CN109157756B - Double-pulse laser output control method of Q-switched laser therapy apparatus - Google Patents
Double-pulse laser output control method of Q-switched laser therapy apparatus Download PDFInfo
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- CN109157756B CN109157756B CN201711038100.3A CN201711038100A CN109157756B CN 109157756 B CN109157756 B CN 109157756B CN 201711038100 A CN201711038100 A CN 201711038100A CN 109157756 B CN109157756 B CN 109157756B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0613—Apparatus adapted for a specific treatment
- A61N5/0616—Skin treatment other than tanning
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/067—Radiation therapy using light using laser light
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Abstract
The invention relates to a double-pulse laser output control method of a Q-switched laser therapy machine, which comprises the following steps: 1) the high-voltage power supply charges the energy storage capacitor until the charging is finished; 2) when the system detects the falling edge of the xenon lamp discharge signal pulse, the switch discharge circuit is triggered to be opened, and the xenon lamp starts to discharge; 3) when the xenon lamp discharge current rises near the maximum value, the system generates a Q power supply synchronous trigger signal, and when the system detects the pulse falling edge of the first Q power supply synchronous trigger signal, the electro-optic crystal is triggered for the first time after the system delays t 4; 4) and waiting for a delay t2, detecting the pulse falling edge of the second Q power supply synchronous trigger signal by the system, and triggering the electro-optic crystal for the second time in a pumping period after a delay t 4. The invention has strong anti-interference capability and improves the reliability of the system; the laser output energy can reach 1 joule magnitude; the interval time of the double-pulse laser is adjustable.
Description
Technical Field
The invention relates to a double-pulse laser output control method of a Q-switched laser therapy machine, in particular to a method for controlling the output of Nd: a double-pulse laser output control method for YAG Q-switched laser therapy machine.
Background
In the field of medical lasers, Nd: YAG Q-switched laser therapy machines mostly output single-pulse lasers, the pulse width of the lasers is generally 5 nS-10 nS, the output energy of the lasers is generally hundreds of mJ, and the treatment effect on some serious skin diseases is limited; if the laser energy is increased to 1J magnitude on the premise of not changing the laser pulse width, the most effective treatment can be carried out on some serious diseases, and the treatment effect is improved.
In the field of dynamic holographic detection, in order to achieve continuous observation of the rapid event development process, a double-pulse laser output laser is required as an active imaging light source. The imaging technology generally requires a double-pulse laser interval of 1 uS-1000 uS, and any transient disturbance of a measured object can be displayed on interference fringes of the double-pulse laser hologram by superposing two holograms shot by two pulse illuminations with microsecond intervals on the same holographic base plate, so that dynamic information of the measured object is obtained.
Disclosure of Invention
1. The invention aims to provide a double-pulse laser output control method of a Q-switched laser therapy machine, which has strong anti-interference capability and improves the reliability of a system; the laser output energy can reach 1 joule magnitude; the interval time of the double-pulse laser is adjustable.
In order to achieve the purpose, the invention has the following technical scheme:
the invention relates to a double-pulse laser output control method of a Q-switched laser therapy machine, which comprises the following steps:
1) the high-voltage power supply charges the energy storage capacitor until the charging is finished;
2) when the system detects the falling edge of the xenon lamp discharge signal pulse, the switch discharge circuit is triggered to be opened, and the xenon lamp starts to discharge;
3) when the xenon lamp discharge current rises near the maximum value, the system generates a Q power supply synchronous trigger signal, and when the system detects the pulse falling edge of the first Q power supply synchronous trigger signal, the electro-optic crystal is triggered for the first time after the system delays t 4;
4) waiting for a delay t2, detecting the pulse falling edge of a second Q power supply synchronous trigger signal by the system, and triggering the electro-optic crystal for the second time in a pumping period after delaying t 4;
to avoid the occurrence of other pulses or sub-pulses, t2 sets the nominal parameter that cannot be less than the Q supply; the time t5 is set not less than the time t7 and not more than the sum of the time t7 and the time t 8.
The t2 is a time interval for generating two Q power supply synchronous trigger signals in one pumping period, and the laser output energy is larger when the t2 is closer to the nominal door closing recovery time of the Q power supply; t4 is the delay time between the falling edge of the first Q power supply synchronous trigger signal pulse and the first trigger point.
The set time t5 is the interval time between the xenon lamp discharge signal falling edge and the first trigger point; the time t7 is the time required for the xenon lamp to rise from 0 to the maximum on the discharge current; time t8 is the xenon lamp discharge maximum current duration.
Due to the adoption of the technical scheme, the invention has the advantages that:
1 xenon lamp discharge signal control circuit, Q power synchronization trigger signal control circuit have all designed opto-coupler isolation circuit, and the interference killing feature is strong, has improved system reliability.
2 the laser output energy of the invention can reach 1 joule magnitude.
3 the interval time of the double-pulse laser is adjustable.
Drawings
Fig. 1 is a block schematic diagram of the working principle of the present invention.
FIG. 2 is a diagram of various pulse signals according to the present invention.
