A method and device for multi-point ranging based on annular belt oblique incidence

Abstract

The present invention relates to a method and device for multi-point distance measurement based on annular belt oblique incidence, comprising a standard lamp; a spectroradiometer; a distance measurement component, which is arranged between the standard lamp and the spectroradiometer, and the distance measurement component comprises: an aperture plate, which is arranged perpendicularly to the line connecting the center of the standard lamp and the center of the spectroradiometer, and a through hole is opened on the aperture plate, and the center of the through hole is located on the line connecting the center of the standard lamp and the center of the spectroradiometer; an annular moving mechanism, which is arranged on the aperture plate and is arranged concentrically with the through hole; a laser ruler, which is arranged obliquely on the annular moving mechanism, and the laser ruler is driven to move by the annular moving mechanism to perform multi-point measurement, and the standard deviation is calculated to determine whether the parallelism of the aperture plate and the spectroradiometer meets the requirements. The present invention realizes the annular movement and radial movement of the laser ruler by cooperating with the annular belt guide rail, realizes the measurement of multiple points, and measures the parallelism between the aperture plate and the reference surface of the detection ring while measuring the distance.

Description

Technical Field

[0001] The invention relates to the field of spectrum radiation technology, in particular to a method and device for multi-point ranging based on annular zone oblique incidence. Background Art

[0002] Refer to Appendix A of JJF 1975-2022 "Spectroradiometer Calibration Specifications" for the content of the example of uncertainty assessment of spectroradiometer measurement. The distance factor between the standard lamp and the spectroradiometer is one of the seven independent uncertainty factors given in the example. The distance measurement and adjustment between the standard lamp and the spectroradiometer during the calibration process is a key evaluation item in the uncertainty assessment of spectroradiometer calibration.

[0003] The accurate measurement and adjustment of the distance between the standard lamp and the instrument reference surface in the spectral radiation calibration optical path is an important part of the uncertainty control of spectral radiation calibration. At present, there are mainly two methods for measuring distance in the spectral radiation calibration process: mechanical ruler and laser ruler.

[0004] However, since there is usually no overlap between the reference plane of the standard lamp and the reference plane of the instrument receiving end, and the detection reference plane of the spectroradiometer is usually a narrow-band ring, this has some effects on the distance measurement, specifically:

[0005] 1. Mechanical ruler measurement requires that the standard lamp reference surface and the instrument detection reference surface be extended through rigid right-angle accessories so that the scale of the mechanical ruler can be visually read as close to the extended edges of the two reference surfaces as possible. This process will cause varying degrees of human error.

[0006] 2. There is usually no overlapping area between the reference plane of the standard lamp and the reference plane of the instrument receiving end, which makes bidirectional laser light source ranging not very applicable. It is also necessary to extend the two reference planes to produce an overlapping area before bidirectional laser light source ranging can be used. This process still requires manual operation and has an impact.

[0007] 3. During the calibration measurement process, the stage usually has multi-dimensional adjustment functions, including rotation and pitch. The parallelism between the standard light reference plane and the instrument measurement reference plane is also an important influencing factor. When measuring these two parallel planes, it is necessary to provide the parallelism measurement results as data for error evaluation. The measurement of parallelism requires multi-directional point distance measurement of the plane and characterization through the discreteness of multi-point distances, which greatly increases the complexity of the distance measurement process, so that parallelism measurement is not performed by default in most cases.

[0008] To this end, we propose a method and device based on annular oblique incidence multi-point ranging. Summary of the invention

[0009] In view of the shortcomings in the above-mentioned existing production technology, the applicant provides a method and device based on annular belt oblique incidence multi-point ranging, which realizes the annular movement and radial movement of the laser ruler by cooperating with the annular belt guide rail and the linear guide rail. It can adapt to the measurement of detection ring reference surfaces of different diameters and realize the measurement of multi-directional points. While measuring the distance, the parallelism between the aperture plate and the detection ring reference surface is calculated.

