CN86203822U - High speed, multi-amplitude, fourier storing type dynamic halographic interferometer - Google Patents
High speed, multi-amplitude, fourier storing type dynamic halographic interferometer Download PDFInfo
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- CN86203822U CN86203822U CN 86203822 CN86203822U CN86203822U CN 86203822 U CN86203822 U CN 86203822U CN 86203822 CN86203822 CN 86203822 CN 86203822 U CN86203822 U CN 86203822U CN 86203822 U CN86203822 U CN 86203822U
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- interferometer
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Abstract
The utility model provides a high speed multi-amplitude Fourier storing type dynamic holographic interferometer which comprises a holographic light path. The utility model is characterized in that the interferometer is provided with a laser device, a pulse modulator, an acoustooptic modulation high-density synchronous dot array recording device or a drum rotation type recording device, wherein, the laser device continuously outputs laser, and the pulse modulator can output order dipulse in which the pulse width, the spacing of the two pulses in a pulse pair and the spacing among the pulse pairs are all adjustable. The utility model can incept a holographic interference pattern or hundreds of holographic interference patterns, the sampling time of which is a subnanosecond grade, to the same transient state process for realizing sample taking of time series to the transient state overall process.
Description
The present invention relates to particularly a kind of high speed of a kind of dynamic holographic interferometer, several, Fuli's leaf storage type dynamic holographic interferometer.
All to adopt monopulse or dipulse ruby laser be light source to dynamic holographic interferometer in the prior art, once only can to tested process take the photograph a width of cloth holographic interference pattern.Though the sequence pulsed ruby laser is arranged, because of it is not that train pulse is right, thus can only records series single exposure hologram, can not get the sequence holographic interference pattern.Therefore existing dynamic holographic interferometer can not be taken several holographic interference patterns of same process to transient flow field.
The purpose of this invention is to provide a kind of can be a dynamic holographic interferometer to hundreds of width of cloth holographic interference pattern of subnanosecond level to same transient process picked-up sample time.To realize to transient state overall process time-series sampling.
The present invention is achieved in that at a high speed, several, Fuli's leaf storage type dynamic holographic interferometer comprises holographic light path, it is characterized in that having laser instrument, pulse-modulator, acousto-optic modulator synchronized recording devices lattice or the drum rotary type pen recorder of output laser continuously.The laser instrument of output laser sends the good continuous laser beam of coherence continuously, the pulse modulated device be modulated to the interval of pulse width, internal two pulses of pulse and pulse pair and pulse between all adjustable at interval sequence double pulse laser, its pulse is controlled to number.This laser beam is divided into reference light and object beam through spectroscope, and object beam after expanding bundle, collimation, makes it pass through to be measured again, the portable information with field to be measured of this light beam.Existing dynamic holographic interferometer is just joined recorded hologram with this wide beam light wave and reference light.The present invention again through fourier transform lens, obtains the frequency spectrum of thing light wave in lens focus in image space zone after a while to this wide beam thing light wave, and itself and the reference light that does not expand bundle are joined, and notes the fourier spectrum of thing light.The re-expose method just makes object beam after a pair of pulse laser beam splitting by to be measured before and after changing, and changes the interferogram that causes to obtain to be measured.Object beam luminous energy density behind fourier transform strengthens greatly, and reference light is without expanding bundle, thus make the holographic recording medium time shutter shorten to microsecond, down to tens nanoseconds.Adopt acousto-optic modulator synchronized recording devices lattice at thing optical spectrum and reference light intersection, one of a dynamic process can be recorded on the same holographic recording medium with dot matrix way to hundreds of width of cloth holographic interference pattern, perhaps adopt drum rotary type pen recorder to carry out high density recording.
The present invention compared with prior art, its distinguishing feature is to have adopted the laser instrument of the good continuous output laser of coherence as light source, has saved expensive ruby laser; Adopt right internal two recurrent intervals of each pulse width, pulse of the pulse laser of pulse-modulator output and pulse pair and pulse between the interval all can in a big way, regulate, and laser pulse is to more (reach hundreds of to), thereby can write down one to hundreds of width of cloth holographic interference pattern; Utilize fourier spectrum type record to shorten the time shutter, every width of cloth holographic interference pattern time shutter is as short as the subnanosecond level and carries out high-speed photography, and every width of cloth interferogram is the point-like record, has saved hologram recording material widely; The present invention is widely used in high speed, several holographic interference photographies of various dynamic processes.
With two embodiment the present invention is further described respectively below in conjunction with accompanying drawing.
Fig. 1 is the schematic diagram that the present invention utilizes acousto-optic modulator synchronized recording devices lattice.
Fig. 2 is the schematic diagram that the present invention utilizes drum rotary type pen recorder.
