annular light emitting device group, measure the position of the shadow demarcation point, connect all the light emitting point positions with the corresponding shadow demarcation point positions with straight lines, and the shape inscribed in these straight lines is the radial shape of the sample. The present invention has the characteristics of small error, long service life, can measure body deformation, accurate measurement, and wide application range.

Description

Technical Field

[0001] The invention relates to an optical measurement method and device, in particular to an optical measurement method and device of a radial shape. Background Art

[0002] Shape measurement is to measure the external shape of the sample, or to measure the deformation of the sample. At present, radial shape measurement mainly adopts mechanical sensor measurement and laser sensor measurement. The defects of mechanical sensor measurement are: 1. The installation position of the sensor is not fixed, the measurement result is affected by human factors, and the error is large; 2. The number of measurement points is limited, and the radial shape cannot be accurately measured; 3. The bending shape of the object to be measured cannot be measured. The defects of laser sensor measurement are: 1. Laser measurement is only point measurement, and the shape of the body cannot be measured; 2. The shape change of the sample after deformation is very small, and the laser measurement is not accurate; 3. For rock samples, the pressure chamber is made of hard steel material, and the laser cannot penetrate the pressure chamber. It is not suitable for the measurement of rock samples and has a narrow range of application. Summary of the invention

[0003] The purpose of the present invention is to provide a radial shape optical measurement method and device. The present invention has the characteristics of small error, long life, can measure body deformation, and has accurate measurement, wide application range and low cost.

[0004] The technical solution of the present invention is a radial shape optical measurement method, which is to place a sample in a sample stage of a pressure chamber, set an annular light-emitting device group and an annular photosensor on the inner wall of the pressure chamber, and form a shadow on the annular photosensor on the other side of the sample through the light emitted by the light-emitting points on the annular light-emitting device group, measure the position of the shadow dividing point, and connect all the light-emitting point positions with the corresponding shadow dividing point positions with straight lines. The shape inscribed in these straight lines is the radial shape of the sample.

[0005] The aforementioned optical measurement method of radial shape, the specific steps of the method are as follows:

[0006] 1) The light points of the ring-shaped light-emitting device group are numbered sequentially, and recorded as F1, F2, ... F i , the layers of the annular photosensors are numbered sequentially, and are recorded as G1, G2, ..., Gj;

[0007] Place the sample on the sample stage, and a certain light point F in the ring light emitting device group i The light is emitted, forming a shadow on the wall of the pressure chamber on the other side of the sample; by measuring the signal of the annular photosensor, it is determined that the left and right dividing lines between the shadow area and the light area on the j-th layer of the annular photosensor are GjY i and GjY i ', where Yi is the coordinate of the light-dark boundary point on the j-th layer of annular photosensors, and each luminous point Fi in the annular luminous particle annular luminous device group is controlled to emit light in turn, and a j-th layer annular photoreceptor measurement data set {F i , GY i};

[0008] 2) Connect all the luminous points with the corresponding light-dark dividing points by straight lines, and project the straight line set onto the plane where the corresponding luminous points are located, and obtain the straight line set {(F i , GY i )}, the point where the straight line is tangent to the sample is denoted as M FiGjYi point;

[0009] 3) For any straight line (F i , GY i ), can be found in the straight line set {(F i , GY i )}, find two perpendicular lines, the middle parallel line between these two lines and the line (F i , GY i ) is denoted as M FiGjYi 90° , for the line set {(F i , GY i )} Each straight line is processed by this method, and the point set {M FiGjYi 90°}, let M FiGjYi =M FiGjYi 90° ;

[0010] 4) For any straight line (F i , GY i ), can be found in the straight line set {(F i , GY i )} find two straight lines with angles of α and 180°-α respectively with the straight line, and M FiGjYi The perpendicular bisector of the line connecting the points and the straight line (F i , GY i ) is denoted as M FiGjYi α , for the line set {(F i , GY i )} Each straight line is processed by this method, and the point set {M FiGjY α}, repeat this step until M FiGjY α The distance between the points approaches zero, let M FiGjYi =M of the last cycle FiGjY αPoint location;

[0011] 5) Reduce the angle α in step 4) from 90° to close to 0°, and repeat step 4) until the two M FiGjY α The distance between the points approaches zero, let M FiGjYi =M of the last cycle FiGjY α Point position, then {M FiGjYi} is the measured value of the plane horizontal position of the sample surface.