[0010] The technical solution adopted by the present invention is as follows:

[0011] A multi-point distance measuring device based on annular oblique incidence, used in a spectral radiation calibration optical path, comprising:

[0012] Standard lamps, used to maintain and deliver the spectral density of irradiance;

[0013] Spectroradiometer, used to measure spectral radiance, spectral radiance brightness, and relative spectral power distribution. The center of the standard lamp and the center of the spectroradiometer are on the same straight line;

[0014] The distance measuring component is arranged between the standard lamp and the spectroradiometer, and the distance measuring component includes:

[0015] An aperture plate is arranged perpendicular to the line connecting the center of the standard lamp and the center of the spectroradiometer, and a through hole is opened on the aperture plate, and the center of the through hole is located on the line connecting the center of the standard lamp and the center of the spectroradiometer;

[0016] The annular moving mechanism is arranged on the aperture plate and is arranged concentrically with the through hole;

[0017] The laser ruler is tilted and set on the annular moving mechanism. The annular moving mechanism drives the laser ruler to move for multi-point measurement. The standard deviation is calculated to determine whether the parallelism between the aperture plate and the spectroradiometer meets the requirements.

[0018] It is further characterized by:

[0019] It also includes a laser light source for generating a visible linear light beam and for indicating and ensuring that the standard lamp and the center of the receiving plane of the spectroradiometer are on the same straight line.

[0020] The laser light source is installed on the base through a first bracket, the standard lamp is installed on the base through a second bracket, the spectroradiometer is installed on the adjustment table, and the spectroradiometer and the standard lamp can be fine-tuned.

[0021] The spectroradiometer is provided with a detection ring, the detection ring is provided with a detection ring reference surface, and the laser ruler is irradiated on the detection ring reference surface.

[0022] The aperture plate is installed on the base through a third bracket. The annular moving mechanism includes an annular track and a first moving block. The first moving block is slidably arranged on the annular track and is driven by a driving mechanism.

[0023] The laser ruler is installed on the annular moving mechanism through a linear moving mechanism. The linear moving mechanism includes a linear track and a second moving block. The second moving block is slidably arranged on the linear track. The second moving block is driven by a driving mechanism. The laser ruler is tiltedly arranged on the second moving block.

[0024] The present invention also discloses a method for multi-point ranging based on annular zone oblique incidence, comprising the following steps:

[0025] Step a, place the standard plate at a set position in front of the laser ruler. At this time, the distance from the center of the standard lamp to the reference plane of the standard plate is a known quantity dt1; read the oblique incident measurement distance dc1 of the laser ruler at this time;

[0026] Step b, place the standard plate at the second set position in front of the laser ruler. At this time, the distance from the center of the standard lamp to the reference plane of the standard plate is a known quantity dt2; read the oblique incident measurement distance dc2 of the laser ruler at this time;

[0027] Step c, bring in dt1, dc1, dt2, dc2

[0028] dt=ds+dc·sinθ (V), we get

[0029] dt1=ds+dc1·sinθ(vi);

[0030] dt2=ds+dc2·sinθ (VII);

[0031] Solved

[0032]

[0033]

[0034] Where: dt is the distance from the center of the standard lamp to the reference plane of the detection ring of the spectroradiometer;

[0035] ds is the distance from the center of the standard lamp to the laser ruler emission point;

[0036] dc is the distance measured by the laser ruler at oblique incidence;

[0037] θ is the angle between the oblique incidence of the laser scale and the aperture plate;

[0038] In step d, sinθ and ds are substituted into equation (5) as known numbers, and the dt value is calculated by measuring dc and substituting it into equation (5).

[0039] It is further characterized by:

[0040] When measuring dc1 in step a and dc2 in step b, the first moving block drives the laser ruler to move to N positions along the circular track through the linear moving mechanism to measure point by point, and then

[0041]

[0042] Where: d i is the measured distance value of the i-th position;

[0043] N is the number of measurement locations;

[0044] is the average of the distances measured at N locations;

[0045] Get the mean value as a measured value.

[0046] According to the standard deviation formula:

[0047]

[0048] Where: D is a set of N position measurement distances, D = {d1, d2, ..., dN};

[0049] d i is the measured distance value of the i-th position;

[0050] N is the number of measurement locations;

[0051] is the average of the distances measured at N locations;

[0052] The standard deviation is calculated to determine whether the parallelism meets the requirements.

