Laser performance system with laser safety protection device

Abstract

The invention discloses a laser performance system with a laser safety protection device, and relates to the field of laser safety protection. The method is applied to a laser performance system, wherein a laser performance control software system is used for determining an original given position of a galvanometer according to a designed artistic effect and generating a position control signal; the laser light source is used for providing a performance laser beam, and the laser beam projects a laser pattern in a projection area after being reflected by high-speed swinging of the galvanometer; the scanning galvanometer system controls the swing angle of a galvanometer reflecting mirror surface according to the position control signal, so that angle-controllable reflection of a laser beam is realized, and one laser beam is scanned into a laser pattern combined by different points, lines and surfaces; the laser safety protection device can monitor the working condition of the scanning galvanometer system in real time, laser output can be cut off immediately when it is found that the position of the galvanometer is abnormal, it is ensured that laser beams cannot damage surrounding personnel and objects, and the safety of the surrounding objects and personnel can be effectively protected when the laser performance system works.

Description

Technical Field

[0001] The invention relates to the technical field of laser safety protection, in particular to a laser performance system with a laser safety protection device. Background Art

[0002] In the past, due to the relatively low power of lasers (such as laser lights), damage to surrounding objects and people caused by laser lights was rare. In recent years, as the scope and field of laser light use continues to expand, the use of high-power laser lights has become more common. As the power of laser lights continues to increase, the energy density of laser beams is also rapidly increasing, and the harmfulness of lasers is also gradually increasing. However, existing laser lights often do not have safety protection devices or the safety protection devices are not set up scientifically or reasonably, so the safety issues of laser lights have caused widespread concern and attention.

[0003] In the arrangement of laser show programs, it is usually ensured that the laser beam is scanned into a pattern of a combination of points, lines, and surfaces to avoid the situation of one or several laser beams and ensure safety. However, sometimes the effect of one or several laser beams may be needed, but the laser beam of this effect will not be projected to a point statically for a long time, but will move continuously according to the artistic requirements of the performance, thereby avoiding the damage of the laser beam. However, under abnormal circumstances, such as strong interference from the outside world or failure of the scanning system of the laser light, the following safety issues will arise: 1) If the scanning system hardware is damaged and the galvanometer cannot rotate, the laser will focus on one point for a long time, which is very likely to cause damage to people or objects around, and even cause fire; 2) If strong interference or damage to the scanning system hardware causes the laser projection range to overflow the safety control area, or causes the safety window to fail, causing damage to people or objects; 3) The scanning system in the current laser light is an open-loop system, and there is no effective feedback signal to detect the actual projection position of the laser during operation. The scanning system may fail due to setting errors or equipment problems, thereby causing laser damage. Summary of the invention

[0004] In view of the problems raised in the above background technology, the present invention provides a laser performance system with a laser safety protection device to effectively protect the safety of objects and personnel around the laser.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A laser performance system with a laser safety protection device, comprising: a laser performance control software system, a laser light source, a scanning galvanometer system and a laser safety protection device;

[0007] The laser show control software system is connected to the laser light source and the scanning galvanometer system respectively; the laser show control software system is used to determine the original given position of the galvanometer in the scanning galvanometer system according to the designed artistic effect, and generate a position control signal to send to the scanning galvanometer system;

[0008] The scanning galvanometer system is arranged on the outgoing optical path of the laser light source; the laser light source is used to provide a performance laser beam, and after the laser beam is reflected by the galvanometer at high speed, a laser pattern is projected in the projection area;

[0009] The scanning galvanometer system controls the swing angle of the galvanometer reflective mirror surface according to the position control signal output by the laser show control software system, so as to realize the reflection of the laser beam at a controllable angle; under the control of the position control signal, a laser beam is scanned into laser patterns of different point, line and surface combinations through the motion synthesis in the X direction and the Y direction, so as to achieve the desired artistic effect;

[0010] The laser safety protection device is connected to the laser show control software system, the laser light source and the scanning galvanometer system respectively; the laser safety protection device includes a signal acquisition unit, a signal analysis and comparison unit and a safety protection execution unit;

[0011] The signal acquisition unit is used to obtain the original given position of the galvanometer from the laser show control software system, and is also used to collect the real-time feedback position of the galvanometer when performing the current scanning action and send it to the signal analysis and comparison unit;

[0012] The signal analysis and comparison unit is used to compare the real-time feedback position of the galvanometer with the original given position, calculate the position deviation between the real-time feedback position and the original given position, and determine that the galvanometer is faulty when the position deviation is greater than the deviation amplitude threshold;

[0013] The safety protection execution unit is used to immediately cut off the laser output after determining that the galvanometer fails.

