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IR Spectrometers

IR Spectrometers

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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Implementation of a Reference Interferometer for Nanodetection

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Grating interferometer with extremely high stability, suitable for measuring small refractive index changes.

T H Barnes, K Matsumoto, T Eiju

|June 29, 2010

Summary

This summary is machine-generated.

A highly stable grating interferometer, functioning as a differential refractometer, demonstrates exceptional precision. This advanced instrument utilizes heterodyne techniques for sensitive measurements, achieving long-term stability within 1/1500 of a wavelength over two hours.

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Area of Science:

Optics and Photonics
Metrology and Measurement Science

Background:

Interferometry is crucial for high-precision measurements.
Differential refractometry requires instruments with exceptional stability and sensitivity.

Purpose of the Study:

To develop and characterize a novel grating interferometer.
To assess its performance as a differential refractometer with high stability and sensitivity.

Main Methods:

Utilized a grating interferometer setup.
Employed heterodyne techniques for enhanced sensitivity.
Conducted long-term stability tests over a 2-hour period.

Main Results:

The grating interferometer demonstrated extremely high stability.
The system achieved a long-term stability of approximately 1/1500 of a wavelength over 2 hours.
The instrument proved effective as a differential refractometer.

Conclusions:

The developed grating interferometer offers a highly stable and sensitive platform for differential refractometry.
This instrument advances the capabilities for precise optical measurements.