A laser power detection device and detection method

Abstract

A kind of laser power detection device and detection method, including laser transmission cylinder and respectively being located at laser output device and light transmission mirror of laser transmission cylinder two ends, the laser output device emits light beam in the laser transmission cylinder with preset divergence angle α transmission, transmission light beam forms the light transmission beam area distributed in middle portion and the scattered light beam area distributed in edge in laser transmission cylinder;PD photosensitive element is arranged in the laser transmission cylinder, the PD photosensitive element is arranged in scattered light beam area, the PD photosensitive element is fixed with preset inclination angle β towards the laser output device.This application is configured by being arranged in the laser transmission cylinder PD photosensitive element, and PD photosensitive element is configured in the scattered light beam area in inside, without affecting the light beam transmission condition of light transmission beam area, with smaller angle of incidence to photosensitive resistance to receive light beam, receive light beam more fully, reduce external interference, can sensitively capture abnormal fluctuation of laser power.

Description

Technical Field

[0001] This invention relates to the field of laser vision instrument technology, and in particular to a laser power detection device and detection method. Background Technology

[0002] With the continuous development of technology, electronic products such as mobile phones and computers are becoming increasingly popular, and more and more teenagers and children are becoming addicted to these electronic products, leading to a continuous decline in their eyesight. Some studies have shown that the incidence of myopia in teenagers and children is increasing year by year, while the age of onset of myopia is trending downward, meaning that more and more young children are suffering from myopia.

[0003] To alleviate vision symptoms, some patients use vision therapy devices or low-intensity laser therapy to improve their vision. These devices work by emitting light of a specific wavelength into the user's eyes, stimulating the cells in the retina to improve vision. However, existing devices lack real-time monitoring of the laser power during use. After a period of use, the laser power may decrease or become abnormal. Lasers with too low a power output are ineffective, while those with too high a power output can negatively impact the therapeutic effect. Therefore, developing a laser vision device that can monitor laser power during use and automatically adjust accordingly is a pressing problem that needs to be solved. Summary of the Invention

[0004] To address the problem that existing laser vision instruments lack laser power detection capabilities, this invention provides a laser power detection device and method. It utilizes a PD photosensitive element to receive the laser beam and obtain abnormal fluctuations in laser power. The PD photosensitive element is placed inside a laser transmission cylinder, resulting in a smaller angle at which the beam strikes the PD photosensitive element, allowing for more complete beam reception and improved detection efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a laser power detection device, comprising a laser transmission cylinder and a laser output device and a light transmission lens respectively disposed at both ends of the laser transmission cylinder, wherein the laser output device emits a light beam at a pre-set divergence angle α and transmits it within the laser transmission cylinder, wherein the transmitted light beam forms a light transmission beam region distributed in the middle and a light dispersion beam region distributed at the edge within the laser transmission cylinder.

[0006] The laser transmission cylinder is equipped with a PD photosensitive element, which is located in the diffused beam area and is fixed towards the laser output device at a preset tilt angle β.

[0007] Preferably, the preset divergence angle α is 5°-30°, and the preset tilt angle β is the angle between the plane of the PD photosensitive element and the cross section of the laser transmission cylinder perpendicular to the axial direction, with the tilt angle β being 5°-45°.

[0008] Preferably, the outer wall of the laser transmission cylinder has a through groove from the end where the laser output device is located to the other end, and forms a wiring groove with the sleeve body fitted on the laser transmission cylinder. The end of the through groove extends inward to form a through opening, and the PD photosensitive element extends into the laser transmission cylinder through the through opening and is fixed.

[0009] Preferably, the laser output device includes a laser circuit board, the laser circuit board is provided with a PCB flexible strip, one end of the PCB flexible strip extends into the wiring groove and is electrically connected to the PD photosensitive element.

[0010] Preferably, the laser output device includes a laser diode, the output end of which is located at the end of the laser transmission cylinder. The light-transmitting mirror has an aperture on the side near the laser diode. The boundary between the light-transmitting boundary and the light-emitting boundary of the laser diode output end forms the boundary between the light-transmitting beam region and the light-scattering beam region. The PD photosensitive element is located within the light-scattering beam region.

[0011] Preferably, the emitted beam from the light-transmitting beam region passes through the aperture and forms a light spot of a preset diameter at a fixed distance and fixed point.

[0012] Preferably, the PD photosensitive element is disposed inside the laser transmission cylinder and near the rear half of the light-transmitting lens to reduce external interference and fully capture voltage fluctuations inside the laser transmission cylinder, and the edges of the PD photosensitive element are all placed within the diffused light beam area.

