CN106644407A - Laser-induced plasma ignition time measurement device - Google Patents
Laser-induced plasma ignition time measurement device Download PDFInfo
- Publication number
- CN106644407A CN106644407A CN201611144159.6A CN201611144159A CN106644407A CN 106644407 A CN106644407 A CN 106644407A CN 201611144159 A CN201611144159 A CN 201611144159A CN 106644407 A CN106644407 A CN 106644407A
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- laser
- plasma
- burning time
- oscillograph
- time measurement
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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
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- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention discloses a laser-induced plasma ignition time measurement device, and the device comprises a circuit module, an optical path module, and an oscilloscope. The circuit module comprises a DC power supply, a resistor connected with the DC power supply, a first copper pin connected with the resistor, and a second copper pin connected with the DC power supply. Two ends of the resistor are connected with the oscilloscope. The optical path module comprises a nanosecond pulse laser, a spectroscope, a convex lens, a diffuse reflection screen, and an optical fiber probe. The nanosecond pulse laser, the spectroscope and the convex lens are arranged coaxially, and a focus of the convex lens is located at the center of a gap between the two copper pins. The diffuse reflection screen is located at a reflection side of the spectroscope, and the optical fiber probe is disposed at a reflection light side of the diffuse reflection screen, and is connected with the oscilloscope. The device is simple in structure, is convenient to operate, and is high in measurement precision.
Description
Technical field
The invention belongs to laser technology field, is related to a kind of using electrode method measurement laser induced plasma burning time
Measurement apparatus.
Background technology
Nowadays, laser ignition becomes the engine ignition mode of focus.When superlaser is focused in atmosphere, will
Induction air breakdown, forms the laser plasma of high pressure-temperature.Laser plasma outwards tells the gas for expanding against surrounding
Body forms the shock wave propagated at a high speed, and the intensity of shock wave can meet the requirement of igniter applications.But using induced with laser etc.
Ion body technique is that engine ignition needs the very important problem for solving to seek to accurately control burning time.Cause
This, needs a kind of device that can accurately measure laser induced plasma burning time.
The content of the invention
(1) goal of the invention
The purpose of the present invention is：For the requirement of above-mentioned accurate measurement laser induced plasma burning time, one is proposed
Plant high precision, the measurement apparatus of easy to operate plasma ignition time.(2) technical scheme
In order to solve above-mentioned technical problem, the present invention provides a kind of laser induced plasma burning time measurement apparatus,
It includes：Circuit module, light path module and oscillograph；Circuit module include the resistance that dc source and dc source connect and
First bronze medal pin of resistance connection and the second bronze medal pin being connected with dc source；Resistance two ends connect respectively oscillograph；Light path module
It is nanosecoud pulse laser, spectroscope, convex including nanosecoud pulse laser, spectroscope, convex lens, diffuse reflecting screen and fibre-optical probe
Lens three is coaxially arranged, and the convergence focus of convex lens is located at the gap center between two copper pins, and diffuse reflecting screen is located at divides
The reflective side of light microscopic, optical fiber probe is arranged at the reflected light line side of diffuse reflecting screen and is connected with oscillograph.
Wherein, in the circuit module, when not producing plasma between two copper pins, circuit module is open circuit, resistance
Two ends do not have voltage signal；Plasma is produced when pulse laser punctures air in the gap of two copper pins, circuit becomes and closes
Loop is closed, resistance two ends produce voltage signal and are input in oscillograph, and by the waveform of oscilloscope display plasma is obtained
The time for producing and terminating.
Wherein, in the light path module, Jing after spectroscope, a part for transmission swashs the laser of nanosecoud pulse laser outgoing
Light planoconvex lens is converged, and the air for puncturing gap location between two copper pins produces plasma, for measuring the product of plasma
The raw and end time；Fibre-optical probe imports to the optical signal for detecting in oscillograph, and obtain laser instrument goes out the light moment, leads to
Cross and calculate the time difference that laser instrument goes out light moment and plasma generation moment, that is, obtain the burning time of plasma.
Wherein, there is the interval of 4-6mm between described two copper pins.
Wherein, at intervals of 5mm between described two copper pins.
Wherein, the dc source selects 5V dc sources, DC power cathode connection resistance, positive pole to connect the second bronze medal
Pin.
Present invention also offers a kind of laser induced plasma burning time measuring method, it is comprised the following steps：
1st, light path module and circuit module are built, the position of convex lens is adjusted, makes ps pulsed laser and ns pulsed laser focus on two bronze medal pins
Between；
2nd, oscillograph is adjusted to into external trigger pattern, is triggered by fibre-optical probe signal；
3rd, control laser instrument and trigger single nanosecond pulse, preserve oscillograph image, by the curvilinear motion of two passages, meter
Calculate the burning time of plasma.
