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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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Single beam schlieren interferometer using a wollaston prism.

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This summary is machine-generated.

This study converted a standard schlieren system into an interferometer to visualize gas density changes. The new method accurately mapped complex gas dynamic flow fields, matching theoretical predictions.

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Area of Science:

Fluid dynamics
Optical physics
Interferometry

Background:

Schlieren systems are common for visualizing fluid density variations.
Interferometry offers quantitative phase information, useful for precise measurements.
Integrating these techniques can enhance flow field analysis.

Purpose of the Study:

To adapt a standard schlieren system into a single beam schlieren interferometer.
To establish a method for correlating fringe shifts to density changes.
To investigate complex gas dynamic flow fields using the developed interferometer.

Main Methods:

Modification of a single pass schlieren system by replacing the knife edge with a polarizer-Wollaston prism-analyzer combination.
Development of an analytical framework linking interferogram fringe shifts to test section density variations.
Application of the interferometer to study a complex gas dynamic flow field.

Main Results:

Successful conversion of the schlieren system into a functional interferometer.
Demonstration of the relationship between fringe shifts and density gradients.
Obtained interferograms of a complex gas dynamic flow field.
Validation of experimental results against theoretical predictions.

Conclusions:

The developed single beam schlieren interferometer is effective for quantitative flow visualization.
The system accurately measures density changes in gas dynamic flows.
This technique provides a valuable tool for validating fluid dynamics theories.