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Signal-to-noise ratio calculation in a moving-optical-wedge spectrometer.

Tarek A Al-Saeed¹, Diaa A Khalil

¹Biomedical Engineering Department, Faculty of Engineering, Helwan University, Helwan, Egypt. tarek1971@ieee.org

|October 24, 2012

Summary

This study compares optical spectrometer performance in wedge and Michelson interferometers. Wedge interferometers are less affected by linear vibration but more by rotational vibration.

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Area of Science:

Optical Engineering
Spectroscopy
Interferometry

Background:

Interferometers are crucial for spectroscopy, but their signal-to-noise ratio (SNR) can be degraded by environmental factors.
Conventional Michelson interferometers are widely used but susceptible to various noise sources.
Optical-wedge interferometers offer an alternative design for spectroscopic applications.

Purpose of the Study:

To investigate and quantify the signal-to-noise ratio (SNR) degradation in a moving-optical-wedge interferometer when employed as an optical spectrometer.
To analyze the impact of mechanical vibration and temperature fluctuations on the wedge interferometer's performance.
To compare the environmental sensitivities of the wedge interferometer against a conventional Michelson interferometer.

Main Methods:

The study involved analyzing the SNR degradation in a moving-optical-wedge interferometer configured as a spectrometer.
Mechanical vibration (linear and rotational) and temperature fluctuation effects were systematically investigated.
Performance metrics of the wedge interferometer were directly compared with those of a standard Michelson interferometer under identical conditions.

Main Results:

The optical-wedge interferometer demonstrated greater immunity to linear translational vibrations compared to the Michelson interferometer.
Conversely, the wedge interferometer exhibited significantly higher sensitivity to rotational vibrations.
Temperature fluctuations were also assessed, with comparative data presented for both interferometer types.

Conclusions:

The moving-optical-wedge interferometer presents a viable alternative for optical spectrometry, offering specific advantages in vibration immunity.
Understanding the differential sensitivity to rotational vibration is critical for optimizing its application and design.
Further research can focus on mitigating rotational vibration effects to enhance the overall robustness of wedge interferometers in spectroscopic systems.