A photoelectric speed sensor calibration device and calibration method

Abstract

The present invention relates to a device and method for calibrating a photoelectric speed sensor. The device comprises a base provided with a support column and a fixed column provided at the end of the base. A connecting rod provided with a pendulum is connected to the top of the support column. A standard photoelectric speed sensor and a photoelectric speed sensor to be measured are clamped by a U-shaped clamp of the pendulum. A circular track is also fixed on the base. A plurality of pairs of photoelectric gate cutting plates arranged on the left and right sides of the circular track have U-shaped cross-sections at the places where they are bent toward the inner side of the circular track, forming a gap channel. The pendulum rotates and swings back and forth around the connecting rod in the gap channel. Standard signals U and measurement signals u corresponding to the standard photoelectric speed sensor and the photoelectric speed sensor to be measured are synchronously collected. During each movement of the pendulum, the standard signal U and the measurement signal u generate a series of corresponding Vi, vi. Vi is the standard value corresponding to vi, and its deviation is the measurement error of the photoelectric speed sensor to be measured.

Description

Technical Field

[0001] The invention relates to a sensor calibration device, and in particular discloses a photoelectric speed sensor calibration device and a calibration method, which are suitable for calibrating the photoelectric speed sensor in the measurement and detection industry. Background Art

[0002] Photoelectric speed sensors are widely used to measure instantaneous speed in object motion, impact, and collision tests. In these tests, the instantaneous speed measurement results reflect the specific state of the object, and the accuracy of the measurement results determines the quality of the test. Therefore, the accuracy of the photoelectric speed sensor itself must be confirmed to determine whether it meets the test requirements. However, there is currently no calibration device for photoelectric speed sensors in this field, so it is necessary to design a calibration device for photoelectric speed sensors. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that there is no calibration device for photoelectric speed sensors in the prior art, and to design a photoelectric speed sensor calibration device and calibration method to confirm the performance indicators of the photoelectric speed sensor and provide correction values ​​to reduce measurement errors.

[0004] The present invention is implemented as follows: a device and method for calibrating a photoelectric speed sensor, characterized in that the device comprises a base, a right support column and a left support column arranged at both sides of the base, and a fixed column arranged at the end of the base, the right support column and the left support column are respectively provided with through holes for passing a connecting rod at the top, a pendulum is provided on the connecting rod, and an end of the pendulum away from the connecting rod is provided as a U-shaped clamp for clamping a standard photoelectric speed sensor and a photoelectric speed sensor to be measured, an annular track is also fixed on the base, a plurality of pairs of photoelectric gate cutting plates are provided on the annular track, at least one pair is provided, the photoelectric gate cutting plates are a pair of L-shaped baffles arranged on both sides of the annular track, grooves are provided on the baffles bent to the inner side of the annular track, the cross section of the baffle is U-shaped, and a plurality of pairs of photoelectric gate cutting plates arranged on the left and right sides of the annular track form a gap channel, the pendulum is movably connected to the connecting rod, and the pendulum is realized in a working state of rotating and swinging back and forth around the connecting rod in the gap channel.

[0005] The right support column and the left support column are symmetrically arranged, with the same structure and equal size. The two sides of the U-shaped clamp respectively clamp the standard photoelectric speed sensor and the photoelectric speed sensor to be measured. The fixed column is provided with a plurality of through holes for inserting the positioning pins. The positioning pins are located higher than the top of the circular track, and their length is one end passing through the through hole on the fixed column and the other end against the pendulum. The bottom surface of the middle section of the circular track is set as a platform; the photoelectric gate cutting plates arranged on both sides of the circular track have the same structure and equal size, and are symmetrically evenly distributed on both sides of the right support column and the left support column. The side width of the U-shaped baffle cross-section is d, and the opening distance between the two sides is D, and this distance D is less than the spacing distance between an adjacent pair of photoelectric gate cutting plates.

[0006] The specific steps of the calibration method of the photoelectric speed sensor calibration device are as follows:

[0007] S1, sequentially numbering the plurality of pairs (n pairs) of photoelectric gate cutting plates arranged on both sides of the circular track from 1 to n;

[0008] S2. Initially, the pendulum is rotated around the connecting rod to an angle higher than the circular track, and then fixed at this initial angle by a fixing pin;

[0009] S3. Install sensors at the U-shaped clamp of the pendulum, one side of which is a standard photoelectric speed sensor and the other side is a photoelectric speed sensor to be tested;

[0010] S4, pull out the fixing pin to release the pendulum;

[0011] S5. The standard photoelectric speed sensor and the photoelectric speed sensor to be tested rotate and swing synchronously with the pendulum. Each time the standard photoelectric speed sensor and the photoelectric speed sensor to be tested pass through a pair of photoelectric gate cutting plates, the signal will change. The data acquisition card connected to the standard photoelectric speed sensor and the photoelectric speed sensor to be tested through electrical signals records the signal of the standard photoelectric speed sensor as the standard signal U and the signal of the photoelectric speed sensor to be tested as the measurement signal u, and transmits them to the data processor, which processes and saves the data.

