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Summary

This summary is machine-generated.

An adaptive digital filter bridges the spatial and time domains, enabling the use of audio analog-to-digital converters for interferometric spectrometry. This innovation simplifies complex systems by moving functions from hardware to software.

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Area of Science:

Spectrometry
Signal Processing
Instrumentation

Background:

Laser fringes are standard for the x-axis in interferometric spectrometry.
Intensity axis solutions in interferometry are historically less satisfactory.
Commercial development of low-cost, high-precision sigma-delta analog-to-digital converters (ADCs) for audio applications is rapid.

Purpose of the Study:

To bridge the spatial domain of laser interferometry with the time domain operation of ADCs.
To enable the use of readily available, cost-effective audio ADCs in interferometric systems.
To simplify interferometric control and data acquisition by shifting complexity to software.

Main Methods:

Development of an adaptive digital filter to interface spatial and temporal domains.
Utilizing sigma-delta ADCs (20-bit precision, 50 kHz) for data acquisition.
Implementing algorithms for flexible fringe subdivision and drive velocity compensation in software.

Main Results:

The adaptive digital filter successfully enables ADC use for measurements at arbitrary times.
Software-based fringe subdivision increases the free spectral range without "laser ghosts."
Drive velocity variation compensation is achievable with modest memory increase.

Conclusions:

The adaptive digital filter provides a novel solution for the intensity axis in interferometric spectrometry.
This approach significantly reduces system cost and complexity by leveraging commercial audio ADCs.
Shifting control and data acquisition to software enhances system flexibility and performance.