[0013] On the other hand, the present invention adopts the following technical solution: a laser power detection method, applied to the above-mentioned laser power detection device, comprising the following steps:

[0014] The emitted beam is received by a PD photosensitive element configured inside the laser transmission cylinder, the voltage fluctuation is obtained, and the corresponding value of the laser power is obtained based on the voltage fluctuation. The emitted beam received by the PD photosensitive element is the emitted beam from the astigmatic beam region.

[0015] The laser power is detected by a pre-set voltage fluctuation threshold. When the voltage fluctuation exceeds the voltage fluctuation threshold, an abnormal laser power warning is issued and a corresponding laser power adjustment strategy is executed.

[0016] Preferably, the preset voltage fluctuation threshold includes a first voltage threshold and a second voltage threshold, and the voltage fluctuation between the first voltage threshold and the second voltage threshold is a normal voltage fluctuation;

[0017] When the voltage of the PD photosensitive element exceeds the normal voltage fluctuation, an abnormal laser power warning is issued, and the main control chip detects and corrects the error of the power supply voltage and current of the laser output device to ensure that the laser power output is normal.

[0018] The normal calibrated value for the laser power output is 1.2 ± 0.1 mW.

[0019] Preferably, the preset voltage fluctuation threshold also includes a third voltage threshold, which is higher than the first voltage threshold and the second voltage threshold. When the voltage of the PD photosensitive element is higher than the third voltage threshold, an alarm for abnormally high output laser power is triggered, and the main control chip stops supplying power to the laser output device, thus stopping the laser beam from being emitted.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This invention utilizes a small laser transmission cylinder with slots and through-holes to place the PD photosensitive element in the internal diffused beam region. Without affecting the beam transmission in the light-transmitting beam region, the light beam is received at a smaller angle to the photoresistor, resulting in more complete beam reception and more sensitive detection of abnormal fluctuations in laser power.

[0022] This invention is installed inside the laser transmission cylinder to reduce external interference and fully capture voltage fluctuations within the laser transmission cylinder, thereby improving detection accuracy.

[0023] This invention effectively monitors the laser generation process using a PD photosensitive element, detects abnormal laser power by detecting voltage fluctuations and provides early warnings, and detects and corrects errors by controlling the power supply voltage and current of the laser output device, so that the laser power output is normal and can adaptively monitor and adjust abnormal laser power. Attached Figure Description

[0024] To more clearly illustrate the technical solution, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of the present invention.

[0027] Figure 3 This is a schematic diagram of the transmission of the emitted beam of the present invention.

[0028] The markings in the diagram indicate:

[0029] 100: Laser transmission cylinder, 110: Transmitting beam area, 120: Scattering beam area, 200: Laser output device, 210: Through slot, 220: Through opening, 230: Laser circuit board, 240: PCB flexible strip, 300: Transmitting mirror, 400: Sleeve body, 500: PD photosensitive element. Detailed Implementation

[0030] In order to clearly and completely understand the technical solution, the present invention will be further described in conjunction with the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0034] like Figure 1-3 As shown, a laser power detection device includes a laser transmission cylinder 100 and a laser output device 200 and a light transmission lens 300 respectively disposed at both ends of the laser transmission cylinder 100. The laser output device 200 emits a light beam at a preset divergence angle α and transmits it within the laser transmission cylinder 100. The transmitted light beam forms a light-transmitting beam region 110 distributed in the middle and a light-scattering beam region 120 distributed at the edge within the laser transmission cylinder. A PD photosensitive element 500 is disposed within the laser transmission cylinder 100. The PD photosensitive element 500 is disposed in the light-scattering beam region 120 and faces the laser output device 200 and is fixed at a preset tilt angle β.

[0035] The preset divergence angle α is 5°-30°, and the preset tilt angle β is the angle between the plane of the PD photosensitive element and the cross section of the laser transmission cylinder perpendicular to the axial direction. The tilt angle β is 5°-45°. The tilt setting makes most of the light beams entering the PD photosensitive element 500 nearly vertical, and the light beams are received more fully.

[0036] The PD photosensitive element is disposed within the laser transmission cylinder, near the rear half of the light-transmitting lens, to reduce external interference and fully capture voltage fluctuations within the laser transmission cylinder. The edges of the PD photosensitive element are all positioned within the astigmatic beam area. Furthermore, placing the PD photosensitive element within the laser transmission cylinder effectively reduces external interference and improves detection accuracy.