[0012] 6) Measuring point M FiGjYi The Z-axis coordinate is marked as Z FiGjYi The Z-axis coordinate of the ring-shaped light-emitting device group is marked as Z Fi , and the Z-axis coordinate of the annular photosensor is marked as Z Gj , then Z FiGjYi =length(M FiGjYi F i )*(Z Gj -Z Fi ) / length(M FiGjY G JZ i )+Z Fi .

[0013] The aforementioned radial shape optical measurement method will cause partial distortion of the measurement results when the object to be measured has spikes; FiGjYi The area with uniform distribution is the non-distortion area, M FiGjYi The relatively sparse distribution area is the distortion area, M FiGjYi The concentrated point is the end point of the spike. When the above characteristics appear, it can be determined that the object to be tested has a spike, which can be used as a basis for brittle failure of the object to be tested.

[0014] A device for realizing the above-mentioned radial shape optical measurement method includes a pressure chamber, a sample stage is arranged in the longitudinal direction of the pressure chamber, and an annular light emitting device group and a multi-layer annular photosensor are arranged on the inner wall of the pressure chamber parallel to the upper and lower end surfaces of the sample.

[0015] In the aforementioned radial optical measuring device, the annular light emitting device group is composed of an arrangement of independent light emitting points; and the annular photosensor is composed of an arrangement of independent photosensing points.

[0016] In the aforementioned radial-shaped optical measuring device, the annular light-emitting device group and the annular photosensitive sensor can be arranged alternately; the two ends can be annular light-emitting device groups with several layers of annular photosensitive sensors in the middle; or the light-emitting points and the photosensitive points can be arranged alternately in the same layer of annular light-emitting device groups and annular photosensitive sensors.

[0017] In the aforementioned radial optical measuring device, the annular light emitting device group and the annular photosensor are both wrapped by a transparent oil-proof film, and the inner wall of the pressure chamber is made of black light-absorbing material.

[0018] Beneficial Effects of the Invention

[0019] The measuring light source and photoreceptor of the present invention are fixed in position and do not need to be reinstalled each time measurement is performed, so there is no human influence and the measurement error is greatly reduced. At the same time, since the light source and photoreceptor do not need to contact the sample and can be sealed and fixed in a fixed position, compared with mechanical sensors, contact with pressure liquid is avoided and the service life of the equipment is extended. In addition, since an annular light-emitting device group is used for light emission and a multi-layer annular photosensitive sensor is used for light sensing, the 360° deformation of the sample can be measured by the change of the light source, thereby realizing the measurement of body deformation.

[0020] Furthermore, the present invention measures deformation by the change of shadow formed by light. Since the light emitted by the light-emitting device is blocked by the sample, the shadow will magnify the width of the sample, thereby magnifying the change in deformation, which is more convenient to measure the deformation and the measurement result is more accurate. In addition, the present invention is also applicable to steel pressure chambers for rock measurement by arranging the light-emitting device and the photosensitive sensor inside the pressure chamber, thereby broadening the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0022] Attached Figure 2 This is a top view of the pressure chamber during measurement;

[0023] Attached Figure 3 This is the front view inside the pressure chamber during measurement;

[0024] Attached Figure 4 A schematic diagram of the straight line drawn during the measurement in step (3);

[0025] Attached Figure 5 This is a schematic diagram of the straight line drawn during the measurement in step (4).

[0026] Explanation of the reference numerals: 1-pressure chamber, 2-sample stage, 3-upper annular light-emitting device group, 4-lower annular light-emitting device group, 5-annular photosensor, 6-processor, 7-display. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the embodiments, but they are not intended to limit the present invention.

[0028] Embodiments of the present invention

[0029] Embodiment 1: An optical measuring device for radial shape, as shown in the attached Figure 1-5 As shown, a pressure chamber 1 is included for containing samples and performing optical measurements. A sample stage 2 is provided in the longitudinal direction of the pressure chamber 1 for placing the sample. A horizontal annular light emitting device group 3 and a multi-layer annular photosensitive sensor 5 are provided on the inner wall of the pressure chamber 1 and are parallel to the upper and lower end surfaces of the sample. The annular light emitting device group 3 and the multi-layer annular photosensitive sensor 5 are connected to a processor 6, and the processed data is displayed on a display 7.

[0030] Preferably, the annular light emitting device group 3 is composed of an arrangement of independent light emitting points; and the annular photosensor 5 is composed of an arrangement of independent photosensing points.

