CN112729019A - Ignition laser system with dual-wavelength detection - Google Patents
Ignition laser system with dual-wavelength detection Download PDFInfo
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- CN112729019A CN112729019A CN202011535924.3A CN202011535924A CN112729019A CN 112729019 A CN112729019 A CN 112729019A CN 202011535924 A CN202011535924 A CN 202011535924A CN 112729019 A CN112729019 A CN 112729019A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/10—Initiators therefor
- F42B3/113—Initiators therefor activated by optical means, e.g. laser, flashlight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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Abstract
An ignition laser system for dual-wavelength detection relates to the technical field of ignition laser systems, solves the problems of low energy efficiency and low self-checking reliability, and comprises an ignition laser, a detection laser, a first reflector, a focusing lens, a coupling optical fiber, a self-focusing lens, a detection laser reflector, an ignition laser detector and a detection laser detector; the light emitted by the ignition laser and the detection laser is incident on the first reflector to be transmitted and reflected, the reflected ignition laser is transmitted to the ignition laser detector, and the transmitted ignition laser is transmitted by the detection laser reflector after being converged by the focusing lens, the coupling optical fiber and the self-focusing lens in sequence; the transmitted detection laser sequentially passes through the focusing lens, the coupling optical fiber and the self-focusing lens, then is incident on the detection laser reflector to be reflected, returns to the first reflector in the original path and then is reflected to the detection laser detector. The invention has the advantages of simple structure, high energy utilization efficiency, high power density, safe and reliable laser measurement and realization of output of coupling optical fibers with smaller caliber.
Description
Technical Field
The invention relates to the technical field of ignition laser systems, in particular to an ignition laser system for dual-wavelength detection.
Background
In the laser ignition system, laser energy of an ignition laser is transmitted through an optical fiber and is incident on the surface of an ignition agent in a laser ignition workpiece, so that the ignition workpiece is ignited. The laser ignition system needs to have a self-checking function including continuity self-checking of the optical path and output power self-checking of the ignition laser.
As shown in fig. 1, in the existing ignition laser system, an ignition laser detector 3 is connected with an ignition laser 1 through an optical fiber, the ignition laser 1 is connected with a detection laser 2 through an optical switch 13 and an interface a of an optical fiber circulator 14, the ignition laser 1 and the detection laser 2 are output through an optical fiber of an interface B of the optical fiber circulator 14, wherein a reflective film of a detection laser band is coated on an end face of an output connector, and detection laser returns and then enters a detection laser detector 4 through an interface C of the optical fiber circulator 14.
Such an ignition laser system suffers from the following disadvantages:
(1) the ignition laser and the detection laser are respectively coupled by using optical fibers and then combined, and the switching between the two core diameter optical fibers is involved, so that the energy efficiency is reduced, and the caliber of an output optical fiber is increased;
(2) when the ignition laser and the detection laser are used for detection, additional devices such as an additional optical switch 13, an optical fiber circulator 14 and the like are needed, so that the energy loss, the budget cost and the system volume are increased;
(3) when the ignition laser outputs to irradiate the surface of the initiating explosive device, the laser power density is reduced due to the irradiation distance and the laser emergent divergence characteristic;
(4) the ignition laser and the detection laser use fluorescence detection, so that the reliability of self-detection is reduced.
Disclosure of Invention
To solve the above problems, the present invention provides an ignition laser system for dual wavelength detection.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the ignition laser system for dual-wavelength detection comprises an ignition laser, a detection laser, a first lens, a focusing lens, a coupling optical fiber, a self-focusing lens, a detection laser reflector, an ignition laser detector and a detection laser detector;
ignition laser emitted by the ignition laser device is incident on the first reflector to be transmitted and reflected, the reflected ignition laser is transmitted to the ignition laser detector, and the transmitted ignition laser is converged by the focusing lens, transmitted by the coupling optical fiber, converged by the self-focusing lens and transmitted by the detection laser reflector in sequence;
the detection laser emitted by the detection laser device is incident on the first reflector to be transmitted and reflected, the transmitted detection laser is sequentially converged by the focusing lens, transmitted by the coupling optical fiber, converged by the self-focusing lens and then incident on the detection laser reflector, and the transmitted detection laser is reflected by the detection laser reflector, returns to the first reflector, and is reflected to the detection laser detector by the first reflector.