[0014] Optionally, the signal acquisition unit obtains the current position output signal of the galvanometer through the physical light sensing of the galvanometer, and obtains the real-time feedback position of the galvanometer through signal sampling, filtering and shaping.

[0015] Optionally, the signal acquisition unit obtains the current position output signal of the galvanometer through the physical light sensor of the galvanometer, specifically including:

[0016] By measuring the luminous flux of infrared light passing through the shielding plate on the galvanometer shaft, a voltage signal positively correlated with the galvanometer deflection angle is output as the current position output signal of the galvanometer.

[0017] Optionally, the laser safety protection device also includes an auxiliary laser and a strip CCD; the auxiliary laser and the strip CCD are arranged on the X-axis and Y-axis of the galvanometer scanning; the incident angle of the auxiliary laser beam emitted by the auxiliary laser is different from the incident angle of the performance laser beam; the strip CCD is used to detect the auxiliary laser beam reflected by the galvanometer.

[0018] Optionally, the signal acquisition unit determines the real-time feedback position of the galvanometer performing the current scanning action through the position of the auxiliary laser beam detected by the strip CCD.

[0019] Optionally, the laser safety protection device further comprises a window plate and a CCD array located at the laser beam outlet; by adjusting the angle of the window plate and the installation position of the CCD array, the CCD array can just receive the laser pattern reflected by the galvanometer without affecting the normal operation of the laser show system.

[0020] Optionally, the signal acquisition unit determines the real-time feedback position of the galvanometer performing the current scanning action through the laser pattern detected by the CCD array.

[0021] Optionally, the deviation amplitude threshold is set to 1% to 5% of the full scale.

[0022] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0023] The laser performance system with a laser safety protection device provided by the present invention comprises a laser performance control software system, a laser light source, a scanning galvanometer system and a laser safety protection device; wherein the laser performance control software system is used to determine the original given position of the galvanometer according to the designed artistic effect and generate a position control signal; the laser light source is used to provide a performance laser beam, and the laser beam is reflected by the galvanometer at a high speed, and then a laser pattern is projected in a projection area; the scanning galvanometer system controls the swing angle of the galvanometer reflection mirror surface according to the position control signal, realizes the reflection of the laser beam at a controllable angle, and scans a laser beam into a laser pattern of different point, line and surface combinations; the laser safety protection device can monitor the working condition of the scanning galvanometer system in real time, and can immediately cut off the laser output when it is found that the galvanometer position is abnormal, thereby effectively protecting the safety of surrounding objects and personnel when the laser performance system is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1The overall structure diagram of the laser performance system with a laser safety protection device of the present invention;

[0026] Figure 2 This is a schematic diagram of the laser scanning projection area and safety window;

[0027] Figure 3 This is a schematic diagram of the installation positions of the auxiliary laser and the strip CCD in the second signal acquisition mode of the laser safety protection device of the present invention;

[0028] Figure 4 This is a schematic diagram of the positions of the light outlet window and the CCD array in the third signal acquisition mode of the laser safety protection device of the present invention;

[0029] Figure 5 Schematic diagram of the closed-loop control process of the laser safety protection device of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the 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.