[0031] Preferably, the annular light-emitting device group 3 and the annular photosensitive sensor 5 can be arranged alternately; the two ends can be annular light-emitting device groups 3, and several layers of annular photosensitive sensors 5 are sandwiched in the middle; the light-emitting points and the photosensitive points can also be arranged alternately in the same layer of annular light-emitting device group 3 and annular photosensitive sensor 5.

[0032] Preferably, the annular light emitting device group 3 and the annular photosensor 5 are both wrapped by a transparent oil-proof film, and the inner wall of the pressure chamber 1 is made of black light-absorbing material.

[0033] The specific steps of the measurement method of the radial deformation optical measurement device are as follows:

[0034] 1) The light-emitting points of the ring-shaped light-emitting device group 3 are numbered sequentially, and are recorded as F1, F2, ..., F i , the layers of the annular photosensor 5 are numbered sequentially, and are recorded as G1, G2, ..., Gj;

[0035] The sample is placed in the sample stage 2, and a certain light-emitting point F in the ring-shaped light-emitting device group 3 is i The light is emitted, forming a shadow on the inner wall of the pressure chamber 1 on the other side of the sample; by measuring the signal of the annular photosensitive sensor 5, it is determined that the left and right boundary positions of the shadow area and the light area on the j-th layer of the annular photosensitive sensor 5 are GjY i and GjY i ', where Y i is the coordinate of the light-dark boundary point on the j-th layer annular photosensor 5, and each luminous point Fi in the annular luminous particle annular light-emitting device group 3 is controlled to emit light in turn, and a j-th layer annular photosensor measurement data set {F i , GY i};

[0036] 2) Connect all the luminous points with the corresponding light-dark dividing points by straight lines, and project the straight line set onto the plane where the corresponding luminous points are located, and obtain the straight line set {(F i , GY i )}, straight line (Fi , GY i ) is tangent to the sample and is marked as M FiGjYi point;

[0037] 3) For any straight line (F i , GY i ), can be found in the straight line set {(F i , GY i )}, find two perpendicular lines, the middle parallel line between these two lines and the line (F i , GY i ) is denoted as M FiGjYi 90° , for the line set {(F i , GY i )} Each straight line is processed by this method, and the point set {M FiGjYi 90°}, let M FiGjYi =M FiGjYi 90° ;

[0038] 4) For any straight line (F i , GY i ), can be found in the straight line set {(F i , GY i )} find two straight lines with angles of α and 180°-α respectively with the straight line, and M FiGjYi The perpendicular bisector of the line connecting the points and the straight line (F i , GY i ) is denoted as M FiGjYi α , for the line set {(F i , GY i )} Each straight line is processed by this method, and the point set {M FiGjY α}, repeat this step until M FiGjY α The distance between the points approaches zero, let M FiGjYi =M of the last cycle FiGjY α Point location;

[0039] 5) Reduce the angle α in step 4) from 90° to close to 0°, and repeat step 4) until the two M FiGjY α The distance between the points approaches zero, let M FiGjYi =M of the last cycle FiGjY α Point position, then {M FiGjYi} is the measured value of the plane horizontal position of the sample surface.

[0040] 6) Measuring point M FiGjYi The Z-axis coordinate is marked as Z FiGjYi The Z-axis coordinate of the ring-shaped light-emitting device group 3 is marked as Z Fi , and the Z axis coordinate of the annular photosensor 5 is marked as Z Gj , then Z FiGjYi =length(M FiGjYi F i )*(Z Gj -Z Fi ) / length(M FiGjY G JZ i )+Z Fi .

[0041] Embodiment 2: This embodiment is similar to the embodiment 1, except that when the sample has spikes, the measurement result will be partially distorted; FiGjYi The area with uniform distribution is the non-distortion area, M FiGjYi The relatively sparse distribution area is the distortion area, M FiGjYi The concentrated point is the end point of the spike. When the above characteristics appear, it can be determined that the object to be tested has a spike, which can be used as a basis for brittle failure of the object to be tested.