[0053] The linear motion mechanism can drive the laser ruler to move in the radial direction, so as to adapt to the detection ring reference surfaces of different diameters for measurement.

[0054] The beneficial effects of the present invention are as follows:

[0055] The invention has a compact and reasonable structure and is easy to operate. The circular and radial movements of the laser ruler are realized by using an annular guide rail in combination with a linear guide rail. The invention can be adapted to measure detection ring reference surfaces of different diameters, realize the measurement of multi-directional points, and calculate the parallelism between the aperture plate and the detection ring reference surface while measuring the distance.

[0056] At the same time, the present invention also has the following advantages:

[0057] (1) Using oblique incidence distance measurement instead of vertical distance measurement and then converting it into vertical distance using trigonometric function relationship can effectively solve the problem of plane spacing in non-overlapping areas.

[0058] (2) Based on the laser ruler oblique incidence distance measurement device of the present invention, only when calibrating the geometric parameters ds and sinθ of the spectral radiation calibration optical path system, a mechanical ruler measurement process is required, which involves a certain amount of manual participation. The measurement of dt in subsequent test calibration can be automatically controlled, which can effectively eliminate the influence of the manual operation process.

[0059] (3) On the basis of the annular guide rail, a linear guide rail is stacked. In addition to annular sliding, the laser ruler can also slide radially, and can be adapted to the receiving annular reference planes of different diameters of the spectral radiation instrument.

[0060] (4) By placing the standard plate on two calibrated displacements, the values ​​of ds and sinθ can be obtained. After the system is calibrated, workers no longer need to manually measure the values. They only need to install the spectroradiometer 3 and then measure dc through the laser ruler 505. Then, the value of dt can be calculated according to equation (V). This avoids the error caused by manual measurement and ensures the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a schematic diagram of the corresponding relationship between the sides and angles of the trigonometric functions of the right triangle of the present invention.

[0062] Figure 2 It is a schematic diagram of the oblique incidence effect of the laser ruler ring zone distribution of the present invention.

[0063] Figure 3 It is a schematic diagram of the effect of the laser ruler measuring and detecting the torus of the present invention.

[0064] Figure 4 It is a schematic diagram of the optical path effect of the spectral radiation calibration of the present invention.

[0065] Figure 5 Schematic diagram of the spectroradiometer of the present invention.

[0066] Figure 6 Schematic diagram of the geometric relationship of the spectral radiation calibration optical path of the present invention.

[0067] Figure 7 It is a schematic diagram of the geometric relationship of the spectral radiation calibration light path when the standard plate of the present invention is in position one.

[0068] Figure 8 It is a schematic diagram of the geometric relationship of the spectral radiation calibration optical path when the standard plate of the present invention is in position two.

[0069] Wherein: 1. laser light source; 101. first bracket; 2. standard lamp; 201. second bracket; 3. spectroradiometer; 301. detection ring; 3011. detection ring reference surface; 4. base; 5. ranging assembly; 501. third bracket; 502. aperture plate; 5021. through hole; 503. annular moving mechanism; 5031. annular track; 5032. first moving block; 504. linear moving mechanism; 5041. linear track; 5042. second moving block; 505. laser ruler; 6. standard flat plate. DETAILED DESCRIPTION

[0070] The specific implementation of the present invention is described below in conjunction with the accompanying drawings.

[0071] Example 1

[0072] like Figure 1-Figure 6 As shown, a multi-point ranging device based on annular oblique incidence includes a standard lamp 2 and a spectroradiometer 3. The standard lamp 2 is mounted on a base 4 through a second bracket 201, and the spectroradiometer 3 is mounted on an adjustment table. It also includes a laser light source 1 for generating a visible linear light beam and for indicating and ensuring that the centers of the receiving planes of the standard lamp 2 and the spectroradiometer 3 are on the same straight line. The laser light source 1 is mounted on the base 4 through a first bracket 101. The standard lamp 2 is a standard measuring instrument for maintaining and transmitting the spectral density of irradiance. The spectroradiometer 3 is an optical instrument for measuring spectral radiance, spectral radiance brightness or relative spectral power distribution.

