Laser rotation speed measuring device and method, electronic device

Abstract

The application relates to the field of laser speed measurement, and provides a laser rotating speed measurement device and method and an electronic device. The device comprises: a code disc, which is in a ring structure, is sleeved on a rotating device to be measured, and is coaxially arranged with the rotating device to be measured; a laser rotating speed sensor, which is arranged outside the code disc and is spaced apart from the code disc by a certain distance; the code disc comprises a first half region and a second half region; the laser rotating speed sensor is used for emitting laser to the code disc, receiving reflected laser of the code disc, and determining rotating speed and rotating direction of the code disc based on the reflected laser, wherein the rotating speed of the code disc represents rotating speed of the rotating device to be measured, and the rotating direction of the code disc represents the rotating direction of the rotating device to be measured. The scheme is used to solve the defect that related technologies cannot measure the rotating direction of an object, and the rotating direction is judged through the difference between reflected light of two code discs.

Description

Technical Field

[0001] This invention relates to the field of laser velocimetry technology, and in particular to a laser rotation speed measuring device and method, and an electronic device. Background Technology

[0002] Laser rotational speed measurement involves illuminating a reflective mark or inherent feature on a rotating object with a laser beam. When the reflective mark passes by, the reflected light is received by a photoelectric sensor, generating a pulse signal. By calculating the number of pulses per unit time, the rotational speed can be determined.

[0003] In existing technologies, laser rotation speed measurement can mostly only calculate the rotation speed of the object being measured, but cannot determine the direction of rotation, thus failing to meet practical needs. Summary of the Invention

[0004] This invention provides a laser rotation speed measuring device and method, and an electronic device, to solve the deficiency of related technologies that cannot measure the rotation direction of an object. The solution of this application is to set up two code disks and determine the rotation direction by the difference in reflected light between the two code disks.

[0005] This invention provides a laser rotation speed measuring device, comprising: The code disk is a ring structure and is sleeved on the rotating device under test. The code disk and the rotating device under test are coaxially arranged. A laser rotation speed sensor is disposed on the outside of the code disk, at a predetermined distance from the code disk; The code disk includes a first half-area and a second half-area. The first half-area includes a plurality of first bright areas and a plurality of first dark areas. The first bright areas reflect light when illuminated, while the first dark areas do not reflect light when illuminated. The second half-area includes a plurality of second bright areas and a plurality of second dark areas. The second bright areas reflect light when illuminated, while the second dark areas do not reflect light when illuminated. The laser rotation speed sensor is used to emit laser light to the code disk and receive the reflected laser light from the code disk, and to determine the rotation speed and rotation direction of the code disk based on the reflected laser light. The rotation speed of the code disk represents the rotation speed of the rotating device under test, and the rotation direction of the code disk represents the rotation direction of the rotating device under test.

[0006] According to the laser rotation speed measuring device provided by the present invention, the laser rotation speed sensor is further used for: A high level is generated when the reflected laser from the code disk is received, and a low level is generated when the reflected laser from the code disk is not received. The rotational speed of the rotating device under test is determined based on the changes in high and low voltage levels.

[0007] According to the laser rotation speed measuring device provided by the present invention, the laser rotation speed sensor includes a light-emitting device and a light-receiving device: The light-emitting device is used to emit laser light to the code disk; The light-receiving device is used to receive the reflected laser light from the code disk.

[0008] According to the laser rotation speed measuring device provided by the present invention, a plurality of first bright areas and a plurality of first dark areas are distributed at intervals on the first half-region; Several second bright areas and several second dark areas are distributed alternately on the second half-area.

[0009] According to the laser rotation speed measuring device provided by the present invention, the first half-region and the second half-region are 90 degrees out of phase.

[0010] According to the laser rotation speed measuring device provided by the present invention, the light-emitting device includes a laser diode.

[0011] According to the laser rotation speed measuring device provided by the present invention, the reflection angle of the reflected laser is 20 degrees.

[0012] The present invention also provides a laser rotation speed measurement method, which utilizes a laser rotation speed measurement device, comprising: The reflected laser is obtained by reflecting the code disk under the trigger of laser irradiation; A pulse signal is generated based on the reflected laser; Based on the pulse signal, the rotational speed of the rotating device under test is measured and determined.

[0013] According to the laser rotation speed measurement method provided by the present invention, the step of generating a pulse signal based on the reflected laser includes: A high level is generated when the reflected laser is triggered, and a low level is generated when the reflected laser is not present.

[0014] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement any of the laser rotation speed measurement methods described above.

[0015] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the laser rotation speed measurement methods described above.

[0016] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements any of the laser rotation speed measurement methods described above.

