Optical receiver detection method, optical receiving sensor and laser demarcation device

Abstract

The invention discloses an optical receiver detection method, an optical receiving sensor and a laser demarcation device, and belongs to the technical field of laser demarcation devices, and the detection method provided by the invention comprises the following steps: (1) calibrating the height range of a photodiode; (2) detecting and calculating the position of a laser ray; and (2) laser is projected to the light receiver, the electric signal amplitude of each photodiode is recorded, the maximum electric signal amplitude is determined, and after the position of the laser light is calculated, the relative position of the laser light on the light receiver is determined according to the calibration value range in the step (1). According to the optical receiver detection method provided by the invention, the position of the laser light can be accurately judged, and the coordinate of the position can be accurate to 1mm. According to the invention, there is no gap between the light receiving areas of the photodiode in the light receiver, and no matter where the laser light irradiates, the laser light can be identified by the light receiver and the specific position of the signal can be judged.

Description

Technical Field

[0001] The present invention relates to the technical field of laser line projectors, and in particular to a light receiver detection method, a light receiving sensor and a laser line projector. Background Art

[0002] As a core tool in modern engineering surveying, laser line projectors project high-precision laser reference lines to enable spatial calibration in scenarios such as building positioning, equipment installation, and interior decoration. In this system, optical receivers are key terminals for detecting laser signals, and their positioning accuracy directly impacts the final construction quality.

[0003] Current optical receivers generally use regularly arranged photodiode (PD) arrays to capture laser signals. Traditional PD designs rely on discretely distributed photosensitive cells, determining the laser emission location by comparing the output current intensity of each cell. However, in this scenario, the receiver can only accurately output the center coordinates when the laser strikes the center of the PD. In practice, the light spot often deviates from the center due to instrument jitter, projection angle deviation, or long-distance divergence effects, landing on the edge of the PD cells. In this case, due to the physical gaps between PD cells and the lack of continuous position sensing, the optical receiver can only determine the light's position in a rough direction, such as above or below the center, based on the single PD cell with the strongest signal. It cannot calculate the precise coordinates of the light spot, resulting in reduced positioning accuracy at non-center points. This is especially true in scenarios such as wall flatness inspection and floor leveling, which require millimeter-level precision. The PD boards in existing optical receivers cannot meet the requirements of continuous position feedback. Summary of the Invention

[0004] In order to solve the problem of low detection accuracy of the optical receiver of the existing laser line projector, the present invention aims to provide a light receiver detection method, a light receiving sensor and a laser line projector.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] First, the present invention provides a method for detecting an optical receiver, wherein the optical receiver includes at least two columns of photodiodes, and the photodiodes in adjacent columns are arranged in a staggered manner. Detection is performed according to the following steps:

[0007] (1) calibrating the photodiode height range;

[0008] Fixing the light receiver on a standard height ruler, using a standard light source to align the center position of the nth photodiode, and calculating the ratio of the electrical signal amplitudes at the center positions of the (n+1)th and (n-1)th photodiodes respectively;

[0009] Starting from the center position of the nth photodiode, the standard height ruler is moved upward and downward respectively, and the ratio of the electrical signal amplitude at the center position of the (n+1)th photodiode and the (n-1)th photodiode is recorded in sequence to form a calibration value range;

[0010] (2) Detect and calculate the laser light position;

[0011] Project the laser onto the optical receiver, record the electrical signal amplitude of each photodiode, determine the maximum electrical signal amplitude, calculate the position of the laser light, and determine the relative position of the laser light on the optical receiver based on the calibration value range in step (1).

[0012] In one embodiment, the light receiving area of the photodiode overlaps with the light receiving areas of two upper and lower adjacent photodiodes in adjacent columns on a collinear basis.

[0013] In one embodiment, the method for calculating the ratio of the electrical signal amplitudes at the center positions of the (n+1)th and (n-1)th photodiodes in step (1) is:

[0014]

[0015] V a is the electrical signal amplitude at the center position of the (n-1)th photodiode, V c is the electrical signal amplitude at the center position of the (n+1)th photodiode.

[0016] In one embodiment, in step (1), the standard height gauge moves a distance of 1 mm each time, and moves up and down m times respectively, where m is no more than The maximum integer of , L is the light receiving length of the photodiode.

[0017] In one embodiment, the method for calculating the position of the laser light in step (2) is:

[0018]

[0019] f is the number of the photodiode corresponding to the maximum amplitude of the electrical signal, and L is the light receiving length of the photodiode.