Wherein, the energy of single nanosecond pulse is set to 2J.
(3) beneficial effect
The laser induced plasma burning time measurement apparatus that above-mentioned technical proposal is provided, simple structure, operation side
Just, certainty of measurement is high.
Description of the drawings
Fig. 1 is that plasma is produced and end time measurement apparatus.
Fig. 2 is plasma ignition time measurement device.
Specific embodiment
To make the purpose of the present invention, content and advantage clearer, with reference to the accompanying drawings and examples, the tool to the present invention
Body embodiment is described in further detail.
So-called laser induced plasma burning time, is carved into the generation of laser breakdown air when exactly going out light from laser instrument
The time at plasma moment.Forefathers' experiment shows that, even if the gas of common gases only 0.1% is ionized, this gas is just
Possess good plasma properties, if 1% gas is ionized, plasma at this moment just becomes ideal conducting
Body.According to this characteristics design such as the circuit of Fig. 1, including the resistance and resistance connection of dc source and dc source connection
The first bronze medal pin and the second bronze medal pin for being connected with dc source, resistance two ends connect respectively oscillograph.
There is the interval of 4-6mm between two copper pins, preferred 5mm is spaced, when not producing plasma, circuit is open circuit, electricity
Resistance two ends do not have voltage signal.When pulse laser puncture in the gap of two copper pins air produce plasma, due to wait from
Daughter has good conductive characteristic, and now circuit becomes closed-loop path, and resistance two ends produce voltage signal and are input to oscillograph
In, the time of generation and the end of plasma can be just accurately obtained by the waveform of oscilloscope display.
Fig. 2 devices increased nanosecoud pulse laser, spectroscope, convex lens, diffuse reflecting screen and optical fiber relative to Fig. 1 devices
Probe, nanosecoud pulse laser, spectroscope, convex lens three are coaxially arranged, and the convergence focus of convex lens is located at two copper pins
Between gap center, diffuse reflecting screen is located at spectroscopical reflective side, and optical fiber probe is arranged at the reflected light line side of diffuse reflecting screen
And be connected with oscillograph.
Jing after spectroscope, a part of laser planoconvex lens of transmission is converged the laser of nanosecoud pulse laser outgoing, is punctured
The air of gap location produces plasma between two copper pins, and closing of circuit, resistance two ends produce voltage signal and are input to oscillography
In device, generation and the end time of plasma is obtained；Fibre-optical probe imports to the optical signal for detecting in oscillograph, obtains
Go out the light moment to laser instrument, the time difference at light moment and plasma generation moment is gone out by calculating laser instrument, that is, obtain
The burning time of gas ions.
In said apparatus, dc source selects 5V dc sources, DC power cathode connection resistance, positive pole to connect the second bronze medal
Pin.
Based on said apparatus, laser induced plasma burning time measuring method is comprised the following steps：
1st, light path and circuit are built, by the position for adjusting convex lens, ps pulsed laser and ns pulsed laser is focused between two bronze medal pins
The energy of single nanosecond pulse is set to 2J；
2nd, oscillograph is adjusted to into external trigger pattern, is triggered by fibre-optical probe signal；
3rd, control laser instrument and trigger single nanosecond pulse, preserve oscillograph image, by the curvilinear motion of two passages, meter
Calculate the burning time of plasma.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, on the premise of without departing from the technology of the present invention principle, some improvement and deformation can also be made, these improve and deform
Also should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of laser induced plasma burning time measurement apparatus, it is characterised in that include：Circuit module, light path module
And oscillograph；Circuit module include the first bronze medal pin of the resistance that dc source and dc source connect and resistance connection and with it is straight
Second bronze medal pin of stream power supply connection；Resistance two ends connect respectively oscillograph；Light path module includes nanosecoud pulse laser, light splitting
Mirror, convex lens, diffuse reflecting screen and fibre-optical probe, nanosecoud pulse laser, spectroscope, convex lens three are coaxially arranged, and convex lens
The convergence focus of mirror is located at the gap center between two copper pins, and diffuse reflecting screen is located at spectroscopical reflective side, and optical fiber probe sets
It is placed in the reflected light line side of diffuse reflecting screen and is connected with oscillograph.
2. laser induced plasma burning time measurement apparatus as claimed in claim 1, it is characterised in that the circuit mould
In block, when not producing plasma between two copper pins, circuit module is open circuit, and resistance two ends do not have voltage signal；Work as pulse
Laser punctures air in the gap of two copper pins and produces plasma, and circuit becomes closed-loop path, and resistance two ends produce voltage
Signal input obtains the time of generation and the end of plasma by the waveform of oscilloscope display in oscillograph.