[0073] The spectroradiometer 3 is provided with a detection ring 301, and the detection ring 301 is provided with a detection ring reference surface 3011. The laser ruler 505 is irradiated on the detection ring reference surface 3011.

[0074] like Figure 2-Figure 4 As shown, a distance measuring assembly 5 is arranged between the standard lamp 2 and the spectroradiometer 3, and the distance measuring assembly 5 includes a third bracket 501, an aperture plate 502, a circular moving mechanism 503, a linear moving mechanism 504 and a laser ruler 505. The aperture plate 502 is installed on the base 4 through the third bracket 501. A through hole 5021 is provided on the aperture plate 502, and the standard lamp 2 irradiates the spectroradiometer 3 through the through hole 5021. The center of the through hole 5021 is on the same straight line as the center of the laser light source 1, the center of the standard lamp 2 and the center of the spectroradiometer 3; the aperture plate 502 is arranged perpendicular to the line connecting the center of the standard lamp 2 and the center of the spectroradiometer 3;

[0075] The linear movement mechanism 504 includes a linear track 5041 and a second moving block 5042. The second moving block 5042 is slidably arranged on the linear track 5041. The second moving block 5042 is driven by a driving mechanism, and the driving mechanism drives the second moving block 5042 to move on the linear track 5041. The laser ruler 505 is obliquely fixed on the second moving block 5042, and the second moving block 5042 can drive the laser ruler 505 to move in the radial direction;

[0076] The circular movement mechanism 503 includes a circular track 5031 and a first moving block 5032. The first moving block 5032 is slidably arranged on the circular track 5031. The first moving block 5032 is driven by a driving mechanism, and the driving mechanism drives the first moving block 5032 to move on the circular track 5031. The circular track 5031 is arranged on the aperture plate 502 and is located outside the through hole 5021. The circular track 5031 and the through hole 5021 are concentric.

[0077] The linear track 5041 is arranged on the first moving block 5032, and the first moving block 5032 drives the laser ruler 505 to move along the circular track 5031 through the linear movement mechanism 504.

[0078] As Figure 1 shown, the laser ruler 505 uses oblique incidence to measure the distance, and then uses the ratio of the opposite side to the hypotenuse of the trigonometric function to indirectly measure the distance;

[0079] Let point A be the incident point of the laser ruler 505, and point B be the point where the laser light source irradiates on the detection ring reference surface 3011. The actually measured oblique distance is c, and the vertical distance a can be indirectly calculated. According to the trigonometric function relationship:

[0080] sin(A) = a / c (1)

[0081] Then there is

[0082] a = c·sin(A) (2)

[0083] As Figure 2 、 Figure 3 shown, the second moving block 5042 can drive the laser ruler 505 to move in the radial direction so as to be adapted to the detection ring reference surface 3011 with different diameters for measurement.

[0084] The first moving block 5032 drives the laser ruler 505 to move along the circular track 5031 to N positions through the linear movement mechanism 504 for point-by-point measurement. The measurement positions can be evenly distributed and the intervals are fixed at an angle.

[0085] The distance measurement values ​​at multiple positions can be used to calculate the parallelism between the aperture plate 502 and the detection ring reference surface 3011. The standard deviation can be known through multiple distance measurements as a representation of the parallelism. For example, the standard deviation of the multi-point distance is set to not exceed 0.5 mm. The standard deviation is represented by formula (III), and the average value is represented by formula (IV).

[0086]

[0087]

[0088] in

[0089] D is a set of N position measurement distances, D = {d1, d2, ..., dN};

[0090] d i is the measured distance value of the i-th position;

[0091] N is the number of measurement locations;

[0092] is the average of the distances measured at N locations;

[0093] Since the distance d i Related to the azimuth angle, if the parallelism does not meet the requirements, the spectroradiometer 3 or the standard lamp 2 can be fine-tuned according to the azimuth relationship, and then measurements are made at multiple positions to calculate whether the parallelism meets the requirements. The above operations are repeated until the parallelism meets the measurement requirements and then the plane spacing is measured.

[0094] Example 2

[0095] like Figure 5 As shown, the relationship between the geometric quantities in the system is shown in equation (V).

