CN1030476A - The optical pressure determination method and the instrument of laser beam energy - Google Patents
The optical pressure determination method and the instrument of laser beam energy Download PDFInfo
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- CN1030476A CN1030476A CN 88105433 CN88105433A CN1030476A CN 1030476 A CN1030476 A CN 1030476A CN 88105433 CN88105433 CN 88105433 CN 88105433 A CN88105433 A CN 88105433A CN 1030476 A CN1030476 A CN 1030476A
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- laser beam
- coil
- energy
- framework
- pressure
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Abstract
The optical pressure determination method of laser beam energy and instrument are used to measure the energy of pulse laser beam, belong to laser technology, and it is that to produce optical pressure with laser beam incident to body surface be foundation, the amount meter of a kind of novel Laser Measurement beam energy of making.But the calibration of its self calibration, the reaction time is rapid, does not interdict light beam, with Laser Measurement Shu Wuguan.Be applicable to the energy of the extremely short pulse laser beam of measuring higher-energy; Can be used for measuring bigger laser beam power at configuration rotary body optical gate, measurement result is directly represented by voltage, and is simple in structure, practical.
Description
The present invention is used for the energy of Laser Measurement bundle, belongs to laser technology field.
Current than macro-energy short pulse and the laser instrument of ultra-short pulse laser bundle output constantly succeed in developing, for the performance that improves laser instrument and the application of expansion of laser light device, need seek a kind of to the extremely short pulse laser beam energy measure, easily and effectively amount meter.At present the instrument of the Laser Measurement beam energy that uses, be divided into two classes usually: a kind of is photo-thermal effect type such as charcoal bucket thermojunction type; Another kind is photoelectric effect type such as silicon photocell, photoelectric tube etc.They all must be through the calibration calibration.For photo-thermal effect amount meter, heat conduction to thermopair needs the certain reaction time during measurement; For photoelectric effect amount meter, relevant during measurement with the laser beam wave band.They are for the measurement of little energy laser beam, beyond doubt effectively with easily, but for the laser beam that has than macro-energy, the energy measurement of particularly extremely short pulse laser beam then often brings instability and bigger error is arranged, and eliminating these errors needs some auxiliary aligning gear and equipment.People know that light beam can regard a branch of photon stream with momentum as.When illumination was mapped on the body surface, light will impose on pressure-optical pressure of object.This by Einsteinian quantum light theory illustrated and by the optical pressure of NIKOLAY LEBEDEV experiment is confirmed.Certainly optical pressure is very faint, and after laser occurs, the measurement of optical pressure will not be very difficult thing.1964, people such as M.Stimler (M.Stimler, Z.T.Slawsky and R.F.Gran than.R.S.I Vol35, P311(1964)) designed＜Torsion Pendulum Photometer＞, utilize optical pressure to come the energy of measuring beam, but this design is very inconvenient on measuring, poor practicability, so that do not become the gauging instrument of the actual use of Laser Measurement beam energy.
The object of the present invention is to provide a kind of new method of utilizing the light pressure measurement laser beam energy, it passes through custom-designed pressure of laser light energy meter, and makes measurement easy.