Wherein:
t 1: the low level duration of the Q power supply synchronous trigger signal;
t 2: generating a time interval of two Q power supply synchronous trigger signals in a pumping period;
t 3: xenon lamp discharge signal low level duration;
t 4: the delay time of the falling edge of the first Q power supply synchronous trigger signal and a first trigger point;
t 5: the time interval between the xenon lamp discharge signal falling edge and the first trigger point is set;
t 6: the interval between the first trigger point and the second trigger point;
t 7: the time required for the xenon lamp to rise from 0 to the maximum on the discharge current;
t 8: xenon lamp discharge maximum current duration;
Detailed Description
Referring to fig. 1 and 2, the double-pulse laser output control method of the Q-switched laser therapy machine of the invention comprises the following steps:
1) the high-voltage power supply charges the energy storage capacitor until the charging is finished;
2) when the system detects the falling edge of the xenon lamp discharge signal pulse, the switch discharge circuit is triggered to be opened, and the xenon lamp starts to discharge;
3) when the xenon lamp discharge current rises near the maximum value, the system generates a Q power supply synchronous trigger signal, and when the system detects the pulse falling edge of the first Q power supply synchronous trigger signal, the electro-optic crystal is triggered for the first time after the system delays t 4;
4) waiting for a delay t2, detecting the pulse falling edge of a second Q power supply synchronous trigger signal by the system, and triggering the electro-optic crystal for the second time in a pumping period after delaying t 4;
to avoid the occurrence of other pulses or sub-pulses, t2 sets the nominal parameter that cannot be less than the Q supply; the time t5 is set not less than the time t7 and not more than the sum of the time t7 and the time t 8.
The t2 is a time interval for generating two Q power supply synchronous trigger signals in a pumping period, and when the t2 is closer to the nominal door closing recovery time of the Q power supply, the laser output energy is larger; t4 is the delay time between the falling edge of the first Q power supply synchronous trigger signal pulse and the first trigger point.
The set time t5 is the interval time between the xenon lamp discharge signal falling edge and the first trigger point; the time t7 is the time required for the xenon lamp to rise from 0 to the maximum on the discharge current; time t8 is the xenon lamp discharge maximum current duration.
The xenon lamp discharge signal control circuit comprises a xenon lamp discharge signal control circuit and a Q power supply synchronous trigger signal control circuit; the Q power supply is characterized by being of a voltage-withdrawing type, adjustable in repetition frequency, continuously adjustable in crystal voltage, continuously adjustable in high-voltage pulse edge smaller than 10.0nS, continuously adjustable in time delay between a trigger signal and Q-switching output and high in door-closing recovery speed. The xenon lamp discharge signal and the Q power supply synchronous trigger signal are generated by a system control circuit, the xenon lamp discharge signal controls the discharge of the xenon lamp, and the Q power supply synchronous trigger signal controls the high-voltage output of the Q power supply. The utility model discloses can realize starting the electro-optic crystal twice in a pumping cycle.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications which are obvious to the technical scheme of the invention are covered by the protection scope of the invention.
Claims (1)
1. An Nd: the double-pulse laser output control method of YAG Q-switched laser therapeutic machine is characterized by that it includes the following steps:
1) the high-voltage power supply charges the energy storage capacitor until the charging is finished;
2) when the system detects the falling edge of the xenon lamp discharge signal pulse, the switch discharge circuit is triggered to be opened, and the xenon lamp starts to discharge;
3) when the xenon lamp discharge current rises near the maximum value, the system generates a Q power supply synchronous trigger signal, and when the system detects the pulse falling edge of the first Q power supply synchronous trigger signal, the electro-optic crystal is triggered for the first time after the system delays t 4;
4) waiting for a delay t2, detecting the pulse falling edge of a second Q power supply synchronous trigger signal by the system, and triggering the electro-optic crystal for the second time in a pumping period after delaying t 4;
to avoid the occurrence of other pulses, t2 sets the nominal parameter that cannot be less than the Q supply; setting the time t5 to be not less than the time t7 and not more than the sum of the time t7 and the time t 8;
the t2 is a time interval for generating two Q power supply synchronous trigger signals in a pumping period, and when the t2 is closer to the nominal door closing recovery time of the Q power supply, the laser output energy is larger; t4 is the delay time between the falling edge of the first Q power supply synchronous trigger signal pulse and the first trigger point; the set time t5 is the interval time between the xenon lamp discharge signal falling edge and the first trigger point; the time t7 is the time required for the xenon lamp to rise from 0 to the maximum on the discharge current; time t8 is the xenon lamp discharge maximum current duration.
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| CN201711038100.3A CN109157756B (en) | 2017-10-30 | 2017-10-30 | Double-pulse laser output control method of Q-switched laser therapy apparatus |
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| CN201711038100.3A CN109157756B (en) | 2017-10-30 | 2017-10-30 | Double-pulse laser output control method of Q-switched laser therapy apparatus |
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| CN109157756B true CN109157756B (en) | 2020-12-08 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354904A (en) * | 2011-01-28 | 2012-02-15 | 中国科学院福建物质结构研究所 | Double-pulse lamp pump solid laser |
| CN103036145A (en) * | 2011-09-30 | 2013-04-10 | 上海华魏光纤传感技术有限公司 | Multi-narrow-pulse laser light source and achieving method thereof |
| CN104849244A (en) * | 2015-05-28 | 2015-08-19 | 中国科学技术大学 | Multi-pulse laser-induced breakdown spectroscopy measuring method and system |
| DE102016212928B3 (en) * | 2016-07-14 | 2017-09-07 | Trumpf Laser Gmbh | Method for generating a laser pulse and arrangement for generating a driver drive signal |
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- 2017-10-30 CN CN201711038100.3A patent/CN109157756B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354904A (en) * | 2011-01-28 | 2012-02-15 | 中国科学院福建物质结构研究所 | Double-pulse lamp pump solid laser |
| CN103036145A (en) * | 2011-09-30 | 2013-04-10 | 上海华魏光纤传感技术有限公司 | Multi-narrow-pulse laser light source and achieving method thereof |
| CN104849244A (en) * | 2015-05-28 | 2015-08-19 | 中国科学技术大学 | Multi-pulse laser-induced breakdown spectroscopy measuring method and system |
| DE102016212928B3 (en) * | 2016-07-14 | 2017-09-07 | Trumpf Laser Gmbh | Method for generating a laser pulse and arrangement for generating a driver drive signal |
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