The invention has the beneficial effects that:
1. the ignition laser system for dual-wavelength detection uses a space beam combination technology, directly enters the coupling optical fiber after the ignition laser and the detection laser are coupled in space, does not need to carry out additional optical fiber coupling, and can realize the output of the coupling optical fiber with smaller caliber.
2. The combined action of the first reflector and the self-focusing lens is used for detecting and measuring the energy of the ignition laser and the detection laser, the detection and the measurement are realized through a simple light path structure, devices such as an optical switch, an optical fiber circulator and the like are not needed, the structure is simplified, the energy utilization efficiency is improved, the energy loss is reduced, the budget cost is reduced, and the volume of the system is reduced.
3. The power density of the output laser light is increased by the self-focusing lens.
4. Compared with fluorescence detection, the detection laser and the ignition laser measurement have higher safety and reliability.
Drawings
Fig. 1 is a schematic structural diagram of a conventional laser ignition system.
Fig. 2 is a block diagram of the ignition laser system for dual wavelength detection of the present invention.
In the figure: 1. the device comprises an ignition laser 2, a detection laser 3, an ignition laser detector 4, a detection laser detector 5, a first reflector 6, a focusing lens 7, a coupling optical fiber 8, a self-focusing lens 9, a detection laser reflector 10, a first aspheric surface focusing lens 11, a second shaping fast axis lens 12, a second shaping slow axis lens 13, an optical switch 14 and an optical fiber circulator.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description. The present invention may be embodied in other specific forms than those herein described and it is therefore not intended that the scope of the invention be limited to the specific embodiments disclosed below.
The ignition laser system for dual-wavelength detection, as shown in fig. 2, includes an ignition laser 1, a detection laser 2, a first reflector 5, a focusing lens 6, a coupling fiber 7, a self-focusing lens 8, a detection laser reflector 9, an ignition laser detector 3 and a detection laser detector 4. Ignition laser emitted by the ignition laser 1 is incident on the first reflector 5 to be transmitted and reflected, the reflected ignition laser is transmitted to the ignition laser detector 3, the ignition laser detector 3 detects the ignition laser, and the ignition laser detector 3 is used for detecting and measuring the energy of the ignition laser; the transmitted ignition laser is converged and coupled by the focusing lens 6, enters the coupling optical fiber 7, is transmitted to the self-focusing lens 8 through the coupling optical fiber 7, is converged by the self-focusing lens 8, is incident on the detection laser reflector 9, and is transmitted and emitted out of the ignition laser system through the detection laser reflector 9. The detection laser emitted by the detection laser 2 is incident on the first reflector 5 to be transmitted and reflected, the transmitted detection laser is converged and coupled by the focusing lens 6 in sequence and then enters the coupling optical fiber 7, is transmitted to the self-focusing lens 8 through the coupling optical fiber 7, is incident on the detection laser reflector 9 after being converged by the self-focusing lens 8, is transmitted to the self-focusing lens 8 after being reflected by the detection laser reflector 9, is incident on the coupling optical fiber 7 after being converged by the self-focusing lens 8, is transmitted to the focusing lens 6 through the coupling optical fiber 7, is transmitted to the first reflector 5 after being converged by the focusing lens 6, is reflected to the detection laser detector 4 through the first reflector 5, the detection laser detector 4 detects the detection laser, and the detection laser detector 4 is used for detecting and measuring the energy of the detection laser.
The first reflector 5, the focusing lens 6, the coupling fiber 7, the self-focusing lens 8 and the detection laser reflector 9 are sequentially arranged, as shown in fig. 2, the ignition laser 1, the detection laser 2 and the ignition laser detector 3 are all positioned on one side of the first surface of the first reflector 5, and the detection laser detector 4 and the focusing lens 6 are all positioned on one side of the second surface of the first reflector 5.
