Carrier frequency multiplexing color digital holographic imaging device and method

Abstract

The invention provides a carrier multiplexing color digital holographic imaging device and method. Tricolor incident laser combined into a beam is divided into two beams by a first non-polarization splitting prism, one beam sequentially passes through a first collimation beam expansion system, a first reflecting mirror and an objected to be texted and then irradiates a third non-polarization splitting prism, the other beam is sequentially and optically adjusted and then is divided into tricolor beams by a second color combination prism, the tricolor beams respectively irradiate three planar reflecting mirrors and are reflected and then are combined to a beam by the second color combination prism, the beam irradiates a second non-polarization splitting prism, is reflected by the second non-polarization splitting prism and then irradiates a third non-polarization splitting prism, the beam is gathered at the third non-polarization splitting prism and irradiates an image sensor to form a hologram for multiplexing three carriers, the image sensor acquires the hologram and uploads the hologram to a computer for calculation and complete imaging. A structure of which three beams sharing an optical path is employed, and the device is simple in structure and good in stability; and moreover, only a black-and-white image sensor is needed to record the hologram, and the separation of three wavelength holograms is completed by a simple algorithm.

Description

technical field [0001] The invention belongs to the field of color digital holographic imaging, in particular to a carrier frequency multiplexing color digital holographic imaging device and method. Background technique [0002] Color digital holographic imaging technology is a holographic technology that can record and reproduce the color of the original object and has a three-dimensional image. Because the color hologram can more truly reflect the original information of the object than the monochrome hologram, it has a broader application prospect in holographic measurement and display, so it has attracted extensive attention. [0003] Patent CN101452253B "A Method for Acquiring Color Digital Holograms" utilizes black-and-white area array CCD and multi-recording wavelength lensless Fourier transform hologram recording optical path to realize three-color digital holographic imaging, but this method still needs to record each wavelength separately Holograms, and complex al...

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Problems solved by technology

[0003] Patent CN101452253B "A Method for Acquiring Color Digital Holograms" utilizes black-and-white area array CCD and multi-recording wavelength lensless Fourier transform hologram recording optical path to realize three-color digital holographic imaging, but this method still needs to record each wavelength separately Holograms, and require complex algorithms to reproduce imaging, poor real-time performance

[0004] Patent CN106569402A "A Color Separation and Digital Processing Method for Multi-Wavelength Digital Holograms" first uses a Bayer-type color camera to separately collect single-wavelength digital holograms of objects under three-color laser irradiation, and obtains the crosstalk coefficient between the three colors through numerical processing Matrix; then collect multi-wavelength digital holograms irradiated by three-color lasers at the same time, and use the crosstalk coefficient matrix to eliminate the crosstalk between the three channels caused by the incomplete selectivity of Bayer color filters to different wavelengths of light, realizing a single digital hologram holographic Figure 1 Record information of multiple wavelengths at one time, but this method not only has high cost, low resolution, but also complicated operation, and repeated calibration is required for different objects

[0005] Patent CN105717774A "A device and method for real-time recording of color digital holograms" under the condition that the illumination angles of the object beams are consistent, the irradiation angles of the reference beams are adjusted respectively, and holograms containing different carrier frequencies of each wavelength are obtained through one exposure to realize dynamic Real-time holographic recording of colored objects, but the light beams of each wavelength of the device pass through different positions in space, which not only results in a large and complex structure, but also makes adjustment difficult

[0006] French SONG Qinghe et al. (Song Q, Wu Y, Tankam P, et al.Research on therecording hologram with Foveon in digital color holography[C] / / PhotonicsAsia.International Society for Optics and Photonics,2010) use color camera to record hologram, The light beams of each wavelength can share one optical path, which greatly simplifies the system structure and reduces the complexity of system operation, but because of the use of color cameras, not only the cost is high, but also complex algorithms are required to suppress the crosstalk between each wavelength

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