[0017] The laser rotation speed measuring device provided by this invention has at least the following beneficial effects: Non-contact speed measuring instruments, compared to contact-based laser speed measurement, can avoid friction and wear between objects, thereby extending the lifespan of the objects; It has high precision and can obtain relevant parameters of the measured object with an accuracy of 0.01 rpm, reducing errors and uncertainty in measurement results; It has high stability and a wide range of applications, and can be used for performance testing of high-speed rotating machinery. It supports phase difference output during forward and reverse rotation, thereby determining the direction and speed of rotation of the rotating device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the laser rotation speed measuring device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the light-emitting circuit provided in an embodiment of the present invention; Figure 3 This is one of the structural schematic diagrams of the light-receiving circuit provided in the embodiments of the present invention; Figure 4 This is a second schematic diagram of the structure of the light-receiving circuit provided in the embodiment of the present invention; Figure 5 This is a schematic diagram of the signal processing circuit provided in an embodiment of the present invention; Figure 6 This is a schematic flowchart of the laser rotation speed measurement method provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the physical structure of the electronic device provided in an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] Figure 1 This is a schematic diagram of the structure of the laser rotation speed measuring device provided in an embodiment of the present invention.

[0022] like Figure 1 As shown, this embodiment provides a laser rotation speed measuring device, including: The code disk is a ring structure and is sleeved on the rotating device under test. The code disk and the rotating device under test are coaxially arranged. A laser rotation speed sensor is disposed on the outside of the code disk, at a predetermined distance from the code disk; The code disk includes a first half-area and a second half-area. The first half-area includes a plurality of first bright areas and a plurality of first dark areas. The first bright areas reflect light when illuminated, while the first dark areas do not reflect light when illuminated. The second half-area includes a plurality of second bright areas and a plurality of second dark areas. The second bright areas reflect light when illuminated, while the second dark areas do not reflect light when illuminated. For example, the reflection angle of a reflected laser can be 20 degrees.

[0023] Several first bright areas and several first dark areas are distributed at intervals on the first half-region; Several second bright areas and several second dark areas are distributed alternately on the second half-area.

[0024] Furthermore, the phases of the first half-region and the second half-region can differ by 90 degrees.

[0025] The laser rotation speed sensor is used to emit laser light to the code disk and receive the reflected laser light from the code disk, and to determine the rotation speed and rotation direction of the code disk based on the reflected laser light. The rotation speed of the code disk represents the rotation speed of the rotating device under test, and the rotation direction of the code disk represents the rotation direction of the rotating device under test.

[0026] In practical applications, the laser speed sensor is also used for: A high level is generated when the reflected laser from the code disk is received, and a low level is generated when the reflected laser from the code disk is not received. The rotational speed of the rotating device under test is determined based on the changes in high and low voltage levels.

[0027] The laser speed sensor includes a light-emitting device and a light-receiving device: The light-emitting device is used to emit laser light to the code disk; The light-receiving device is used to receive the reflected laser light from the code disk.

[0028] The light-emitting device may include a laser diode. In one specific embodiment, the circuit structure of the light-emitting device is as follows: Figure 2As shown, the light-emitting circuit consists of resistors, potentiometers, transistors, and a laser diode. A 5V VCC power supply powers the circuit. D1 and D2 are laser diodes. Resistors R8 and R14 have a resistance of 1.5kΩ to prevent damage to the laser diodes due to excessive brightness when powered on. Resistors R9 and R15 are left unsoldered by default; instead, variable resistors R11 and R16 are soldered directly. Changing the value of the variable resistors alters the brightness of the laser diodes; a larger variable resistor value dims the diode. Resistors R6 and R12 provide temperature negative feedback protection; as the temperature rises, the diode's brightness remains essentially unchanged, preventing damage to the components. Resistors R7 and R13 ensure the transistors are always in amplification mode, allowing them to operate normally.

[0029] The circuit structure of the light-receiving device is as follows Figure 3 As shown, the circuit is powered by a 5V DC power supply. L2 (BLM18HE152SN1D) is a ferrite bead, which, together with capacitor C5, forms an LC filter circuit specifically for suppressing noise and spike interference on the power line. Resistor R1 is connected in series with the light-receiving element LED1 for voltage division and current limiting. The voltage across the light-receiving element is denoted as SIGLE1IN. The light-receiving element LED1 (VEMD5510C) is a high-speed, high-sensitivity photodiode, a thin surface-mount device (SMD) with a 7.5 mm² photosensitive area. This photodiode has a peak sensitivity of 550 nm and exhibits extremely low capacitance at peak sensitivity.

[0030] The function of capacitor C1 is to filter and suppress spike interference. The other signal, SIGLE2IN, works similarly to SIGLE1IN. The schematic diagram of the light-receiving circuit is shown below. Figure 3 and Figure 4 As shown, where Figure 3 This is the light-receiving circuit corresponding to the first code disk. Figure 4 This is the light-receiving circuit corresponding to the second code disk.

[0031] In addition, the laser speed sensor also includes a signal processing circuit. This circuit can determine the rotational speed of the rotating device under test based on changes in high and low voltage levels. The structure of the signal processing circuit is as follows: Figure 5 As shown, SIGLEE1IN and SIGLEE2IN are input to Schmitt triggers U3 and U1 (74AHC1G17GVH) respectively. When the input voltages SIGLEE1IN and SIGLEE2IN are higher than the positive threshold voltage, the outputs SPS1 and SPS2 are high; when the input voltages SIGLEE1IN and SIGLEE2IN are lower than the negative threshold voltage, the outputs SPS1 and SPS2 are low. The positive threshold voltage of the 74AHC1G17GVH Schmitt trigger is higher than the negative threshold voltage. The purpose is to improve the circuit's anti-interference capability and filter out noise. Capacitors C5 and C2 are used for filtering.