[0031] When using high-power lasers (such as laser lights), it is common for high-power laser beams to be projected outside the safe area due to a failure in the laser scanning system, causing damage to surrounding objects or personnel. Existing technologies and devices cannot completely avoid this situation. The purpose of the present invention is to provide a laser performance system with a laser safety protection device, which can monitor the working status of the scanning galvanometer system in real time, and immediately cut off the laser output when an abnormality is found in the scanning galvanometer system, ensuring that the laser beam will not cause damage to the surrounding environment and the audience, and can effectively protect the safety of objects and personnel around the laser.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1As shown, the present invention provides a laser performance system with a laser safety protection device, including: a laser performance control software system, a laser light source (usually a laser), a scanning galvanometer system and a laser safety protection device. The technical concept of the present invention is to design a closed-loop control system for the scanning position of the galvanometer, collect the current scanning action information of the galvanometer in real time as feedback position information, and compare it with the scanning position information of the original control galvanometer. When it is found that the two are obviously different, it can be determined that the galvanometer has a fault, and the laser output is immediately cut off by cutting off the laser power supply, etc., to protect the safety of objects and personnel around the laser.

[0034] See Figure 1 , the laser show control software system is connected to the laser light source and the scanning galvanometer system respectively. The laser show control software system is used to determine the original given position of the galvanometer in the scanning galvanometer system according to the designed artistic effect, and generate a position control signal to send to the scanning galvanometer system to control the operation of the galvanometer in the scanning galvanometer system. The original given position is not only a position control signal for controlling the laser scanning galvanometer system, but also can be used as an original given position signal of the laser safety protection closed-loop control system, and used as an original comparison source (given data).

[0035] The scanning galvanometer system is arranged on the outgoing light path of the laser light source. The laser light source is used to provide a performance laser beam, and after the laser beam is reflected by the galvanometer at a high speed, a laser pattern is projected in the projection area.

[0036] Figure 2 This is a schematic diagram of the laser scanning projection area and safety window. Figure 2 The combination of points, lines and surfaces scanned by the laser 200 is synthesized by the X-axis and Y-axis motion of the scanning galvanometer system, thus forming a rectangular projection area range in the X and Y directions. In the laser projection area 201, the power density of the laser radiation is within the safe and controllable threshold, and safety is guaranteed, but personnel or objects susceptible to laser damage are still strictly prohibited from entering. If there are laser-sensitive objects (such as projectors) in the laser projection area 201 that require special protection, the safety window function of the laser show control software system can also be used to open a safety window 202 so that the laser cannot be scanned into the safety window 202 to ensure the safety of the laser. Since the laser has a high degree of directionality, the laser cannot reach outside the laser beam projection area, so it is safe for the surrounding personnel and objects. In order to ensure that everything is foolproof, a safety buffer area 203 can also be defined outside the laser projection area to prohibit personnel or objects susceptible to laser damage from entering.

[0037] The scanning galvanometer system controls the swing angle of the galvanometer reflector according to the position control signal output by the laser show control software system to achieve the controllable angle reflection of the laser beam. Under the control of the position control signal, through the motion synthesis of the X direction and the Y direction, a laser beam is scanned into laser patterns of different points, lines and surfaces to achieve the desired artistic effect.

[0038] The laser safety protection device is connected to the laser performance control software system, the laser light source and the scanning galvanometer system respectively. The laser safety protection device includes a signal acquisition unit, a signal analysis and comparison unit and a safety protection execution unit.

[0039] The signal acquisition unit is used to obtain the original given position of the galvanometer from the laser show control software system, and is also used to collect the real-time feedback position of the galvanometer when performing the current scanning action and send it to the signal analysis and comparison unit.

[0040] The signal sources collected by the signal acquisition unit are divided into two categories. One is the original given position signal as the original given data, which comes from the scanning information sent by the laser show control software system; the second is the real-time feedback position signal of the actual execution, and there are many ways to collect it: ① Obtain the real-time feedback position detection signal of the galvanometer from the scanning galvanometer system itself. This signal source is simple and convenient to obtain; ② Add an auxiliary laser source, after the galvanometer scans, it is detected and processed by CCD; ③ Use the laser beam reflected from the laser light outlet, and obtain it after detection and processing by CCD. Of course, there are other ways to obtain the real-time feedback position signal of the galvanometer after execution. The following only describes the above three methods.

