CN202145147U - Measure apparatus of carbon dioxide laser wavelength - Google Patents
Measure apparatus of carbon dioxide laser wavelength Download PDFInfo
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- CN202145147U CN202145147U CN201120239565U CN201120239565U CN202145147U CN 202145147 U CN202145147 U CN 202145147U CN 201120239565 U CN201120239565 U CN 201120239565U CN 201120239565 U CN201120239565 U CN 201120239565U CN 202145147 U CN202145147 U CN 202145147U
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- carbon dioxide
- dioxide laser
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- laser wavelength
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Abstract
The utility model discloses a measure apparatus of a carbon dioxide laser wavelength, comprising an optical system, an electronic system and a scan system; a carbon dioxide laser beam passes through an incident slit, is reflected into a parallel light beam through a first collimated spherical reflector and a focused spherical reflector, and is cast on a rotating plane diffraction grating controlled by a stepping motor through a sine generator; a diffracted beam with the sine relation formed between the wavelength and the rotating angle of the plane diffraction grating is obtained; the beam arrives at a HgCdTe detector through an objective lens, a second collimated spherical reflector and an emitting slit; an emitting optical signal passing through the emitting slit is switched into an electrical signal through the HgCdTe detector; and through amplification and A/D switching, the carbon dioxide laser wavelength is measured after processing by a computer. According to the utility model, the beneficial effects are that the disadvantages of the conventional measure apparatus of the carbon dioxide laser wavelength are overcome; and the carbon dioxide laser wavelength can be conveniently and quickly measured.
Description
Technical field
The utility model relates to a kind of laser wavelength measurement device, particularly a kind of carbon dioxide laser wavelength measurement device.
Background technology
Along with carbon dioxide laser in various fields application more and more widely such as industrial processes, communication, measurement and medical researches, measuring the carbon dioxide laser wavelength is quickly and easily also just becoming a kind of urgent demand.The groundwork material of carbon dioxide laser is by CO
2, N
2With three kinds of gas compositions of He.C0 wherein
2Be the gas that produces laser emission, N
2With He be complementary gas.Laser transition occurs in C0
2Between two vibration one rotational energy levels of molecular electronic ground state.When carbon dioxide laser is worked, because N
2Molecule receives the probability of electron collision very big, therefore is energized into first excited state, its energy and C0 effectively
2On the molecule energy of energy level very near, energy very soon from N2 molecule first excited state resonance transfer to CO
2On the upper laser level, its population is increased.Work as CO
2When energy level forms population inversion with following energy level on the molecule, produce transition through stimulated radiation.But except that vibration, C0
2Molecule also has rotation, so each vibrational energy level can be divided into a series of rotational energy levels, makes the output wavelength of carbon dioxide laser all might occur in the scope of 9-11 μ m.The device of measuring the carbon dioxide laser wavelength parameter at present roughly is divided into several types, and one type is wavemeter, and function is simple; Easy to operate, precision still generally can only be read wavelength data also than higher; When laser instrument was multi-wavelength or spectrum broad, measuring might be inaccurate.One type is scanning F-P chamber, mainly is the spectral shape of research laser instrument, does not generally provide the absolute figure of wavelength.
Summary of the invention
The purpose of the utility model is in order to overcome the shortcoming of existing carbon dioxide laser wavelength measurement device, provide a kind of have powerful, the carbon dioxide laser wavelength measurement device of characteristics such as cost performance is high, measuring accuracy is high, measuring speed is fast, simple to operate.
The technical solution of the utility model is summarized as a carbon dioxide laser wavelength measurement apparatus, characterized by the apparatus including an optical system, electronic system and the scanning system, said optical system comprises a focusing spherical mirror, an objective lens, the entrance slit, the first collimating spherical mirror, plane diffraction grating, the second collimating spherical mirror, the exit slit and mercury cadmium telluride detector; said electronic system including pre-amplifier, a computer, A / D converters and D / A converter; said scanning system is a stepping motor and a sine bodies, sine mechanism through the screw-connected to the plane diffraction grating; light emitted by a carbon dioxide laser beam entering the entrance slit, the entrance slit of the focus of the spherical mirror focal plane of the light beam incident through the entrance slit by the first collimating spherical mirror, focusing spherical mirror into a parallel light beam reflected by the stepping motor toward the control sine mechanism by rotation of the plane diffraction grating, the wavelength of the plane diffraction obtained a sinusoidal grating rotating angle of the diffracted light beams between the diffraction light beams via the objective lens, the second collimating spherical mirror and the exit slit reaches HgCdTe detector through the exit slit of the emitted light signal is converted into a HgCdTe detector signal, the preamplifier amplifies the signal by the A / D converter to convert analog digital, computer processing as measured by the carbon dioxide laser wavelength.