3. laser induced plasma burning time measurement apparatus as claimed in claim 2, it is characterised in that the light path mould
In block, Jing after spectroscope, a part of laser planoconvex lens of transmission is converged the laser of nanosecoud pulse laser outgoing, punctures two
The air of gap location produces plasma between copper pin, for measuring generation and the end time of plasma；Fibre-optical probe
The optical signal for detecting is imported in oscillograph, obtain laser instrument goes out the light moment, by calculate laser instrument go out the light moment with
Plasma produces the time difference at moment, that is, obtain the burning time of plasma.
4. laser induced plasma burning time measurement apparatus as claimed in claim 3, it is characterised in that described two copper
There is the interval of 4-6mm between pin.
5. laser induced plasma burning time measurement apparatus as claimed in claim 4, it is characterised in that described two copper
At intervals of 5mm between pin.
6. laser induced plasma burning time measurement apparatus as claimed in claim 3, it is characterised in that the direct current
Source selects 5V dc sources, DC power cathode connection resistance, positive pole to connect the second bronze medal pin.
7. a kind of laser induced plasma burning time measuring method, it is characterised in that comprise the following steps：
1), build light path module and circuit module, adjust the position of convex lens, make ps pulsed laser and ns pulsed laser focus on two bronze medal pins it
Between；
2), oscillograph is adjusted to into external trigger pattern, is triggered by fibre-optical probe signal；
3), control laser instrument and trigger single nanosecond pulse, preserve oscillograph image, by the curvilinear motion of two passages, calculate
The burning time of plasma.
8. laser induced plasma burning time measuring method as claimed in claim 7, it is characterised in that single nanosecond arteries and veins
The energy of punching is set to 2J.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611144159.6A CN106644407B (en) | 2016-12-13 | 2016-12-13 | Laser-induced plasma ignition time measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611144159.6A CN106644407B (en) | 2016-12-13 | 2016-12-13 | Laser-induced plasma ignition time measuring device |
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| Publication Number | Publication Date |
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| CN106644407A true CN106644407A (en) | 2017-05-10 |
| CN106644407B CN106644407B (en) | 2020-02-04 |
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| CN201611144159.6A Active CN106644407B (en) | 2016-12-13 | 2016-12-13 | Laser-induced plasma ignition time measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109352181A (en) * | 2018-09-28 | 2019-02-19 | 中国工程物理研究院化工材料研究所 | Laser ablation metal material action time test device and method |
| CN112099146A (en) * | 2020-09-21 | 2020-12-18 | 中国科学院长春光学精密机械与物理研究所 | Optical fiber collimation coupling system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009097427A (en) * | 2007-10-17 | 2009-05-07 | Toyota Central R&D Labs Inc | Laser-induced spark discharge ignitor |
| CN101650441A (en) * | 2008-12-15 | 2010-02-17 | 茂名学院 | Method for detecting electron emission of plasma |
| CN101696936A (en) * | 2009-10-22 | 2010-04-21 | 浙江师范大学 | Laser induced discharge reinforcement plasma spectrum detection device |
| CN203310851U (en) * | 2013-05-31 | 2013-11-27 | 中国工程物理研究院化工材料研究所 | Device for measuring average velocity of laser-driven metal flyer |
| CN103712959A (en) * | 2013-11-26 | 2014-04-09 | 清华大学 | Cambered surface electrode discharging-based laser-induced breakdown spectroscopy detection system |
-
2016
- 2016-12-13 CN CN201611144159.6A patent/CN106644407B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009097427A (en) * | 2007-10-17 | 2009-05-07 | Toyota Central R&D Labs Inc | Laser-induced spark discharge ignitor |
| CN101650441A (en) * | 2008-12-15 | 2010-02-17 | 茂名学院 | Method for detecting electron emission of plasma |
| CN101696936A (en) * | 2009-10-22 | 2010-04-21 | 浙江师范大学 | Laser induced discharge reinforcement plasma spectrum detection device |
| CN203310851U (en) * | 2013-05-31 | 2013-11-27 | 中国工程物理研究院化工材料研究所 | Device for measuring average velocity of laser-driven metal flyer |
| CN103712959A (en) * | 2013-11-26 | 2014-04-09 | 清华大学 | Cambered surface electrode discharging-based laser-induced breakdown spectroscopy detection system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109352181A (en) * | 2018-09-28 | 2019-02-19 | 中国工程物理研究院化工材料研究所 | Laser ablation metal material action time test device and method |
| CN109352181B (en) * | 2018-09-28 | 2020-10-23 | 中国工程物理研究院化工材料研究所 | Device and method for testing action time of laser ablation metal material |
| CN112099146A (en) * | 2020-09-21 | 2020-12-18 | 中国科学院长春光学精密机械与物理研究所 | Optical fiber collimation coupling system |
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| CN106644407B (en) | 2020-02-04 |
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