[0020] 6. The optical receiver detection method according to claim 5, wherein the method for calculating the relative position of the laser light on the optical receiver in step (2) is:

[0021]

[0022] H=D―(f―1)×K,

[0023] Xf is the ratio of the electrical signal amplitude at the center of the f-th photodiode, V f+1 is the electrical signal amplitude at the center of the (f+1)th photodiode, V f-1 is the electrical signal amplitude at the center position of the (f-1)th photodiode;

[0024] when When , the position of the laser light is located at the center position of the f-th photodiode;

[0025] when When the laser beam is positioned above the f-th photodiode, X f Compare with the calibration value range determined in step (2);

[0026] when When the laser beam is positioned at the lower portion of the f-th photodiode, X f Compare with the calibration value range calibrated in step (2) for comparison.

[0027] Secondly, the present invention also provides a light receiving sensor including a light receiver, the light receiver including at least two columns of photodiodes, the photodiodes in adjacent columns are staggered with each other, and the light receiver detects the position of the laser light according to any detection method described above.

[0028] Finally, the present invention also provides a laser line projector, which is used in conjunction with the light receiving sensor.

[0029] The optical receiver of the present invention has no gaps between the light-receiving areas of the photodiodes. Regardless of where the laser beam is directed, the optical receiver can detect and determine the specific location of the signal. Furthermore, because the photodiodes are independent, blind spots are minimized, making position determination more accurate and preventing missed detections. The optical receiver detection method provided by the present invention can accurately determine the location of the laser beam, with coordinates accurate to 1 mm.

[0030] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the arrangement structure of the photodiodes in the optical receiver of the present invention.

[0032] Figure 2 This is a schematic structural diagram of the optical receiver in the detection method provided by the present invention. DETAILED DESCRIPTION

[0033] To make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1 The figure shows the arrangement of photodiodes 11 in the optical receiver 1 according to the present invention, comprising at least two columns of photodiodes 11. The photodiodes 11 in adjacent columns are staggered so that one column of photodiodes 11 falls between two adjacent photodiodes 11 in the adjacent columns. Furthermore, in the figure, the inner frame of the photodiodes 11 represents the light-receiving area 111 of the photodiodes 11, and the outer frame 112 represents the actual package size of the photodiodes 11. In the present invention, the light-receiving area 111 of one column of photodiodes 11 overlaps collinearly with the light-receiving areas 111 of two adjacent photodiodes 11 in the adjacent column. In this structure, there are no gaps between the light-receiving areas 111 of the photodiodes 11. Regardless of the location of the laser beam, the optical receiver 1 can identify and determine the specific location of the signal. Furthermore, because the photodiodes 11 are independent entities, blind spots are minimized, making position determination more accurate and preventing missed detections.

[0035] like Figure 2 As shown, the optical receiver 1 provided by the present invention performs the following steps during detection:

[0036] (1) Calibrate the photodiode height range;

[0037] Fix the optical receiver 1 on a standard height ruler and use a standard light source to emit light at the center of the nth photodiode. Mark the center points of the two photodiodes adjacent to the nth photodiode, that is, mark the center of the (n-1)th photodiode as point A and the center of the (n+1)th photodiode as point C. Amplify the signal through a transimpedance amplifier circuit and convert the optical signals at points A and C into electrical signals. Record the electrical signal amplitudes at points A and C as V, respectively. a and V c , calculate the signal ratio X according to formula (1):

[0038]

[0039] When X=0, the position at this time is calibrated as the center position of the nth photodiode, which is recorded as X0.

[0040] Move the standard height gauge upward by 1 mm and calculate the signal ratio between point A and point C according to formula (1), which is recorded as X -1 ; Continue to move upward 1mm, and calculate the signal ratio of point A and point C according to formula (1) again, and record it as X -2 ; Similarly, the calibration value range of the lower part of the center position of the nth photodiode is formed: X -1 , X -2 , X -3 ,……,X -m , where m satisfies:

[0041]

[0042] L is the light receiving length of the light receiving area of the photodiode, and formula (2) shows that m is not more than The maximum integer.

[0043] Similarly, reset the standard height gauge and move it downward by 1 mm. Calculate the signal ratio between point A and point C according to formula (1), and record it as X +1 ; Continue to move upward 1mm, and calculate the signal ratio of point A and point C according to formula (1) again, and record it as X +2 ; Similarly, the calibration value range of the upper part of the center position of the nth photodiode is formed: X +1 , X +2 , X +3 ,……,X +m . Where m satisfies formula (2).