[0032] The laser rotation speed measurement method provided by the present invention is described below. The laser rotation speed measurement method described below can be referred to in correspondence with the laser rotation speed measurement device described above.

[0033] Figure 6 This is a schematic flowchart of the laser rotation speed measurement method provided in an embodiment of the present invention.

[0034] like Figure 6 As shown, the laser rotation speed measurement method provided in this embodiment includes: Step 601: Obtain the reflected laser, wherein the reflected laser is obtained by the code disk reflecting the laser light when triggered by laser irradiation; Step 602: Generate a pulse signal based on the reflected laser; Step 603: Based on the pulse signal, measure and determine the rotational speed of the rotating device under test.

[0035] Specifically, step 602 is used for: A high level is generated when the reflected laser is triggered, and a low level is generated when the reflected laser is not present.

[0036] The specific implementation method of the laser rotation speed measurement method provided in this embodiment can be implemented with reference to the above embodiment, and will not be repeated here.

[0037] Figure 7 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 7 As shown, the electronic device may include: a processor 710, a communication interface 720, a memory 730, and a communication bus 740, wherein the processor 710, the communication interface 720, and the memory 730 communicate with each other via the communication bus 740. The processor 710 can call logical instructions in the memory 730 to execute a laser rotation speed measurement method, which includes: The reflected laser is obtained by reflecting the code disk under the trigger of laser irradiation; A pulse signal is generated based on the reflected laser; Based on the pulse signal, the rotational speed of the rotating device under test is measured and determined.

[0038] Furthermore, the logical instructions in the aforementioned memory 730 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0039] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the laser rotation speed measurement method provided by the above methods, the method comprising: The reflected laser is obtained by reflecting the code disk under the trigger of laser irradiation; A pulse signal is generated based on the reflected laser; Based on the pulse signal, the rotational speed of the rotating device under test is measured and determined.

[0040] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the laser rotation speed measurement method provided by the methods described above, the method comprising: The reflected laser is obtained by reflecting the code disk under the trigger of laser irradiation; A pulse signal is generated based on the reflected laser; Based on the pulse signal, the rotational speed of the rotating device under test is measured and determined.

[0041] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0042] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A laser rotation speed measuring device, characterized in that, include: The code disk is a ring structure and is sleeved on the rotating device under test. The code disk and the rotating device under test are coaxially arranged. A laser rotation speed sensor is disposed on the outside of the code disk, at a predetermined distance from the code disk; The code disk includes a first half-area and a second half-area. The first half-area includes a plurality of first bright areas and a plurality of first dark areas. The first bright areas reflect light when illuminated, while the first dark areas do not reflect light when illuminated. The second half-area includes a plurality of second bright areas and a plurality of second dark areas. The second bright areas reflect light when illuminated, while the second dark areas do not reflect light when illuminated. The laser rotation speed sensor is used to emit laser light to the code disk and receive the reflected laser light from the code disk, and to determine the rotation speed and rotation direction of the code disk based on the reflected laser light. The rotation speed of the code disk represents the rotation speed of the rotating device under test, and the rotation direction of the code disk represents the rotation direction of the rotating device under test.

2. The laser rotation speed measuring device according to claim 1, characterized in that, The laser speed sensor is also used for: A high level is generated when the reflected laser from the code disk is received, and a low level is generated when the reflected laser from the code disk is not received. The rotational speed of the rotating device under test is determined based on the changes in high and low voltage levels.

3. The laser rotation speed measuring device according to claim 1, characterized in that, The laser speed sensor includes a light-emitting device and a light-receiving device: The light-emitting device is used to emit laser light to the code disk; The light-receiving device is used to receive the reflected laser light from the code disk.

4. The laser rotation speed measuring device according to claim 1, characterized in that, Several first bright areas and several first dark areas are distributed at intervals on the first half-region; Several second bright areas and several second dark areas are distributed alternately on the second half-area.

5. The laser rotation speed measuring device according to claim 1, characterized in that, The first half-region and the second half-region are 90 degrees out of phase.

6. The laser rotation speed measuring device according to claim 3, characterized in that, The light-emitting device includes a laser diode.

7. The laser rotation speed measuring device according to claim 1, characterized in that, The reflection angle of the reflected laser is 20 degrees.

8. A laser rotation speed measurement method, using the laser rotation speed measurement device according to any one of claims 1-7, characterized in that, include: The reflected laser is obtained by reflecting the code disk under the trigger of laser irradiation; A pulse signal is generated based on the reflected laser; Based on the pulse signal, the rotational speed of the rotating device under test is measured and determined.

9. The laser rotation speed measurement method according to claim 8, characterized in that, The generation of pulse signals based on the reflected laser includes: A high level is generated when the reflected laser is triggered, and a low level is generated when the reflected laser is not present.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the laser rotation speed measurement method as described in any one of claims 8.

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