Pulse grid coherent chromatography method

A technology of coherent tomography and pulsed light, which is applied in the direction of phase influence characteristic measurement, etc., can solve problems such as difficult tomography imaging and thin material tomography imaging, and achieve fast sampling speed, low requirements on spectral width and pulse width , the effect of high sensitivity

Inactive Publication Date: 2010-02-03
CHONGQING UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

[0009]The above-mentioned tomographic methods are mainly used for tomographic imaging of organisms and mechanical structures; their common disadvantage is that it is difficult to apply to a large-scale (such as tens of kilometers) layer It is also difficult to be used for tomographic imaging of rare substances such as atmospheric clouds and liquids

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Embodiment 1

[0036] Embodiment one: the application embodiment of pulse grating coherence tomography method of the present invention is: (1) use superradiance laser diode (SLD) synthetic light source as broadband low-coherence light source, its central wavelength is 1550nm, and output optical power is 200mW The output light of the light source is coupled to a balanced Mach-Zehnder (MZ) optical modulator with an optical isolator, and the modulation signal of the optical modulator is adjusted so that it outputs pulsed light with a pulse width of 5 ns and an interval of 100 s, or with The ultra-broadband light source with an internal modulator directly outputs pulsed light that meets the requirements; the pulsed light is divided into at least two beams by a semi-transparent mirror with a split ratio of 50:50 and a broadband dielectric film, one of which is projected The reflected light in the suspended particle area returns to the semi-transparent mirror and is used as the signal light; anothe...

Embodiment 2

[0037] Embodiment two: see figure 1 , the present embodiment of the pulse grating coherence tomography method is: (1) use the ultrashort pulse light outputted by a low-energy Ti:sapphire femtosecond laser with an isolator or other short pulse light source as the pulse light source 1, the ultrashort pulse light of the ultrashort pulse light The pulse width is 240fs, the central wavelength is 800nm, the spectral width is 10nm, the single pulse energy is less than 2nJ, and the repetition frequency is 1kHz; the ultrashort pulse light is collimated and expanded by the collimator beam expander 2, and then transmitted to the beam splitting ratio The semi-transparent half-mirror C1 of 50:50 broadband dielectric film splits light, wherein a beam of light O1 is projected onto the tomographic suspended particle area 5, and the reflected light of the suspended particle area 5 returns to the half-transparent half-mirror C1 and As a signal light; another beam of light O2 is incident into a ...

Embodiment 3

[0038] Embodiment three: see figure 2 , the present embodiment of pulse grid coherence tomography method is: (1) the same as (1) in embodiment one or embodiment two; (2) the same as (2) in embodiment one or embodiment two; ( 3) The difference from (3) in Embodiment 2 is: in the data acquisition and processing system 6, the rising edge of the reference electrical signal S2 is aligned with the peak value of the electrical signal pulse train S1 (available time delay circuit D), the signal after the alignment of the reference electrical signal S2 is used as the sample-hold switch control signal H (also called the sampling time control signal) of the sampler A (including sampling, holding and analog-to-digital conversion functions), and the signal electric pulse The string S1 is sampled and stored in the memory M according to the order of sampling and scanning positions, and the sampled values ​​stored in the memory M are reconstructed according to the order of sampling and scanni...

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Abstract

The invention discloses a pulse grid coherent chromatography method comprising the following steps: dividing low coherent pulse light into at least two beams, wherein one light beam enters chromatography matters, and distribution reflected light is signal light; the other light seam is magnified by cyclic repeating split light or split light combined light to generate a pulse grid, the pulse gridand the signal light generate interference and form a signal light pulse string, and the signal light pulse string comprises the reflected light distribution of the chromatography matters to representchromatography information. The pulse grid coherent chromatography method has large chromatography range, high sensitivity as well as simple and quick reconstitution of the chromatography information, is suitable for the chromatography imaging of the continuous scattering matters and the distribution sensing of parameters of biology, chemistry, physics, and the like.

Description

technical field [0001] The invention belongs to the technical field of image tomography and optical distribution sensing, and in particular relates to a pulse grid coherent tomography method and a tomography device. Background technique [0002] Geological earthquakes, large-scale structures and buildings (such as oil wells, high-voltage power grids, mines, tunnels, bridges, hydraulic projects, aircrafts), etc. require distributed monitoring of stress / strain, deformation, etc. to determine their health status, and also require distributed monitoring of temperature to prevent fires . Biochemical physics, medicine and diagnosis, atmosphere or clouds, ocean, national defense and military, etc. need tomography to obtain multidimensional distribution or tomography of biology, chemical physics, tissue cells and their lesions, atmosphere, ocean or seabed, military targets, etc. (tomographic) image information. The acquisition of these tomographic images and large-scale field dist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/45
Inventor 曾祥楷
Owner CHONGQING UNIV OF TECH
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