[0041] ① The signal acquisition unit obtains the current position output signal of the galvanometer through the physical light sensing of the galvanometer, and obtains the real-time feedback position of the galvanometer through signal sampling, filtering, and shaping. The current position output signal of the scanning galvanometer is a signal that feeds back the position of the galvanometer itself. The principle is to measure the luminous flux of infrared light passing through the shielding piece on the rotating shaft of the galvanometer, and output a voltage signal that is positively correlated with the deflection angle. In the present invention, this signal is collected and used, and the clutter and interference signals are eliminated through the filtering and shaping circuits at the back end to obtain a suitable input signal for the protection device. The shaping part can perform operations such as amplitude modulation and proportional amplification on the filtered position feedback signal to make the output signal as close as possible to the real-time feedback position signal of the actual output.

[0042] ② If Figure 3As shown, in the second signal acquisition method, a position detection auxiliary laser and a strip CCD301 are added to the X-axis and Y-axis of the scanning galvanometer 300 respectively. The incident angle of the auxiliary laser beam 302 emitted by the auxiliary laser is different from the incident angle of the performance laser beam 303. By designing the relative positions of the auxiliary laser, the galvanometer 300 and the CCD301, the CCD301 can just detect the auxiliary laser 302 without affecting the normal performance of the galvanometer. The signal acquisition unit determines the real-time feedback position of the galvanometer 300 performing the current scanning action through the position of the auxiliary laser beam 302 detected by the strip CCD301. The signal analysis and comparison unit processes the acquired real-time feedback position information and compares it with the original given position information to achieve safety protection.

[0043] ③ Such as Figure 4 As shown, in the third signal acquisition method, the laser safety protection device also includes a window piece 401 and a CCD array 402 located at the light outlet of the performance laser beam 403. By using the reflected light of the light outlet window piece 401, the CCD array 402 is added for position detection. By adjusting the angle of the light outlet window piece 401 and the installation position of the CCD array 402, the CCD array can just receive the laser pattern reflected by the galvanometer 400 without affecting the normal operation of the laser performance system. After being processed by the signal acquisition unit, the working status of the scanning galvanometer system is obtained in real time and compared with the original given position information to achieve safety protection. The signal acquisition unit can determine the real-time feedback position of the galvanometer 400 performing the current scanning action through the laser pattern detected by the CCD array 402.

[0044] Furthermore, the signal analysis and comparison unit is used to compare the real-time feedback position of the galvanometer with the original given position, calculate the position deviation between the real-time feedback position and the original given position, and determine that the galvanometer is faulty when the position deviation is greater than the deviation amplitude threshold.

[0045] The position deviation amplitude threshold between the real-time feedback position and the original given position can be determined according to the actual situation on site, and can generally be set to 1% to 5% of the full scale. If the requirements are relatively high or the power is relatively high, the deviation amplitude can be set lower; if the laser power is relatively low or the requirements are not very high, the deviation amplitude can be set higher.

[0046] The safety protection execution unit is used to immediately cut off the laser output after determining that the galvanometer fails. The safety protection execution unit can turn off the laser light source when the actual output of the galvanometer does not match the set value, thereby reducing the risk of accidents.

[0047] The laser safety protection device of the present invention compares the obtained real-time feedback position signal with the original given position signal, and forms a control signal for the laser light source after processing. When the comparison process determines that it is abnormal, a control signal for the laser light source can be issued to cut off the laser light source in time, so that the entire laser performance system becomes a closed-loop control system, forming a complete and reliable safety protection system, thereby realizing effective protection of people and objects outside.

[0048] Similarly, when designing laser art effects, in order to avoid excessive laser power density, the minimum laser projection angle or single-point projection can be limited to limit the laser power density. When the laser scanning galvanometer system fails, resulting in a very small laser projection angle or single-point projection, the laser safety protection device will compare the acquired data with the original data, and issue a command in time to cut off the laser output when the data is abnormal to ensure laser safety.

[0049] The laser safety protection device of the present invention can realize the real-time feedback position information collection and monitoring of the laser scanning galvanometer system, and utilize the existing galvanometer position signal or the real-time position feedback signal obtained by other technical means to perform real-time monitoring and closed-loop control of the laser scanning galvanometer system. Furthermore, the laser safety protection device of the present invention can also realize the comparison and judgment of the laser scanning position feedback information; the position information sent by the laser show control software is used as the original given position information, and the real-time collected laser scanning galvanometer position information is used as the real-time feedback position information, and the real-time feedback position information is compared and judged with the original given position information. When the comparison judges that the real-time feedback position information of the laser scanning galvanometer system is slightly different from the original given position information, it can be determined that the laser scanning galvanometer system has a fault, and the laser output is shut down in real time to achieve closed-loop control and ensure the safe use of the laser. The laser safety protection device of the present invention can also flexibly set the comparison threshold (deviation amplitude threshold) according to the performance scene, and execute it when the laser show system is working. Figure 5 The control process shown can effectively avoid laser damage and meet performance requirements.