[0012] S6, respectively extract the time points T1 and T2 of each time the photoelectric gate cuts the board distance D in the standard signal U to obtain the time interval Ti, and measure the time points t1 and t2 of each time the photoelectric gate cuts the board distance D in the signal u to obtain the time interval ti;

[0013] S7, calculate D / Ti, D / ti corresponding to the swing speeds Vi, vi of the standard photoelectric speed sensor and the photoelectric speed sensor to be measured, respectively. Each set of valid Vi, vi should satisfy: T1>T, T2>T; tt1>T, t2>t;

[0014] S8. Linear fitting is performed on Vi and vi obtained from several measurements to obtain v=k*V+b, and a correction curve of the photoelectric speed sensor to be tested is calculated when in use. Subsequently, this correction curve is substituted into the measurement data measured by the photoelectric speed sensor to be tested for data calibration, so that the correct measurement result can be obtained.

[0015] During the calibration data acquisition process, the standard signal U and the measurement signal u corresponding to the standard photoelectric speed sensor and the photoelectric speed sensor to be tested are collected synchronously. During each pendulum movement, there is a series of one-to-one corresponding Vi and vi in ​​the standard signal U and the measurement signal u. Vi is the standard value corresponding to vi, and its deviation is the measurement error of the photoelectric speed sensor to be tested. By fitting the speed of each point, the deviation of other unmeasured speeds can be estimated by fitting the curve. If the maximum speeds of Vi and vi do not meet the requirements, the initial angle of the pendulum is increased by further raising the pendulum or the pendulum is directly raised to a further height by releasing the latch to obtain a larger initial velocity, and then repeating steps S5 to S8.

[0016] The beneficial effects of the present invention are as follows: the present invention drives the standard photoelectric speed sensor and the photoelectric speed sensor to be tested to move synchronously by the pendulum, and installs multiple photoelectric gate cutting plates at different positions passed by. One pendulum rotation movement can provide multiple different instantaneous standard speeds, and the performance index of the photoelectric speed sensor can be quickly confirmed. It can conveniently and quickly provide a correction value for the photoelectric speed sensor to be tested to reduce the measurement error. At the same time, for each fixed position of the photoelectric cutting plate, different instantaneous standard speeds can be provided by adjusting the initial angle of the pendulum, which can simultaneously meet the requirements of multi-point measurement and single-point measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the measuring device of the present invention.

[0018] Figure 2 Schematic diagram of the linear cutting plates and their spacing distance D.

[0019] Figure 3 It is the standard signal U of the standard photoelectric speed sensor.

[0020] Figure 4 It is the measurement signal u of the photoelectric speed sensor to be tested.

[0021] Figure 5 It is a schematic diagram of the relationship between the time interval T that the photoelectric gate cuts the board through in the standard signal U and the previous and next time intervals T1 and T2.

[0022] Figure 6 It is a schematic diagram of the relationship between the time interval t that the photoelectric gate cuts the board through in the measurement signal u and the previous and next time intervals t1 and t2.

[0023] Figure 7 It is a fitting curve diagram of the measurement result V of the standard photoelectric speed sensor and the measurement result v of the photoelectric speed sensor to be measured, which are calculated by the standard signal U and the measurement signal u.