The front surface of the first reflector 5 is called a first surface, the reverse surface is called a second surface, and the first reflector 5 is a planar lens. The first surface of the first reflector 5 is plated with an ignition laser high-transmittance low-reflectance film, specifically, ignition laser 99% transmission 1% reflection. The second surface of the first reflector 5 is plated with a semi-reflecting and semi-transparent film of the detection laser 2, and the detection laser is transmitted by 50% and reflected by 50%. The detection laser reflector 9 is coated with an ignition laser high-transmittance film. Ignition laser 1, detection laser 2, first speculum 5, focusing lens 6, coupling fiber 7, self-focusing lens 8, ignition laser detector 3 and detection laser detector 4 are located a casing, and detection laser speculum 9 can be located in the casing also can be located the casing outside.
The ignition laser emitted by the ignition laser 1 and the detection laser emitted by the detection laser 2 can be incident on the first reflector 5 after passing through the beam combiner/beam combiner combination beam. The detection laser 2, the ignition laser 1, the first reflector 5, the focusing lens 6, the coupling optical fiber 7, the self-focusing lens 8 and the detection laser reflector 9 are sequentially arranged, or the ignition laser 1, the detection laser 2, the first reflector 5, the focusing lens 6, the coupling optical fiber 7, the self-focusing lens 8 and the detection laser reflector 9 are sequentially arranged. Ignition laser emitted by the ignition laser 1 can be incident on the first reflecting mirror 5 through one side outside the detection laser 2, or detection laser emitted by the detection laser 2 can be incident on the first reflecting mirror 5 through one side outside the ignition laser 1, preferably, a beam combining mirror/beam combining mirror group is not arranged, the distance between the ignition laser emitted by the ignition laser 1 and the detection laser emitted by the detection laser 2 is less than 2mm, specifically, the height difference between the ignition laser emitted by the ignition laser 1 and the detection laser emitted by the detection laser 2 is less than 2mm, and light spot beam combining is realized through the dislocation arrangement (height dislocation in the embodiment) of the ignition laser 1 and the detection laser 2.
The ignition laser system of the present invention further comprises a first shaping lens and a second shaping lens. The first shaping lens is arranged corresponding to the detection laser 2 and is used for shaping the detection laser emitted by the collimation detection laser 2. The detection laser emitted by the detection laser 2 is collimated by the first shaping lens and then enters the first surface of the first reflector 5. The second shaping lens is arranged corresponding to the ignition laser 1 and is used for shaping the ignition laser emitted by the collimation ignition laser 1. The ignition laser emitted by the ignition laser 1 is collimated by the second shaping lens and then enters the first surface of the first reflector 5. The first shaping lens can adopt a first shaping fast axis mirror and a first shaping slow axis mirror, and the first shaping lens can also adopt a first aspheric surface focusing mirror 10 as the first shaping lens. The second shaping lens can adopt a second shaping fast axis mirror 11 and a second shaping slow axis mirror 12, and the second shaping lens can also adopt a second aspheric surface focusing mirror as a second shaping lens.
In the embodiment, the ignition laser 1 and the detection laser 2 are both semiconductor lasers, the ignition laser has a wavelength of 976nm and a power of 5-30W, the detection laser has a wavelength of 1310nm and a power of less than 10 mW. Ignition laser 1 is the echelonment with detection laser 2 and arranges, detect laser 2, ignition laser 1 and first speculum 5 set up in order, it is higher than ignition laser 1 to detect laser 2, the detection laser that detects 2 outgoing of laser can be through on 1 upside transmission of ignition laser 5, the detection laser that detects 2 outgoing of laser is a little higher than ignition laser 1, the difference in height of the detection laser that detects 2 outgoing of laser and the ignition laser of 1 outgoing of ignition laser is less than or equal to 1 mm. The first shaping lens adopts a first aspheric surface focusing lens 10 as a first shaping lens, the second shaping lens adopts a second shaping fast axis lens 11 and a second shaping slow axis lens 12, and the detection laser 2, the first aspheric surface focusing lens 10, the ignition laser 1, the second shaping fast axis lens 11, the second shaping slow axis lens 12 and the first reflector 5 are sequentially arranged. The detection laser emitted by the detection laser 2 is transmitted to the first surface of the first reflector 5 after passing through the first aspheric focusing mirror 10, and the ignition laser emitted by the ignition laser 1 is transmitted to the first surface of the first reflector 5 after being shaped by the second shaping fast axis mirror 11 and the second shaping slow axis mirror 12. The coupling fiber 7 is an optical fiber having a core diameter of 105 um. The length of the self-focusing lens 8 is 0.21-0.29P, the distance between the self-focusing lens 8 and the coupling optical fiber 7 is 0-3mm, and the distance between the detection laser reflector 9 and the self-focusing lens 8 is 0-3 mm.