With reference to Fig. 1, the continuous laser beam that sends by continuous wave laser (1) by spatial filter (2) filtering after, the pulse-modulator of selecting the control power supply (4) and the electro-optic crystal (3) of circuit, the series connection of high voltage pulse amplifying circuit to form via program control signal generation circuit, delay circuit, dipulse signal generating circuit, dipulse be modulated to pulse width, internal two recurrent intervals of pulse and pulse pair and pulse between all adjustable sequence double pulse laser in interval.This laser beam is divided into reference light and object beam through spectroscope (5), object beam is expanded into the heavy caliber parallel beam through the beam-expanding system of beam expanding lens (7) and collimating mirror (8) composition, this light beam arrives fourier transform lens (10) by to be measured (9), under the effect of the beam system that contracts that fourier transform lens (10) and collimation lens (11) are formed, the outgoing beam diameter is millimetre-sized parallel light pencil.This light pencil enters acousto-optic crsytal (12).Because spectroscope (5) is positioned between electro-optic crystal (3) and the beam expanding lens (7),,, enter another acousto-optic crsytal (15) by the reflection of total reflective mirror (6) so restraint without expanding by the reference light of spectroscope (5) reflection.The acousto-optic crsytal here (12) and acousto-optic crsytal (15) are identical and by isochronous controller (17) control, carry out synchronous scanning, and then the light beam of two acousto-optic crsytal outgoing is parallel all the time.Through lens (13), go up generation at the holographic recording medium (14) that is positioned at lens (13) focal plane and interfere again, carry out the dot matrix record, thereby obtain Fuli's leaf storage type holographic interference pattern.
With reference to Fig. 2, the light path system of drum rotary type pen recorder and the light path system of Fig. 1 are basic identical, just between to be measured (9) and drum rotary type pen recorder (16), add fourier transform lens (10), and the thing optical spectrum of (defocusing amount is 0.1～0.01 times of focal length of transform lens (10)) is joined on the holographic recording medium face on the drum rotary type pen recorder (16) with the reference light that does not expand Shu Bingjing total reflective mirror (6) reflection in after a while zone of fourier transform lens (10) focus in image space, notes the frequency spectrum of thing light wave.When drum rotary type pen recorder adopts change speed motor, its rotating speed is adjustable continuously, and and the pulse width of the pulse laser modulated of pulse-modulator, pulse pair and pulse between the interval consistent neither overlap unlikely again separation between any two and open very much so that be fixed on the holographic interference pattern that holographic recording medium write down on the pen recorder (16).
Claims (6)
1, a kind of high speed, several, Fuli's leaf storage type dynamic holographic interferometer comprises holographic light path, it is characterized in that having laser instrument, pulse-modulator, acousto-optic modulator synchronized recording devices lattice or the drum rotary type pen recorder of output laser continuously.
2, hologram-interferometer according to claim 1 is characterized in that pulse-modulator is connected with electro-optic crystal (3) the control power supply (4) of selecting circuit, the series connection of high voltage pulse amplifying circuit by program control signal generation circuit, delay circuit, dipulse signal generating circuit, dipulse to form.
3, hologram-interferometer according to claim 1 is characterized in that the spectroscope (5) of holographic light path is positioned between electro-optic crystal (3) and the beam expanding lens (7).
4, the beam system of forming by fourier transform lens (10) and collimation lens (11) or of contracting of connecting between the hologram-interferometer according to claim 1, (9) to be measured that it is characterized in that holographic light path and acousto-optic crsytal (12) at the fourier transform lens (10) of connecting between field to be measured (9) and the drum rotary type pen recorder (16).
5, hologram-interferometer according to claim 1 is characterized in that acousto-optic modulator synchronized recording devices lattice is made up of two identical acousto-optic crsytals (12) (15), lens (13), isochronous controller (17) and holographic recording medium (14).
6, hologram-interferometer according to claim 1 is characterized in that the motor of drum rotary type pen recorder (16) is a change speed motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86203822 CN86203822U (en) | 1986-05-30 | 1986-05-30 | High speed, multi-amplitude, fourier storing type dynamic halographic interferometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86203822 CN86203822U (en) | 1986-05-30 | 1986-05-30 | High speed, multi-amplitude, fourier storing type dynamic halographic interferometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86203822U true CN86203822U (en) | 1987-07-01 |
Family
ID=4807034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86203822 Ceased CN86203822U (en) | 1986-05-30 | 1986-05-30 | High speed, multi-amplitude, fourier storing type dynamic halographic interferometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86203822U (en) |
-
1986
- 1986-05-30 CN CN 86203822 patent/CN86203822U/en not_active Ceased
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| C06 | Publication | ||
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right |