Characteristics of the present invention are by custom-designed pressure of laser light energy meter, pressure of laser light is converted to the rotation of a rotation system, convert induction electromotive force to by the coil cutting magnetic line in the rotation system, record the voltage drop V of induction electromotive force on external resistance R
Max, by laser beam energy E and V
MaxRelational expression can draw laser beam energy E, it and V
MaxBe directly proportional, i.e. E=AV
Max, the sensitivity of scale-up factor A reaction energy meter, relevant with parameters such as some mechanics of energy meter and electromagnetics.When measuring short-pulse laser beam energy (pulsewidth of pulse laser beam＜＜free period of rotation system), if only consider the transmission coefficient t of pressure of laser light energy meter entrance window
1(it approaches total transmissivity or transmission coefficient is very high), and do not consider the reflection (transmission coefficient is very high, reflects very little) of exit window, when plane total reflective mirror and frame plane angle at 45, scale-up factor
A= (CI(r+R))/(NBS1T
1(2+R
1R
2-R
1)R)
C is the light velocity in the formula, and I is the moment of inertia of rotation system, and r is the internal resistance of coil, and R is the resistance of external circuit, and N is the number of turn of coil, and S is the area that coil surrounded, and B is the magnetic induction density of coil present position uniform magnetic field, R
1And R
2Be plane total reflective mirror M
1And M
2Reflection coefficient, l is the distance (M of total reflective mirror to the rotation system central shaft
1And M
2Half of spacing).When the transmission coefficient t of considering the energy meter entrance window simultaneously
1Primary event coefficients R with exit window
3The time, scale-up factor A can be expressed from the next:
A= (CI(r+R))/(NBS1T
1[(2+R
1R
2-R
1)+R
1R
2R
3(2+R
1R
2-R
2)]R)
Pressure of laser light energy meter of the present invention is made up of framework, coil, transmission window and plane total reflective mirror, its characteristics are and can connect with coil around the non magnetic framework that central shaft rotates, coil is placed in the magnetic field, two parallel relative plane total reflective mirrors are settled in the framework both sides, they and frame plane angle at 45, frame center axle up and down two ends with the tensioning of two elasticity torsion wires.When a pulse laser beam passes through entrance window T
1Transmission is also incided first total reflective mirror M perpendicular to frame plane
1After, through M
1Reflex to second total reflective mirror M
2, then by M
2Reflex to exit window T
2Outgoing is done the time spent at pulse laser beam, makes rotation system obtain rotating torque from laser beam, and the rotation of framework makes coil cutting magnetic line and produces induction electromotive force, and produces voltage drop on external resistance.
The present invention does not need to place vacuum state to use the pressure of laser light energy meter, only needs directly to measure output voltage values during measurement, therefore uses very convenient.The present invention has following characteristics: 1. can calibrate by self calibration; 2. it is rapid to measure the reaction time, is specially adapted to the energy measurement of nanosecond, psec even shorter pulse laser beam; 3. do not interdict light beam when measuring, because the laser beam energy loss is very little in measurement, so laser beam still can be used during measurement; 4. measure with the laser beam wave band irrelevant.The pressure of laser light energy meter both can be used for laser beam energy to be measured, if dispose the rotary body optical gate, also can be used for the power measurement of continuous laser beam.Energy meter construction design method of the present invention can also be used to measure micro-torque, little vibration and air pulse amount etc.
Fig. 1 is the rotation system synoptic diagram; Fig. 2 is a pressure of laser light energy meter synoptic diagram.
The present invention can adopt following scheme implementation: according to structure fabrication pressure of laser light energy meter illustrated in figures 1 and 2, two plane total reflective mirror M
1And M
2The parallel both sides that relatively are fixed on the non magnetic framework (1) of rotation system, preferably make the angle at 45, plane of total reflective mirror plane and framework (1), the downside of framework (1) and coil (2) link, the two ends of coil (2) link to each other with (4) with the elasticity torsion wire (3) at rotation system central shaft two ends respectively, so that realize being electrically connected with the resistance R of external circuit, coil (2) places uniform magnetic field, and uniform magnetic field can be made of iron core (5) and magnet (6).Whole rotation system is with having entrance window D
1With exit window D
2Shell (7) sealing, can vacuumize, can not vacuumize yet.During the Laser Measurement beam energy, as long as measure first maximum impulse voltage V that coil external resistance R two ends produce
Max, can be by E=AV
MaxRelational expression obtain laser beam energy E, scale-up factor A has reflected the sensitivity of pressure of laser light energy meter, it is only relevant with each parameter in the pressure of laser light energy meter structure, these parameters all are mechanics and electromagnetic fundamental quantity, can measure with exact instrument.The sensitivity of pressure of laser light energy meter can accomplish that every joule has the output of tens microvolt voltages.Its measuring error is decided by the measuring error of parameter and voltage, and the measurement lower limit of pressure of laser light energy meter is tens of millijoules, measures the upper limit and is decided by laser beam energy density or the power density that the diaphotoscope of completely reflecting mirror and transmission window can bear.