When the detection laser 2 is turned off, the ignition laser is shaped into parallel beams through the second shaping fast axis mirror 11 and the second shaping slow axis mirror 12, when the parallel beams are incident on the first surface of the first reflecting mirror 5, 1% of 976nm laser energy is reflected into the 976nm ignition laser detector 3, 99% of the laser energy is incident into the focusing lens 6 and is coupled into the 105um core diameter coupling optical fiber 7 through space adjustment, the ignition laser is emitted from the coupling optical fiber 7 and then passes through the self-focusing lens 8, and finally the ignition laser is incident on an initiating explosive device through the 976nm high-transmission detection laser reflecting mirror 9 for ignition.
When the ignition laser 1 is turned off, the detection laser passes through the first aspheric focusing mirror 10 and then parallelly enters the first reflecting mirror 5, 50% of laser energy passes through the second surface and then enters the focusing lens 6, the detection laser is coupled to the 105um core diameter coupling optical fiber 7 and then exits into the self-focusing lens 8, after the detection laser is incident to the detection laser reflecting mirror 9, the light path returns to the first reflecting mirror 5 in an original way and is reflected on the second surface, and 50% of laser energy irradiates the 1310nm detection laser detector 4.
The ignition laser system for dual-wavelength detection of the invention uses a space beam combination technology, directly enters the coupling optical fiber 7 after the ignition laser and the detection laser are coupled in space, does not need to carry out extra optical fiber coupling, and can realize the output of the coupling optical fiber 7 with smaller caliber. The invention does not adopt a mode of respectively coupling to optical fibers and then combining the optical fibers, the ignition laser and the detection laser pass a space beam combination mode, and the switching between two core diameter optical fibers is not involved, thereby solving the problems of low energy efficiency of the ignition laser and the detection laser and large caliber of the output optical fiber.
The ignition laser system for dual-wavelength detection of the invention performs detection and measurement of ignition laser and detection laser energy through the combined action of the first reflector 5 and the self-focusing lens 8, realizes detection and measurement through a simple light path structure, does not need to adopt devices such as an optical switch 13, an optical fiber circulator 14 and the like, simplifies the structure, improves the energy utilization efficiency, reduces the energy loss, reduces the budget cost and reduces the volume of the system.
According to the invention, the self-focusing lens 8 is arranged at one end of the coupling optical fiber 7, the size and the divergence angle of an output light spot are reduced through the self-focusing lens 8, the emergent ignition laser is converged, the power density of the output laser is improved, and the light energy density is not weakened. When the light enters the surface of the initiating explosive device, the working area is small, and the energy density is high.
The invention improves the detection laser and ignition laser measurement methods, compared with fluorescence detection, the detection laser and ignition laser measurement has higher safety and reliability, mainly because the detector measures through the optical reflection principle, the detected energy is the percentage of the input energy, and the detection is more accurate and reliable.