[0024] In the figure: 1. Base; 2. Right support column; 3. Left support column; 4. Connecting rod; 5. Pendulum; 6. Standard photoelectric speed sensor; 7. Photoelectric speed sensor to be tested; 8. Circular track; 9. Photoelectric gate cutting plate; 10. Positioning pin; 11. Fixed column. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] According to the attached Figure 1 The present invention is a device and method for calibrating a photoelectric speed sensor. The device comprises a base 1, a right support column 2 and a left support column 3 arranged at two sides of the base 1, and a fixed column 11 arranged at the end of the base 1. The right support column 2 and the left support column 3 are symmetrically arranged, have the same structure and are equal in size, and are respectively provided with through holes at the top for passing a connecting rod 4. A pendulum 5 is provided on the connecting rod 4. The end of the pendulum 5 away from the connecting rod 4 is provided as a U-shaped clamp. The two sides of the U-shaped clamp are respectively used to clamp a standard photoelectric speed sensor and a photoelectric speed sensor to be measured. A plurality of through holes for inserting positioning pins 10 are provided along the vertical direction of the fixed column 11. A circular track 8 is also fixed on the base 1. The circular track 8 The bottom surface of the middle section is set as a platform so that it can remain stable when fixed on the base 1. The circular track 8 is provided with a plurality of pairs of photoelectric gate cutting plates 9. The photoelectric gate cutting plates 9 are a pair of L-shaped baffles with the same structure and equal size arranged on both sides of the circular track 8, wherein grooves are provided on the baffles bent to the inner side of the circular track 8, so that the cross-section of the baffle here is U-shaped, and a plurality of pairs of photoelectric gate cutting plates 9 are symmetrically arranged on both sides of the right support column 2 and the left support column 3. The pendulum 5 is movably connected to the connecting rod 4 and can rotate and swing back and forth around the connecting rod 4 in the gap channel formed by the plurality of pairs of photoelectric gate cutting plates 9 arranged on the left and right sides of the circular track 8. The positioning pin 10 is located above the top of the circular track 8, and its length is one end passing through the through hole on the fixing column 11, and the other end abuts against the pendulum 5. According to the attached Figure 2 The width of the side of the U-shaped baffle cross section is d, and the size of the opening, that is, the distance between the two side edges is D, and this distance D is much smaller than the spacing distance between an adjacent pair of photoelectric gate cutting plates 9.

[0027] The specific steps of the calibration method of the photoelectric speed sensor calibration device of the present invention are as follows:

[0028] S1, sequentially numbering the plurality of pairs (n pairs) of photoelectric gate cutting plates 9 arranged on both sides of the circular track 8 from 1 to n;

[0029] S2. Initially, the pendulum 5 is rotated around the connecting rod 4 to an angle higher than the annular track 8, and then fixed at this initial angle by the fixing pin 10;

[0030] S3, installing sensors at the U-shaped clamp of the pendulum 5, one side of which is a standard photoelectric speed sensor 6, and the other side is a photoelectric speed sensor to be measured 7, that is, in the calibration data collection process, the standard signal U and the measurement signal u corresponding to the standard photoelectric speed sensor 6 and the photoelectric speed sensor to be measured 7 are synchronously collected;

[0031] S4, pull out the fixing pin 10 to release the pendulum 5;

[0032] S5, the standard photoelectric speed sensor 6 and the photoelectric speed sensor to be measured 7 rotate and swing with the pendulum 5. Each time the standard photoelectric speed sensor 6 and the photoelectric speed sensor to be measured 7 pass through a pair of photoelectric gate cutting plates 9, the signal will change. The standard photoelectric speed sensor 6 and the photoelectric speed sensor to be measured 7 are connected to the data acquisition card through electrical signals. The data acquisition card records the signal of the standard photoelectric speed sensor 6 as the standard signal U and the signal of the photoelectric speed sensor to be measured 7 as the measurement signal u, see attached Figure 3 and attached Figure 4 and transmit it to a data processor, which processes and stores the data;

[0033] S6, respectively extract the time points T1 and T2 of each time the photoelectric gate cuts the board distance D in the standard signal U to obtain the time interval Ti, and measure the time points t1 and t2 of each time the photoelectric gate cuts the board distance D in the signal u to obtain the time interval ti;

[0034] S7, calculate D / Ti, D / ti corresponding to the swing speeds Vi, vi of the standard photoelectric speed sensor 6 and the photoelectric speed sensor to be measured 7 respectively, and each set of valid Vi, vi should satisfy: T1>T, T2>T; tt1>T, t2>t;

[0035] S8. Linear fitting is performed on Vi and vi obtained from several measurements to obtain v=k*V+b, and a correction curve of the photoelectric speed sensor 7 to be tested is calculated when in use. Subsequently, this correction curve is substituted into the measurement data measured by the photoelectric speed sensor 7 to be tested for data calibration, so that the correct measurement result can be obtained.

[0036] When collecting calibration data, if the maximum speeds of Vi and vi do not meet the requirements, the pendulum 5 can be further raised, that is, the initial angle of the pendulum 5 can be increased. The pendulum 5 can also be raised to a further height manually after releasing the latch 10 to obtain a larger initial speed, and then the above steps S5 to S8 are repeated.