[0096] dt=ds+dc·sinθ (V)

[0097] in

[0098] dt is the distance from the center of the standard lamp 2 to the detection ring reference surface 3011 of the spectroradiometer 3;

[0099] ds is the distance from the center of the standard lamp 2 to the emission point of the laser ruler 505;

[0100] dc is the oblique incidence measurement distance of the laser ruler 505;

[0101] da is the horizontal distance from the laser ruler 505 emission point to the reference surface 3011 of the detection ring of the spectroradiometer 3;

[0102] db is the vertical distance from the laser ruler 505 emission point to the reference surface 3011 of the detection ring of the spectroradiometer 3;

[0103] θ is the angle between the oblique incident laser ruler 505 and the aperture plate 502;

[0104] DC and DA conform to the sinusoidal relationship of trigonometric functions.

[0105] A multi-point ranging method based on annular oblique incidence includes the following steps:

[0106] Place the standard plate 6 at a set position in front of the laser ruler 505. At this time, the distance from the center of the standard lamp 2 to the reference plane of the standard plate 6 is dt1, and dt1 is set in advance as a known quantity.

[0107] Adjust the standard plate 6 to the second position set before the laser ruler 505. At this time, the distance from the center of the standard lamp 2 to the reference plane of the standard plate 6 is dt2, and dt2 is set in advance as a known quantity;

[0108] The first moving block 5032 drives the laser ruler 505 to move to N positions along the circular track 5031 through the linear moving mechanism 504 to perform point-by-point measurement, and obtains the multi-point averages of the standard plate 6 at displacement one and position two as the measurement values ​​of dc1 and dc2 respectively;

[0109] Through the calibration test process using the standard plate 6 at two different positions, the corresponding dt1, dc1, dt2, dc2 are substituted into equation (5) to obtain two calibration equations:

[0110] dt1=ds+dc1·sinθ (vi)

[0111] dt2=ds+dc2·sinθ (VII)

[0112] The values ​​of the system geometric parameters ds and sinθ are thus solved, as shown in equation (8) and equation (9).

[0113]

[0114]

[0115] After calibration and measurement, ds and sinθ can be used as known geometric parameters of the system for subsequent calibration tests of spectral radiation instruments.

[0116] After the system is calibrated, it is only necessary to measure dc through the laser ruler 505, and the corresponding dt value can be calculated according to equation (V).

[0117] The corresponding dc1 and dc2 are measured at the position 1 and the position 2 by the standard plate 6, and the dt1 and dt2 at the position 1 and the position 2 are the values ​​set when setting the displacement 1 and the position 2, so that when placing the standard plate 6, it is not necessary to measure dt1 and dt2 separately, thereby reducing the error that may be caused by the measurement;

[0118] And after determining ds and sinθ, we only need to measure the value of dc, and then we can calculate the value of dt according to equation (5);

[0119] After the system is calibrated, workers no longer need to manually measure the value. They only need to install the spectroradiometer 3 and then measure dc through the laser ruler 505, and then they can calculate the value of dt according to equation (V); thus avoiding the error caused by manual measurement and ensuring the accuracy of the measurement.

[0120] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A multi-point distance measurement device based on annular oblique incidence, used in the spectral radiation calibration optical path, characterized in that: include: Standard lamps (2) for maintaining and delivering the spectral intensity of irradiance; A spectroradiometer (3) is used to measure spectral radiance, spectral radiance, and relative spectral power distribution, wherein the center of the standard lamp (2) and the center of the spectroradiometer (3) are on the same straight line; The distance measuring component (5) is arranged between the standard lamp (2) and the spectroradiometer (3), and the distance measuring component (5) comprises: An aperture plate (502) is arranged perpendicular to a line connecting the center of the standard lamp (2) and the center of the spectroradiometer (3); a through hole (5021) is provided on the aperture plate (502), and the center of the through hole (5021) is located on a line connecting the center of the standard lamp (2) and the center of the spectroradiometer (3); An annular moving mechanism (503) is arranged on the aperture plate (502) and is arranged concentrically with the through hole (5021); A laser ruler (505) is tiltedly arranged on the annular moving mechanism (503), and the annular moving mechanism (503) drives the laser ruler (505) to move to perform multi-point measurement, and the standard deviation is calculated to determine whether the parallelism between the aperture plate (502) and the spectroradiometer (3) meets the requirements; It also includes a laser light source (1) for generating a visible linear light beam and for indicating and ensuring that the center of the standard lamp (2) and the receiving plane of the spectroradiometer (3) are on the same straight line; The laser light source (1) is mounted on the base (4) via a first bracket (101), the standard lamp (2) is mounted on the base (4) via a second bracket (201), the spectroradiometer (3) is mounted on an adjustment table, and the spectroradiometer (3) and the standard lamp (2) can be fine-tuned; The spectroradiometer (3) is provided with a detection ring (301), the detection ring (301) is provided with a detection ring reference surface (3011), and the laser ruler (505) irradiates the detection ring reference surface (3011).