Claims (8)
1. The ignition laser system for dual-wavelength detection comprises an ignition laser (1) and a detection laser (2), and is characterized by further comprising a first reflector (5), a focusing lens (6), a coupling optical fiber (7), a self-focusing lens (8), a detection laser reflector (9), an ignition laser detector (3) and a detection laser detector (4);
ignition laser emitted by an ignition laser device (1) is incident on a first reflector (5) to be transmitted and reflected, the reflected ignition laser is transmitted to an ignition laser detector (3), and the transmitted ignition laser is converged by a focusing lens (6), transmitted by a coupling optical fiber (7), converged by a self-focusing lens (8) and transmitted by a detection laser reflector (9) in sequence;
detection laser emitted by the detection laser (2) is incident on the first reflector (5) to be transmitted and reflected, the transmitted detection laser is sequentially converged by the focusing lens (6), transmitted by the coupling optical fiber (7), converged by the self-focusing lens (8) and then incident on the detection laser reflector (9), reflected by the detection laser reflector (9), returned to the first reflector (5) in the original path, and reflected to the detection laser detector (4) by the first reflector (5).
2. The dual wavelength detection ignition laser system according to claim 1, wherein the first reflector (5), the focusing lens (6), the coupling fiber (7), the self-focusing lens (8), and the detection laser reflector (9) are sequentially disposed, the ignition laser (1), the detection laser (2), and the ignition laser detector (3) are disposed on a first surface side of the first reflector (5), and the detection laser detector (4) is disposed on a second surface side of the first reflector (5).
3. The dual-wavelength detection ignition laser system according to claim 2, wherein a first surface of the first reflector (5) is coated with an ignition laser high-transmittance low-reflectance film, and a second surface of the first reflector (5) is coated with a detection laser (2) semi-transmittance film.
4. The dual wavelength detection ignition laser system according to claim 1, wherein the detection laser (2), the ignition laser (1), the first reflector (5), the focusing lens (6), the coupling fiber (7), the self-focusing lens (8), the detection laser reflector (9) are sequentially disposed, or the ignition laser (1), the detection laser (2), the first reflector (5), the focusing lens (6), the coupling fiber (7), the self-focusing lens (8), the detection laser reflector (9) are sequentially disposed.
5. Ignition laser system for dual wavelength detection according to claim 4, characterized in that the ignition laser from the ignition laser (1) can be incident on the first mirror (5) via the side outside the detection laser (2), or the detection laser from the detection laser (2) can be incident on the first mirror (5) via the side outside the ignition laser (1), the distance between the ignition laser from the ignition laser (1) and the detection laser from the detection laser (2) being less than 2 mm.
6. The ignition laser system for dual wavelength detection according to claim 5, characterized in that the distance between the ignition laser emitted by the ignition laser (1) and the detection laser emitted by the detection laser (2) is less than 2mm, in particular: the height difference between the ignition laser emitted by the ignition laser (1) and the detection laser emitted by the detection laser (2) is less than 2 mm.
7. The dual-wavelength-detection ignition laser system according to claim 1, wherein the ignition laser system further comprises a first shaping lens and a second shaping lens, the first shaping lens is disposed corresponding to the detection laser (2) and is used for shaping and collimating the detection laser emitted by the detection laser (2), and the detection laser emitted by the detection laser (2) is incident on the first reflector (5) after being shaped and collimated by the first shaping lens; the second shaping lens is arranged corresponding to the ignition laser (1) and is used for shaping and collimating the ignition laser emitted by the ignition laser (1), and the ignition laser emitted by the ignition laser (1) is incident to the first reflector (5) after being shaped and collimated by the second shaping lens.
8. The dual wavelength detection ignition laser system of claim 1, further comprising a beam combiner, wherein the ignition laser emitted from the ignition laser (1) and the detection laser emitted from the detection laser (2) are capable of being combined by the beam combiner and then incident on the first reflector (5).
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Cited By (2)
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| CN113357967A (en) * | 2021-05-19 | 2021-09-07 | 西安交通大学 | Millisecond long wave-nanosecond short wave double-pulse laser ignition system |
| CN113686436A (en) * | 2021-08-30 | 2021-11-23 | 航宇救生装备有限公司 | Full-optical-path full-power detection method and device for ignition laser for ejection rescue |
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