Claims

1. A device for calibrating a photoelectric speed sensor, characterized in that: The photoelectric speed sensor calibration device includes a base, a right support column and a left support column arranged on both sides of the base, and a fixed column arranged at the end of the base, the right support column and the left support column are respectively provided with through holes at the top for passing the connecting rod, the connecting rod is provided with a pendulum, and the end of the pendulum away from the connecting rod is arranged as a U-shaped clamp for clamping a standard photoelectric speed sensor and a photoelectric speed sensor to be tested, and an annular track is also fixed on the base, and a plurality of pairs of photoelectric gate cutting plates are arranged on the annular track, and the photoelectric gate cutting plates are a pair of L-shaped baffles arranged on both sides of the annular track, wherein grooves are provided on the baffles bent toward the inner side of the annular track, and the cross-section of the baffle is U-shaped, and a plurality of pairs of photoelectric gate cutting plates arranged on the left and right sides of the annular track form a gap channel, and the pendulum is movably connected to the connecting rod to realize the working state of the pendulum rotating and swinging back and forth around the connecting rod in the gap channel.

2. The device for calibrating a photoelectric speed sensor according to claim 1, characterized in that: The right support column and the left support column are symmetrically arranged, with the same structure and equal size; the U-shaped clamp clamps the standard photoelectric speed sensor and the photoelectric speed sensor to be tested on both sides respectively; the fixed column is provided with a plurality of through holes for inserting positioning pins; the bottom surface of the middle section of the circular track is set as a platform; the photoelectric gate cutting plates arranged on both sides of the circular track have the same structure and equal size, and are symmetrically distributed on both sides of the right support column and the left support column, the side width of the U-shaped cross-section of the baffle is d, the opening distance between the two side edges is D, and this distance D is smaller than the spacing distance between an adjacent pair of photoelectric gate cutting plates.

3. The device for calibrating a photoelectric speed sensor according to claim 2, characterized in that: The positioning pin is located above the apex of the annular track, and its length is such that one end passes through the through hole on the fixing column and the other end abuts against the pendulum; at least one pair of photoelectric gate cutting plates is provided.

4. A calibration method using the photoelectric speed sensor calibration device according to any one of claims 1 to 3, characterized in that The specific steps are as follows: S1, sequentially numbering the plurality of pairs (n pairs) of photoelectric gate cutting plates arranged on both sides of the circular track from 1 to n; S2. Initially, the pendulum is rotated around the connecting rod to an angle higher than the circular track, and then fixed at this initial angle by a fixing pin; S3. Install sensors at the U-shaped clamp of the pendulum, one side of which is a standard photoelectric speed sensor and the other side is a photoelectric speed sensor to be tested; S4, pull out the fixing pin to release the pendulum; S5, the standard photoelectric speed sensor and the photoelectric speed sensor to be tested rotate and swing synchronously with the pendulum. Each time the standard photoelectric speed sensor and the photoelectric speed sensor to be tested pass through a pair of photoelectric gate cutting plates, the signal will change. The data acquisition card connected to the standard photoelectric speed sensor and the photoelectric speed sensor to be tested through electrical signals records the signal of the standard photoelectric speed sensor as the standard signal U and the signal of the photoelectric speed sensor to be tested as the measurement signal u, and transmits them to the data processor, which processes and saves the data; S6, respectively extract the time points T1 and T2 of each time the photoelectric gate cuts the board distance D in the standard signal U to obtain the time interval Ti, and measure the time points t1 and t2 of each time the photoelectric gate cuts the board distance D in the signal u to obtain the time interval ti; S7, calculate D / Ti, D / ti corresponding to the swing speeds Vi, vi of the standard photoelectric speed sensor and the photoelectric speed sensor to be measured, respectively. Each set of valid Vi, vi should satisfy: T1>T, T2>T; tt1>T, t2>t; S8. Linearly fit Vi and vi obtained from several measurements to obtain v=k*V+b, and calculate the correction curve of the photoelectric speed sensor to be tested when in use. Subsequently, this correction curve is substituted into the measurement data measured by the photoelectric speed sensor to be tested for data calibration to obtain the correct measurement result.

5. The calibration method of the photoelectric speed sensor calibration device according to claim 4, characterized in that: During the calibration data acquisition process, if the maximum speeds of Vi and vi do not meet the requirements, the initial angle of the pendulum is increased by further raising the pendulum or the pendulum is directly raised to a further height manually after releasing the latch to obtain a larger initial speed, and then steps S5 to S8 are repeated.

6. The calibration method of the photoelectric speed sensor calibration device according to claim 4, characterized in that: During the calibration data acquisition process, the standard signal U and the measurement signal u corresponding to the standard photoelectric speed sensor and the photoelectric speed sensor to be measured are acquired synchronously.

Images