The spectral response of described mercury-cadmium tellurid detector is at 8～14 μ m, and its peak wavelength is 10.6 μ m, is complementary with the optical maser wavelength of CO2 laser instrument.
Described entrance slit, exit slit are straight slit, and width range 0-2mm is adjustable continuously.
Carbon dioxide laser wavelength measurement principle:
The light beam that is sent by the carbon dioxide laser light source gets into the entrance slit that is positioned on the focal plane that focuses on spherical reflector; The light beam of injecting through entrance slit becomes parallel beam to invest on the plane diffraction grating that is rotated through sine mechanism control by stepper motor through the first collimation spherical reflector, focusing sphere mirror reflects; Obtain wavelength becomes sine relation with the plane diffraction grating rotational angle diffracted beam; According to optical principle; Can provide the relation between outgoing wavelength and the grating angle through grating equation, as shown in Figure 1
Grating equation does
Wherein,
is the anglec of rotation of grating;
is the half the of incident angle and angle of diffraction sum;
is a constant concerning given spectrometer; D is a grating constant;
is lambda1-wavelength; M is the order of diffraction time, gets 0, integers such as
1,
2.
The scanning system of the utility model is according to above-mentioned grating equation, and the corner of wavelength and grating becomes sine relation, utilizes the rotation of leading screw in the step motor control sine mechanism, and then the plane diffraction grating rotation is realized.Stepper motor just can rotate an angle behind one group of electric pulse of input, correspondingly a fixing distance is just moved in the leading screw top nut.Every input set of pulses, the rotation of grating just make the optical wavelength of exit slit outgoing change 0.1nm.When grating rotating; Just focus on wavelength optical signals on the exit slit successively; Output light signal strength when mercury cadmium telluride (CdHgTe) detector writes down different grating rotating angles (different angles are represented different wavelengths); Promptly write down spectrum, selected corresponding wavelength to carry out record by output slit.
The beneficial effect of the utility model is; Overcome the shortcoming of existing carbon dioxide laser wavelength measurement device; Characteristics such as can measure the carbon dioxide laser wavelength quickly and easily, this device has powerful, and cost performance is high, measuring accuracy is high, measuring speed is fast, simple to operate; And advantages of small volume, conveniently be integrated into and carry out on-line monitoring in the system.
Description of drawings
Fig. 1 is a grating rotation system synoptic diagram;
Fig. 2 is a carbon dioxide laser wavelength measurement apparatus structure principle schematic.
Embodiment
Shown in Figure 2 A carbon dioxide laser wavelength measurement apparatus including an optical system, electronic system and the scanning system, said optical system comprises a focusing spherical mirror 1, the objective lens 2, the entrance slit 3, the first collimating spherical mirror 4, plane diffraction grating 5, a second collimating spherical mirror 6, the exit slit 7 and 8 HgCdTe detector; said electronic system including pre-amplifier 9, the computer 10, A / D converter 11 and D / A converter 12; said scanning system by the stepper motor 13 and the sine mechanism 14 composed of sine mechanism 14 through the screw and the plane diffraction grating 5 is connected; carbon dioxide laser light emitted from the beam entering the entrance slit 3 , the entrance slit 3 is in the focus of the spherical reflector 1 focal plane of the entrance slit 3 by the light beam incident via the first collimating spherical mirror 4, focusing spherical mirror reflecting a parallel light beam toward a stepping motor through sine mechanism 14 controls the rotation of the plane diffraction grating 5, to obtain the wavelength of plane diffraction grating 5 of the rotation angle between a sine diffracted beam, the diffractive beam through the objective lens 2, the second collimating spherical mirror 6 and the exit slit 7 Time Te cadmium, mercury and the detector 8 through the exit slit 7 of the optical signal emitted by the mercury cadmium telluride detector 8 is converted into an electrical signal, the electrical signal amplified by the pre-amplifier 9 the A / D converter 11 of the analog digital converter, the computer 10 processes the measured carbon dioxide laser wavelengths.The spectral response of described mercury-cadmium tellurid detector 8 is at 8～14 μ m, and its peak wavelength is 10.6 μ m, is complementary with the optical maser wavelength of CO2 laser instrument.Described entrance slit 3, exit slit 7 are straight slit, and width range 0-2mm is adjustable continuously.The gain of prime amplifier 9 can be provided with by Control Software as required, and the gain of prime amplifier is 1,2 at present ..., 7 seven class, the big more Amplifier Gain of number is high more.