[0050] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A laser performance system with a laser safety protection device, characterized in that: include: Laser show control software system, laser light source, scanning galvanometer system and laser safety protection device; The laser show control software system is connected to the laser light source and the scanning galvanometer system respectively; the laser show control software system is used to determine the original given position of the galvanometer in the scanning galvanometer system according to the designed artistic effect, and generate a position control signal to send to the scanning galvanometer system; The scanning galvanometer system is arranged on the outgoing optical path of the laser light source; the laser light source is used to provide a performance laser beam, and after the laser beam is reflected by the galvanometer at high speed, a laser pattern is projected in the projection area; The scanning galvanometer system controls the swing angle of the galvanometer reflective mirror surface according to the position control signal output by the laser show control software system, so as to realize the reflection of the laser beam at a controllable angle; under the control of the position control signal, a laser beam is scanned into laser patterns of different point, line and surface combinations through the motion synthesis in the X direction and the Y direction, so as to achieve the desired artistic effect; The laser safety protection device is connected to the laser show control software system, the laser light source and the scanning galvanometer system respectively; the laser safety protection device includes a signal acquisition unit, a signal analysis and comparison unit and a safety protection execution unit; The signal acquisition unit is used to obtain the original given position of the galvanometer from the laser show control software system, and is also used to collect the real-time feedback position of the galvanometer when performing the current scanning action and send it to the signal analysis and comparison unit; The signal analysis and comparison unit is used to compare the real-time feedback position of the galvanometer with the original given position, calculate the position deviation between the real-time feedback position and the original given position, and determine that the galvanometer is faulty when the position deviation is greater than the deviation amplitude threshold; The safety protection execution unit is used to immediately cut off the laser output after determining that the galvanometer fails.

2. The laser performance system with laser safety protection device according to claim 1, characterized in that: The signal acquisition unit obtains the current position output signal of the galvanometer through the physical light sensing of the galvanometer, and obtains the real-time feedback position of the galvanometer through signal sampling, filtering and shaping.

3. The laser performance system with laser safety protection device according to claim 2, characterized in that: The signal acquisition unit obtains the current position output signal of the galvanometer through the physical light sensor of the galvanometer, specifically including: By measuring the luminous flux of infrared light passing through the shielding plate on the galvanometer shaft, a voltage signal positively correlated with the galvanometer deflection angle is output as the current position output signal of the galvanometer.

4. The laser performance system with laser safety protection device according to claim 1, characterized in that: The laser safety protection device also includes an auxiliary laser and a strip CCD; the auxiliary laser and the strip CCD are arranged on the X-axis and Y-axis of the galvanometer scanning; the incident angle of the auxiliary laser beam emitted by the auxiliary laser is different from the incident angle of the performance laser beam; the strip CCD is used to detect the auxiliary laser beam reflected by the galvanometer.

5. The laser performance system with laser safety protection device according to claim 4, characterized in that: The signal acquisition unit determines the real-time feedback position of the galvanometer performing the current scanning action through the position of the auxiliary laser beam detected by the strip CCD.

6. The laser performance system with laser safety protection device according to claim 1, characterized in that: The laser safety protection device also includes a window plate and a CCD array located at the laser beam outlet. By adjusting the angle of the window plate and the installation position of the CCD array, the CCD array can just receive the laser pattern reflected by the galvanometer without affecting the normal operation of the laser performance system.

7. The laser performance system with laser safety protection device according to claim 6, characterized in that: The signal acquisition unit determines the real-time feedback position of the galvanometer when performing the current scanning action through the laser pattern detected by the CCD array.

8. The laser performance system with laser safety protection device according to claim 1, characterized in that: The deviation amplitude threshold is set to 1% to 5% of the full scale.

Images