研究目的
To propose a technique of multispectral incoherent holography that measures differential wavefront curvature and applies the principle of Fourier transform spectrometry to provide a set of spectral components of three-dimensional images and continuous spectra for spatially incoherent, polychromatic objects.
研究成果
The experimental results showed that 3D spatial information at every spectral component of the measured object was acquired properly by this method. A paraxial IRF defined over the space–frequency domain was derived, and the imaging properties of multispectral incoherent holography were investigated. The measurement time of the present method is considerably smaller than those of previous methods, making it useful in a wide range of applications.
研究不足
The spectral resolution is limited by the step interval and number of steps of the PZT. The method may have a long measurement time compared with previous methods, although it is considerably smaller than those of our previous methods.
1：Experimental Design and Method Selection:
The method is based on measuring differential wavefront curvature and applying Fourier transform spectrometry. The system is similar to a Michelson interferometer but replaces one mirror with a concave mirror.
2：Sample Selection and Data Sources:
Two mask screens of the letter K and number 2 illuminated by incoherent light sources (a metal halide lamp and a blue LED) were used as measured objects.
3：List of Experimental Equipment and Materials:
Includes a beam splitter, concave mirror, plane mirror, image sensor, piezoelectric translator (PZT), and metal halide lamp (MHL) and blue LED as light sources.
4：Experimental Procedures and Operational Workflow:
The optical wave from the object is divided into two parts by the beam splitter, reflected by either a concave mirror or plane mirror, and superposed on the beam splitter again to create a 2D interference pattern recorded by the image sensor. The optical path difference is introduced by moving the PZT stepwise.
5：Data Analysis Methods:
The cross-spectral density function is retrieved from the volume interferogram, and the 3D image for each spectrum is reconstructed by applying the inverse propagation formula.
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