Said scanning system is made up of stepper motor 13 and sine mechanism 14, and scan control is to utilize the rotation of leading screw in the step motor control sine mechanism, and then the grating rotation is realized.Stepper motor just can rotate an angle behind one group of electric pulse of input, the nut on the corresponding leading screw just moves a fixing distance.Every input set of pulses, the rotation of grating just make the optical wavelength of exit slit outgoing change 0.1nm.The measurement parameter of the utility model: 9.1 μ m are to the CO of 11.3 μ m
2Optical maser wavelength.
Claims (3)
1 A carbon dioxide laser wavelength measuring device, characterized in that the apparatus includes an optical system, electronic system and the scanning system, said optical system comprises a focusing spherical mirror (1), an objective lens (2), the entrance slit ( 3), the first collimating spherical mirror (4), a flat diffraction grating (5), the second collimating spherical mirror (6), the exit slit (7) and mercury cadmium telluride detector (8); wherein The electronic system includes the pre-amplifier (9), the computer (10), A / D converter (11) and D / A converter (12); said scanning system by a stepping motor (13) and a sine means ( 14) composed of sine mechanism (14) by means of the screw and the plane diffraction grating (5) is connected to; light emitted by a carbon dioxide laser beam entering the entrance slit (3), the entrance slit (3) located at a focusing spherical mirror (1 ) in the focal plane through the entrance slit (3) of the beam incident through the first collimating spherical mirror (4), focusing spherical mirror (1) into a parallel light beam reflected by the stepper motor through invest sine mechanism (14 ) control the rotation of the plane diffraction grating (5), we obtain the wavelength of plane diffraction grating (5) the relationship between rotation angle of a sinusoidal diffraction light beams, the diffracted beams via the objective lens (2), the second collimating spherical mirror (6) and the exit slit (7) reaches HgCdTe detector (8), through the exit slit (7) of the optical signal emitted by the mercury cadmium telluride detector (8) is converted into electrical signals, electrical signals preamplifier (9) Enlarge the A / D converter (11) of the analog digital converter, the computer (10) processing the measured carbon dioxide laser wavelength.
2. carbon dioxide laser wavelength measurement device according to claim 1 is characterized in that, the spectral response of described mercury-cadmium tellurid detector is at 8～14 μ m, and its peak wavelength is 10.6 μ m, is complementary with the optical maser wavelength of CO2 laser instrument.
3. carbon dioxide laser wavelength measurement device according to claim 1 is characterized in that described entrance slit, exit slit are straight slit, and width range 0-2mm is adjustable continuously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120239565U CN202145147U (en) | 2011-07-08 | 2011-07-08 | Measure apparatus of carbon dioxide laser wavelength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120239565U CN202145147U (en) | 2011-07-08 | 2011-07-08 | Measure apparatus of carbon dioxide laser wavelength |
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|---|---|
| CN202145147U true CN202145147U (en) | 2012-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120239565U Expired - Fee Related CN202145147U (en) | 2011-07-08 | 2011-07-08 | Measure apparatus of carbon dioxide laser wavelength |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620827A (en) * | 2012-03-28 | 2012-08-01 | 北京理工大学 | Raster imaging spectrometer |
| JP7472637B2 (en) | 2020-05-08 | 2024-04-23 | 株式会社島津製作所 | Spectrometer |
-
2011
- 2011-07-08 CN CN201120239565U patent/CN202145147U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620827A (en) * | 2012-03-28 | 2012-08-01 | 北京理工大学 | Raster imaging spectrometer |
| CN102620827B (en) * | 2012-03-28 | 2014-06-25 | 北京理工大学 | Raster imaging spectrometer |
| JP7472637B2 (en) | 2020-05-08 | 2024-04-23 | 株式会社島津製作所 | Spectrometer |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120215 Termination date: 20150708 |
|
| EXPY | Termination of patent right or utility model |