Claims

1. A radial shape optical measurement method, characterized in that: The method comprises placing a sample in a sample stage (2) of a pressure chamber (1), arranging an annular light emitting device group (3) and an annular light-sensitive sensor (5) on the inner wall of the pressure chamber (1), forming a shadow on the annular light-sensitive sensor (5) on the other side of the sample through light emitted by the light-emitting points on the annular light-emitting device group (3), measuring the position of the shadow demarcation point, connecting all the light-emitting point positions with the corresponding shadow demarcation point positions with straight lines, and the shape inscribed in these straight lines is the radial shape of the sample; The specific steps of the method are as follows: 1) The light-emitting points of the ring-shaped light-emitting device group (3) are numbered sequentially, and recorded as F1, F2, ... F i , the layers of the annular photosensor (5) are numbered sequentially, and are recorded as G1, G2, ..., Gj; The sample is placed in the sample stage (2), and a light emitting point F in the annular light emitting device group (3) is i The light is emitted, forming a shadow on the inner wall of the pressure chamber (1) on the other side of the sample; by measuring the signal of the annular photosensor (5), it is determined that the left and right boundary positions of the shadow area and the light area on the j-th layer of the annular photosensor (5) are GjY i and GjY i ', where Y i is the coordinate of the light-dark boundary point on the j-th layer annular photosensor (5), and each luminous point Fi in the annular luminous particle annular luminous device group (3) is controlled to emit light in turn, thereby obtaining a j-th layer annular photosensor measurement data set {F i , GY i }; 2) Connect all the luminous points with the corresponding light-dark dividing points by straight lines, and project the straight line set onto the plane where the corresponding luminous points are located, and obtain the straight line set {(F i , GY i )}, straight line (F i , GY i ) is tangent to the sample and is marked as M FiGjYi point; 3) For any straight line (F i , GY i ), can be found in the straight line set {(F i , GY i )}, find two perpendicular lines, the middle parallel line between these two lines and the line (F i , GY i ) is denoted as M FiGjYi 90° , for the line set {(F i , GY i )} Each straight line is processed by this method, and the point set {M FiGjYi 90° }, let M FiGjYi =M FiGjYi 90° ; 4) For any straight line (F i , GY i ), can be found in the straight line set {(F i , GY i )} find two straight lines with angles of α and 180°-α respectively with the straight line, and M FiGjYi The perpendicular bisector of the line connecting the points and the straight line (F i , GY i ) is denoted as M FiGjYi α , for the set of lines {(F i , GY i )} Each straight line is processed by this method, and the point set {M FiGjY α }, repeat this step until M FiGjY α The distance between the points approaches zero, let M FiGjYi = M of the last cycle FiGjY α Point location; 5) Reduce the angle α in step 4) from 90° to close to 0°, and repeat step 4) until M FiGjY α The distance between the points approaches zero, let M FiGjYi = M of the last cycle FiGjY α Point position, then {M FiGjYi } is the measured value of the plane horizontal position of the sample surface; 6) Measuring point M FiGjYi The Z-axis coordinate is marked as Z FiGjYi The Z-axis coordinate of the annular light-emitting device group (3) is marked as Z Fi , and the Z-axis coordinate of the annular photosensor (5) is marked as Z Gj , then Z FiGjYi =length(M FiGjYi F i )*(Z Gj -Z Fi ) / length(M FiGjY G JZ i )+Z Fi .

2. The optical measurement method of radial shape according to claim 1, characterized in that: When the sample has spikes, the measurement results will be partially distorted; FiGjYi The area with uniform distribution is the non-distortion area, M FiGjYi The relatively sparse distribution area is the distortion area, M FiGjYi The concentrated point is the end point of the spike. When the above characteristics appear, it can be determined that the object to be tested has a spike, which can be used as a basis for brittle failure of the object to be tested.

3. A device for implementing the optical measurement method of radial shape according to any one of claims 1 to 2, characterized in that: The invention comprises a pressure chamber (1), wherein a sample platform (2) is provided in the longitudinal direction of the pressure chamber (1), and an annular light emitting device group (3) and a multi-layer annular light-sensitive sensor (5) are provided on the inner wall of the pressure chamber (1) and are parallel to the upper and lower end surfaces of the sample.

4. The optical measuring device for radial shape according to claim 3, characterized in that: The annular light emitting device group (3) is composed of an arrangement of independent light emitting points; and the annular light sensitive sensor (5) is composed of an arrangement of independent light sensitive points.

5. The optical measuring device of radial shape according to claim 3, characterized in that: The annular light emitting device group (3) and the annular light sensitive sensor (5) are arranged alternately; or arranged so that the two ends are annular light emitting device groups (3) with a plurality of layers of annular light sensitive sensors (5) sandwiched in the middle; or in the same layer of annular light emitting device groups (3) and annular light sensitive sensors (5), the light emitting points and the light sensitive points are arranged alternately.

6. The optical measuring device of radial shape according to claim 3, characterized in that: The annular light emitting device group (3) and the annular light sensitive sensor (5) are both wrapped by a transparent oil-proof film, and the inner wall of the pressure chamber (1) is made of a black light absorbing material.

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