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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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Related Experiment Video

Updated: Jul 6, 2026

Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor (IRIS)

Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor (IRIS)

Published on: May 3, 2011

Object detection with a field-portable spectropolarimetric imager.

N Gupta¹, L J Denes, M Gottlieb

¹U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783-1197, USA.

|March 28, 2008

Summary

A new spectropolarimetric imager effectively detects objects using spectral and polarization data. This compact, programmable system offers versatile applications in various environments.

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Applying Hyperspectral Reflectance Imaging to Investigate the Palettes and the Techniques of Painters

Applying Hyperspectral Reflectance Imaging to Investigate the Palettes and the Techniques of Painters

Published on: June 18, 2021

Related Experiment Videos

Last Updated: Jul 6, 2026

Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor (IRIS)

Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor (IRIS)

Published on: May 3, 2011

Applying Hyperspectral Reflectance Imaging to Investigate the Palettes and the Techniques of Painters

Applying Hyperspectral Reflectance Imaging to Investigate the Palettes and the Techniques of Painters

Published on: June 18, 2021

Area of Science:

Optics and Photonics
Remote Sensing
Instrumentation

Background:

Spectropolarimetric imaging combines spectral and polarization information for enhanced object characterization.
Traditional imaging systems may lack the sensitivity or spectral range for certain detection tasks.
Development of compact and programmable imagers is crucial for field deployable remote sensing applications.

Purpose of the Study:

To evaluate the performance of a novel spectropolarimetric imager for object detection.
To assess the system's capability in collecting spectral and polarization data across a wide range.
To analyze the collected data for its effectiveness in distinguishing objects from backgrounds.

Main Methods:

Utilized a compact, programmable spectropolarimetric imager incorporating a tellurium dioxide (TeO2) acousto-optic tunable filter and a liquid-crystal retardation plate.
Acquired spectral images in the 450-1000 nm range at 10- or 20-nm intervals.
Collected data at two or four polarization settings for each spectral interval, both in laboratory and field tests.

Main Results:

The spectropolarimetric imager successfully collected comprehensive spectral and polarization data.
Preliminary analysis indicated the system's potential for effective object detection.
Measurements demonstrated the system's functionality across diverse objects and backgrounds.

Conclusions:

The developed spectropolarimetric imager is a promising tool for object detection.
The system's compact and programmable nature facilitates its use in various scenarios.
Further analysis of the collected data will refine object detection algorithms and capabilities.