Claims (4)
1, a kind of measuring method that is used to measure laser beam energy, it is characterized in that the laser beam optical pressure is converted to the rotation of rotation system framework, convert induction electromotive force to by the coil cutting magnetic line that is fixed on the framework again, measure the voltage drop V of induction electromotive force on external resistance R
Max, then can be by E=AV
MaxDraw laser beam energy E, wherein the sensitivity of scale-up factor A reflected measurement equipment.
2, measuring method according to claim 1, it is characterized in that forming by framework, coil, transmission window and plane total reflective mirror as the pressure of laser light energy meter of measuring equipment, can connect with coil around the non magnetic framework that central shaft rotates, coil is placed in the magnetic field, two parallel relative plane total reflective mirrors are settled in the framework both sides, they and frame plane angle at 45, frame center axle up and down two ends with the tensioning of two elasticity torsion wires.
3, measuring method according to claim 1 and 2, the whole rotation system that it is characterized in that the pressure of laser light energy meter is with having entrance window D
1With exit window D
2Shell seal, the two ends of coil (2) are connected with external resistance R with (4) by the elasticity torsion wire (3) at rotation system central shaft two ends.
4, measuring method according to claim 3 is characterized in that the residing uniform magnetic field of coil (2) in the pressure of laser light energy meter is formed by iron core (5) and magnet (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105433 CN1012282B (en) | 1988-07-18 | 1988-07-18 | Light pressure measurement method for laser beam energy and apparatus there of |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105433 CN1012282B (en) | 1988-07-18 | 1988-07-18 | Light pressure measurement method for laser beam energy and apparatus there of |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1030476A true CN1030476A (en) | 1989-01-18 |
| CN1012282B CN1012282B (en) | 1991-04-03 |
Family
ID=4833626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88105433 Expired CN1012282B (en) | 1988-07-18 | 1988-07-18 | Light pressure measurement method for laser beam energy and apparatus there of |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1012282B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451578C (en) * | 2003-11-27 | 2009-01-14 | 北京光电技术研究所 | Measuring system and method for wave zone laser energy/power |
| CN102322951A (en) * | 2011-08-15 | 2012-01-18 | 西北核技术研究所 | Method for measuring high energy laser energy parameter based on light pressure principle and apparatus thereof |
| CN104700696A (en) * | 2014-12-09 | 2015-06-10 | 中国科学技术馆 | Light pressure demonstration instrument |
| CN105571770A (en) * | 2016-01-19 | 2016-05-11 | 西北工业大学 | Light pressure calibration apparatus based on gravity, and calibration method thereof |
| TWI738225B (en) * | 2020-01-16 | 2021-09-01 | 鴻海精密工業股份有限公司 | Light pressure measuring device and method for measuring light pressure |
-
1988
- 1988-07-18 CN CN 88105433 patent/CN1012282B/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451578C (en) * | 2003-11-27 | 2009-01-14 | 北京光电技术研究所 | Measuring system and method for wave zone laser energy/power |
| CN102322951A (en) * | 2011-08-15 | 2012-01-18 | 西北核技术研究所 | Method for measuring high energy laser energy parameter based on light pressure principle and apparatus thereof |
| CN102322951B (en) * | 2011-08-15 | 2013-04-17 | 西北核技术研究所 | Method for measuring high energy laser energy parameter based on light pressure principle and apparatus thereof |
| CN104700696A (en) * | 2014-12-09 | 2015-06-10 | 中国科学技术馆 | Light pressure demonstration instrument |
| CN105571770A (en) * | 2016-01-19 | 2016-05-11 | 西北工业大学 | Light pressure calibration apparatus based on gravity, and calibration method thereof |
| CN105571770B (en) * | 2016-01-19 | 2018-04-06 | 西北工业大学 | A kind of optical pressure caliberating device and scaling method based on gravity |
| US10378990B2 (en) | 2016-01-19 | 2019-08-13 | Northwestern Polytechnical University | Gravity-based light pressure calibrating device and corresponding method |
| TWI738225B (en) * | 2020-01-16 | 2021-09-01 | 鴻海精密工業股份有限公司 | Light pressure measuring device and method for measuring light pressure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1012282B (en) | 1991-04-03 |
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