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IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Updated: Jun 20, 2026

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Published on: February 8, 2014

Hologram interferometry without a reference beam.

¹National Measurement Laboratory, CSIRO, Sydney, Australia 2070.

|August 18, 2009

Summary

This summary is machine-generated.

Real-time interference fringes were observed in holographic setups using diffusely reflecting objects. This phenomenon occurs even without the reference beam, supporting linear theory for stable objects.

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Area of Science:

Optical Physics
Holography
Interferometry

Background:

Holography typically requires a reference beam for image reconstruction.
Interference fringes are fundamental to holographic imaging and interferometry.
The observation of fringes without a reference beam presents a novel scenario.

Purpose of the Study:

To investigate the real-time observation of interference fringes in a holographic setup.
To determine the conditions under which fringes can be viewed without a reference beam.
To validate theoretical models for fringe formation in unconventional holographic conditions.

Main Methods:

Utilized a holographic setup with a diffusely reflecting object.
Exposed and viewed the photographic plate with the reference beam intentionally blanked off.
Analyzed the observed interference fringes using linear theory.

Main Results:

Successfully observed real-time interference fringes under the specified conditions.
Confirmed that fringes are visible even when the reference beam is absent during viewing.
Found that linear theory accurately predicts fringe formation when the object remains largely unchanged.

Conclusions:

Real-time interference fringe observation is achievable in specific holographic configurations without a reference beam.
The stability of the object is a critical factor for fringe visibility in this setup.
The findings support the applicability of linear theory beyond conventional holographic reconstruction methods.