[0037] The laser output device 200 includes a laser diode, the output end of which is located at the end of the laser transmission cylinder 100. The light-transmitting mirror 300 has an aperture 310 near the laser diode. The boundary between the light-transmitting boundary of the aperture 310 and the light-emitting boundary of the laser diode's output end defines the boundary between the light-transmitting beam region 110 and the light-scattering beam region 120. The PD photosensitive element 500 is located within the light-scattering beam region 120. Because the PD photosensitive element is located within the laser transmission cylinder and positioned within the light-scattering beam region, it does not affect the beam illumination in the light-transmitting beam region. The angle between the laser beam and the PD photosensitive element is small, resulting in more complete beam reception and more sensitive detection of abnormal fluctuations in laser power. The emitted beam from the light-transmitting beam region passes through the aperture 310 and forms a light spot of a preset diameter at a fixed distance and point.

[0038] In the preferred embodiment, the laser output device emits a laser beam with a divergence angle α, which passes through the aperture 310 to form a spot of a preset diameter at a fixed distance. The laser beam emitted by the laser output device has a certain divergence angle; an ideal divergence angle of 0° does not exist. In practical use, to obtain a spot of a certain diameter at the fixed distance and to ensure that the laser power of the spot meets the requirements, relatively large divergence angles, such as 20° and 25°, are selected. When a laser beam emitted at a larger divergence angle illuminates the PD photosensitive element, abnormal changes in laser power can be sensitively reflected by voltage fluctuations on the PD photosensitive element. In this embodiment, the corresponding value of laser power is obtained by monitoring this voltage fluctuation range, and a laser power adjustment strategy is used to ensure normal laser output. By adjusting the value of the aperture (optical device such as a grating), the laser beam emission is controlled to obtain a spot of the desired preset diameter at a certain distance.

[0039] In this embodiment, the outer wall of the laser transmission cylinder 100 has a through groove 210 extending from the end where the laser output device 200 is located towards the other end, forming a wiring groove with the sleeve body 400 fitted onto the laser transmission cylinder 200. The through groove 210 extends to a position in the middle, biased towards the light-transmitting lens 300, and penetrates inward to form a through opening 220. The PD photosensitive element 500 extends into the laser transmission cylinder 100 through the through opening 220 and is placed in the diffused beam area 120. The laser output device 200 includes a laser circuit board 230, and the laser circuit board 230 has a PCB flexible strip 240 that passes through the wiring groove and is electrically connected to the PD photosensitive element 500.

[0040] This implementation case involves creating through slots and openings in a small laser transmission cylinder to place the PD photosensitive element in the internal diffused beam area. Without affecting the beam transmission in the light-transmitting beam area, the beam is received with a smaller angle of illumination to the photoresistor, resulting in more complete beam reception and the ability to sensitively capture abnormal fluctuations in laser power.

[0041] On the other hand, this implementation case also provides another technical solution, a laser power detection method, including the following steps:

[0042] The voltage fluctuation is acquired, and the corresponding value of the laser power is obtained based on the voltage fluctuation. The acquisition of voltage fluctuation includes acquiring the voltage fluctuation on the PD photosensitive element when the beam emitted by the laser output device illuminates the PD photosensitive element. The beam received by the PD photosensitive element is the beam in the astigmatic beam region.

[0043] Laser power is detected by a pre-set voltage fluctuation threshold. When the voltage fluctuation exceeds the threshold, an abnormal laser power warning is issued, and a corresponding laser power adjustment strategy is executed, including:

[0044] The preset voltage fluctuation thresholds include a first voltage threshold, a second voltage threshold, and a third voltage threshold. Voltage fluctuations between the first and second voltage thresholds are considered normal voltage fluctuations, and the third voltage threshold is greater than the first and second voltage thresholds. When the voltage of the PD photosensitive element exceeds the normal voltage fluctuation, an abnormal laser power warning is issued. The main control chip detects and corrects errors in the power supply voltage and current of the laser output device to ensure normal laser power output. It should be noted that correcting errors to normalize laser power output can be achieved by adjusting the duty cycle using conventional techniques. The technical means for adjusting laser power are not detailed here.

[0045] Specifically, when the voltage of the PD photosensitive element is lower than the first voltage threshold, it indicates that the laser power is insufficient, and an abnormally low output laser power warning is issued. The main control chip detects and corrects errors in the power supply voltage and current of the laser output device to ensure that the laser power output is normal.

[0046] When the voltage of the PD photosensitive element is higher than the second voltage threshold but not higher than the third voltage threshold, it indicates that the laser power is too high. An abnormally high output laser power warning is issued, and the main control chip detects and corrects the error of the power supply voltage and current of the laser output device to make the laser power output normal.

[0047] When the voltage of the PD photosensitive element is higher than the third voltage threshold, an alarm is triggered indicating that the output laser power is abnormally high. The main control chip then stops supplying power to the laser output device, and the laser beam stops emitting.

