Multi-color off-axis digital holographic system and the imaging method thereof

A multi-color off-axis digital holographic imaging method, comprising the steps of:

• (A) enabling a color imaging device to obtain a red, a green, and a blue holograms by the use of a red beam, a green beam, and a blue beam, respectively, by receiving a reflected reference beam combined with a scattered object beam resulting from light being scattered by a sample, and directing this combined beam containing holographic interference signals to the surface of the color imaging device to form a hologram;
• (B) zero-filling the obtained red, green, and blue holograms respectively, to adjust the resolutions of each hologram having different wavelengths to a uniform hologram image array size by defining the uniform hologram image array size for holograms obtained from beams of different wavelengths and setting a reconstruction distance;
• (C) reconstructing the zero-filling-treated red, green, and blue holograms using the reconstruction distance, the size and pixel size of the color imaging device, and a phase mask for compensating for lens aberration, so as to obtain phase information of the red, green, and blue beam, respectively;
• (D) obtaining a three-dimensional surface profile with respect to a RG synthetic wavelength according to a calculation using the phase information of the red and the green beams as well as the wavelengths thereof while also obtaining a three-dimensional surface profile with respect to a GB synthetic wavelength according to a calculation using the phase information of the green and the blue beams as well as the wavelengths thereof;
• and
• (E) performing a calculation using the RG synthetic wavelength and its phase as well as the GB synthetic wavelength and its phase so as to obtain an overall three-dimensional surface profile with respect to a complete synthetic wavelength.

A multi-color off-axis digital holographic system, comprising:

• a plurality of light emitting diodes, for providing a red (R) beam, a green (G) beam and a blue (B) beam;
• an interference object lens module, for receiving the R, G, and B beams and generating a beam containing an interference signal comprising:
• three beam splitters, for receiving the R, G, and B beams while splitting the same into an object beam and a reference beam;
• an object lens, for receiving the object beam while directing the same to project upon a sample where it is scattered into a scattered object beam and projected back to the object lens;
• and
• a reflection mirror, for receiving and thus reflecting the reference beam in a manner that the reflected reference beam is combined with the scattered object beam into the beam containing the interference signal;
• a color imaging device, for receiving the beam containing the interference signal and forming a hologram on a surface of the color imaging device by holographic interference while registering the hologram;
• and
• a processing device, for zero-filling the obtained red, green, and blue holograms respectively, to adjust the resolutions of each hologram having different wavelengths to a uniform hologram image array size by defining the uniform hologram image array size for holograms obtained from beams of different wavelengths and setting a reconstruction distance and receiving the registered hologram from the color imaging device to perform a reconstruction operation using the reconstruction distance, the size and pixel size of the color imaging device, and a phase mask for compensating for lens aberration, obtaining phase information of the red, green, and blue beam, respectively.

A multi-color off-axis digital holographic system, comprising:

• a plurality of light emitting diodes, for providing a red (R) beam, a green (G) beam and a blue (B) beam;
• an interference object lens module, for receiving the R, G, and B beams and generating a beam containing an interference signal comprising:
• four beam splitters for receiving and splitting the R, G, and B beams into an object beam and a reference beam by utilizing three of said four beam splitters;
• an object lens, for receiving the object beam while directing the same to project upon a sample where it is scattered into a scattered object beam and projected back to the object lens;
• and
• two reflection mirrors, for receiving the object beam and the reference beam in respective and generating a beam containing an interference signal;
• a color imaging device, for receiving the beam containing the interference signal and forming a hologram on a surface of the color imaging device by holographic interference while registering the hologram;
• and
• a processing device, for zero-filling the obtained red, green, and blue holograms respectively, to adjust the resolutions of each hologram having different wavelengths to a uniform hologram image array size by defining the uniform hologram image array size for holograms obtained from beams of different wavelengths and settin a reconstruction distance, and receiving the registered hologram from the color imaging device to perform a reconstruction operation using the reconstruction distance, the size and pixel size of the color imaging device, and a phase mask for compensating for lens aberration, obtaining phase information of the red, green, and blue beam, respectively.