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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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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

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Infrared/microwave (IR/MW) micromirror array beam combiner design and analysis.

Yi Tian¹, Lijun Lv, Liwei Jiang

¹School of Opto-Electronics, Beijing Institute of Technology, Beijing, China. ty.hit.edu@163.com

|August 6, 2013

Summary

This study presents a novel infrared (IR)/microwave (MW) micromirror array beam combiner. The design simplifies MW transmission and uses IR wavefront-division imaging, achieving less than 1° boresight error.

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Area of Science:

Optics and Photonics
Electromagnetics
Microwave Engineering

Background:

Micromirror arrays are crucial for beam combining in optical and microwave systems.
Integrating IR and MW functionalities presents design challenges due to differing wavelength interactions with micromirror dimensions.

Purpose of the Study:

To investigate the design methodology for an IR/MW micromirror array beam combiner.
To develop a simplified design for MW transmission using transmission line theory.
To analyze boresight error using advanced computational electromagnetics techniques.

Main Methods:

Transmission line theory for microwave multilayered substrate design.
Infrared wavefront-division imaging for IR reflection.
Method of Moments (MoM) and Multilevel Fast Multipole Method (MLFMM) for boresight error analysis.

Main Results:

Micromirror dimensions were optimized for selective IR reflection and MW transmission.
Boresight error introduced by the finite size of the beam combiner was determined to be less than 1°.
A prototype micromirror array was fabricated and tested, validating the IR wavefront-division imaging technique.

Conclusions:

The proposed design method successfully integrates IR and MW functionalities in a micromirror array beam combiner.
The wavefront-division imaging technique is effective for IR beam combining.
The computational analysis accurately predicted the boresight error, confirming the design's viability.