[0044] (3) Detect and calculate the laser light position;

[0045] A laser projector is used to project laser light to the optical receiver 1. Each photodiode in the optical receiver 1 receives the laser signal and amplifies it into an electrical signal through a transimpedance amplifier circuit. The electrical signal amplitude of each photodiode is recorded and recorded as V1, V2, V3...V e , where e is the total number of photodiodes in the optical receiver 1. And determine V1~V e The maximum value V f , the position D of the laser light is determined by calculation according to formula (3):

[0046]

[0047] Where f represents the number of the photodiode corresponding to the maximum amplitude of the electrical signal;

[0048] L represents the light receiving length of the light receiving area of each of the photodiodes.

[0049] Then, the relative position H of the laser light is calculated according to equations (4) and (5):

[0050] H=D―(f―1)×K Formula (4)

[0051]

[0052] when When , the position of the laser light is at the center of the f-th photodiode;

[0053] when When the laser beam is located at the upper position of the f-th photodiode, then X f The height range X calibrated in step (2) +1 , X +2 , X +3 ,……,X +m , and by comparison, the specific position of the laser light can be obtained, accurate to 1mm;

[0054] when When the laser beam is located at the lower part of the f-th photodiode, then X f The height range X calibrated in step (2) -1 , X -2 , X -3 ,……,X -m , by comparison, the specific position of the laser light can be obtained, accurate to 1mm.

[0055] Through the above detection method, the optical receiver 1 can accurately determine the position of the laser light, and the coordinates of the position can be accurate to 1mm.

[0056] The optical receiver 1 provided by the present invention can be used in an optical receiving sensor, and the optical receiving sensor is used in conjunction with a laser line projector.

[0057] Although the present invention has been disclosed above with reference to the embodiments, they are not intended to limit the present invention. Anyone with ordinary skill in the art may make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the appended patent applications.

Claims

1. An optical receiver detection method, characterized in that: The optical receiver includes at least two columns of photodiodes, and the photodiodes in adjacent columns are arranged in a staggered manner. Detection is performed according to the following steps: (1) calibrating the photodiode height range; Fixing the light receiver on a standard height ruler, using a standard light source to align the center position of the nth photodiode, and calculating the ratio of the electrical signal amplitudes at the center positions of the (n+1)th and (n-1)th photodiodes respectively; Starting from the center position of the nth photodiode, the standard height ruler is moved upward and downward respectively, and the ratio of the electrical signal amplitude at the center position of the (n+1)th photodiode and the (n-1)th photodiode is recorded in sequence to form a calibration value range; (2) Detect and calculate the laser light position; Project the laser onto the optical receiver, record the electrical signal amplitude of each photodiode, determine the maximum electrical signal amplitude, calculate the position of the laser light, and determine the relative position of the laser light on the optical receiver based on the calibration value range in step (1).

2. The optical receiver detection method according to claim 1, wherein: The light receiving area of the photodiode is collinearly overlapped with the light receiving areas of two upper and lower adjacent photodiodes in adjacent columns.

3. The optical receiver detection method according to claim 2, wherein: The method for calculating the ratio of the electrical signal amplitudes at the center positions of the (n+1)th and (n-1)th photodiodes in step (1) is: V a is the electrical signal amplitude at the center position of the (n-1)th photodiode, V c is the electrical signal amplitude at the center position of the (n+1)th photodiode.

4. The optical receiver detection method according to claim 3, wherein: In step (1), the standard height gauge moves 1 mm each time, and moves up and down m times respectively, where m is no more than The maximum integer of , L is the light receiving length of the photodiode.

5. The optical receiver detection method according to claim 4, wherein: The method for calculating the position of the laser light in step (2) is: f is the number of the photodiode corresponding to the maximum amplitude of the electrical signal, and L is the light receiving length of the photodiode.

6. The optical receiver detection method according to claim 5, characterized in that: The method for calculating the relative position of the laser light on the light receiver in step (2) is: H=D―(f―1)×K, X f is the ratio of the electrical signal amplitude at the center of the fth photodiode, V f+1 is the electrical signal amplitude at the center of the (f+1)th photodiode, V f-1 is the electrical signal amplitude at the center position of the (f-1)th photodiode; when When , the position of the laser light is located at the center position of the f-th photodiode; when When the laser beam is positioned above the f-th photodiode, X f Compare with the calibration value range determined in step (2); when When the laser beam is positioned at the lower portion of the f-th photodiode, X f Compare with the calibration value range determined in step (2).

7. The light receiving sensor comprises a light receiver, wherein the light receiver comprises at least two columns of photodiodes, wherein the photodiodes in adjacent columns are arranged in a staggered manner, and wherein: The optical receiver detects the position of the laser light according to the detection method according to any one of claims 1 to 6.

8. Laser line projector, characterized in that, Used in conjunction with the light receiving sensor as claimed in claim 7.

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