[0048] As a preferred embodiment, the normal calibration value of the laser power output is 1.2 ± 0.1 mW.

[0049] This implementation case uses a PD photosensitive element to effectively monitor the laser generation process, and uses voltage fluctuations to judge abnormal laser power and issue early warnings. By controlling the power supply voltage and current of the laser output device, errors are detected and corrected to ensure normal laser power output. It can adaptively monitor and adjust abnormal laser power.

[0050] The above disclosures are merely one or more preferred embodiments of the present invention, intended to help understand the inventive concept of the technical solution, and are not intended to limit the present invention in any other way. Any other equivalent or conventional substitution schemes made by those skilled in the art based on the features defined by the present invention shall still fall within the scope of the present invention.

Claims

1. A laser power detection device, comprising a laser transmission cylinder and a laser output device and a light transmission mirror respectively arranged at both ends of the laser transmission cylinder, characterized in that: The laser output device emits a light beam with a preset divergence angle α in the laser transmission cylinder, and the transmission light beam forms a light-transmitting light beam area distributed in the middle and a scattered light beam area distributed in the edge in the laser transmission cylinder; The PD photosensitive element is arranged in the laser transmission cylinder and is fixed at a preset inclination angle β towards the laser output device; The preset divergence angle α is 5°-30°, and the preset inclination angle β is the included angle between the plane of the PD photosensitive element and the cross section of the laser transmission cylinder perpendicular to the axial direction, and the inclination angle β is 5°-45°; An outer wall of the laser transmission cylinder is provided with a through groove from the end where the laser output device is located towards the other end, and a wiring groove is formed with a sleeve body sleeved on the laser transmission cylinder, and a through hole is formed at the end of the through groove towards the inside, and the PD photosensitive element is fixed in the laser transmission cylinder through the through hole.

2. The laser power detection device of claim 1, wherein: The laser output device comprises a laser circuit board provided with a PCB flexible belt, one end of the PCB flexible belt is inserted into the wiring groove, and the PCB flexible belt is electrically connected with the PD photosensitive element.

3. The laser power detection device of claim 1, wherein: The laser output device comprises a laser diode, an output end of the laser diode is arranged at the end of the laser transmission cylinder, a diaphragm is arranged on the side close to the laser diode of the light-transmitting lens, a boundary for light transmission in the diaphragm to a boundary for light emission of the output end of the laser diode is the boundary for dividing the light-transmitting light beam area and the scattered light beam area, and the PD photosensitive element is arranged in the scattered light beam area.

4. The laser power detection device of claim 1, wherein: The emitted light beam of the light-transmitting light beam area passes through the diaphragm to form a light spot with a preset diameter at a fixed distance and a fixed point position.

5. The laser power detection device of claim 1, wherein: The PD photosensitive element is arranged in the laser transmission cylinder and is close to the rear half position of the light-transmitting lens to reduce external interference and sufficiently obtain the voltage fluctuation in the laser transmission cylinder, and the edges of the PD photosensitive element are arranged in the scattered light beam area.

6. A method of detecting laser power, characterized by, The laser power detection device is applied to any one of claims 1-5, and comprises the following steps: The PD photosensitive element arranged in the laser transmission cylinder receives the emitted light beam, obtains the voltage fluctuation, and obtains the corresponding value of the laser power according to the voltage fluctuation, wherein the emitted light beam received by the PD photosensitive element is the emitted light beam of the scattered light beam area; The preset voltage fluctuation threshold is used to detect the laser power, and when the voltage fluctuation exceeds the voltage fluctuation threshold, the laser power abnormality early warning is performed and the laser power adjustment strategy is correspondingly executed.

7. The method of claim 6, wherein: The preset voltage fluctuation threshold comprises a first voltage threshold and a second voltage threshold, and the voltage fluctuation between the first voltage threshold and the second voltage threshold is a normal voltage fluctuation; When the voltage of the PD photosensitive element exceeds the normal voltage fluctuation, the laser power abnormality early warning is output, and the power supply voltage and current of the laser output device are detected and error correction is performed by the master control chip to make the laser power output normal; The calibration value of the normal laser power output is 1.2±0.1 mw.

8. The method of claim 7, wherein: The pre-set voltage fluctuation threshold further comprises a third voltage threshold higher than the first voltage threshold and the second voltage threshold, when the voltage of the PD photosensitive element is higher than the third voltage threshold, an abnormally high laser power warning is output, and the power supply to the laser output device is stopped through the master control chip, and the laser beam stops emitting output.

Images