2. A multi-point ranging device based on annular zone oblique incidence as claimed in claim 1, characterized in that: The aperture plate (502) is mounted on the base (4) via a third bracket (501); the annular moving mechanism (503) comprises an annular track (5031) and a first moving block (5032); the first moving block (5032) is slidably arranged on the annular track (5031); and the first moving block (5032) is driven by a driving mechanism.

3. A multi-point ranging device based on annular zone oblique incidence as claimed in claim 2, characterized in that: The laser ruler (505) is installed on the annular moving mechanism (503) via a linear moving mechanism (504); the linear moving mechanism (504) comprises a linear track (5041) and a second moving block (5042); the second moving block (5042) is slidably arranged on the linear track (5041); the second moving block (5042) is driven by a driving mechanism; and the laser ruler (505) is tiltedly arranged on the second moving block (5042).

4. A method for multi-point ranging based on annular zone oblique incidence, using the multi-point ranging device based on annular zone oblique incidence according to claim 3, characterized in that: The steps include: Step a, placing the standard plate (6) at a set position in front of the laser ruler (505), at which time the distance from the center of the standard lamp (2) to the reference surface of the standard plate (6) is a known quantity dt1; reading the oblique incident measurement distance dc1 of the laser ruler (505) at this time; Step b, placing the standard plate (6) at the second set position in front of the laser ruler (505), at which time the distance from the center of the standard lamp (2) to the reference surface of the standard plate (6) is a known quantity dt2; reading the oblique incident measurement distance dc2 of the laser ruler (505) at this time; Step c, bring in dt1, dc1, dt2, dc2 dt=ds+dc·sinθ (V), we get dt1=ds+dc1·sinθ(vi); dt2=ds+dc2·sinθ (VII); Solved Where: dt is the distance from the center of the standard lamp (2) to the detection ring reference surface (3011) of the spectroradiometer (3); ds is the distance from the center of the standard lamp (2) to the emission point of the laser ruler (505); dc is the oblique incidence measurement distance of the laser ruler (505); θ is the angle between the oblique incidence of the laser ruler (505) and the aperture plate (502); In step d, sinθ and ds are substituted into equation (5) as known numbers, and the dt value is calculated by measuring dc and substituting it into equation (5).

5. The method for multi-point ranging based on annular oblique incidence as claimed in claim 4, characterized in that: When measuring dc1 in step a and dc2 in step b, the first moving block (5032) drives the laser ruler (505) to move to N positions along the circular track (5031) through the linear moving mechanism (504) to measure point by point, and then Where: d i is the measured distance value of the i-th position; N is the number of measurement locations; is the average of the distances measured at N locations; Get the mean value as a measured value.

6. The method for multi-point ranging based on annular oblique incidence as claimed in claim 5, characterized in that: According to the standard deviation formula: Where: D is a set of N position measurement distances, D = {d1, d2, ..., dN}; d i is the measured distance value of the i-th position; N is the number of measurement locations; is the average of the distances measured at N locations; The standard deviation is calculated to determine whether the parallelism meets the requirements.

7. The method for multi-point ranging based on annular oblique incidence as claimed in claim 5, characterized in that: The linear motion mechanism (504) can drive the laser ruler (505) to move in the radial direction, and is used to adapt to detection ring reference surfaces (3011) of different diameters for measurement.

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