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Related Concept Videos

IR Spectrometers01:25

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...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...

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Updated: Jun 12, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Published on: December 5, 2025

Reflectometer design using nonimaging optics.

K A Snail

    Applied Optics
    |June 5, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel two-stage reflectometer design improves directional hemispherical reflectance measurements by using a compound parabolic concentrator (CPC) secondary mirror to eliminate detector response variations. This innovation ensures high, isotropic throughput for accurate optical property analysis.

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    Published on: August 12, 2013

    Area of Science:

    • Optical Engineering
    • Materials Science
    • Spectroscopy

    Background:

    • Accurate measurement of directional hemispherical reflectance is crucial for characterizing material optical properties.
    • Existing reflectometer designs can suffer from detector response variations, impacting measurement accuracy.
    • Fresnel variations in detector response can complicate the analysis of reflected light.

    Purpose of the Study:

    • To propose and analyze a new two-stage reflectometer design for enhanced directional hemispherical reflectance measurements.
    • To mitigate detector response variations using a specialized secondary mirror.
    • To evaluate the optical performance and throughput of the proposed reflectometer configuration.

    Main Methods:

    • Development of a two-stage reflectometer concept incorporating a primary collecting mirror and a secondary mirror.
    • Utilizing an inverted nonimaging compound parabolic concentrator (CPC) as the secondary mirror.
    • Employing ray tracing simulations to assess the throughput and isotropy of a CPC/ellipsoid reflectometer.

    Main Results:

    • The proposed two-stage reflectometer effectively eliminates Fresnel variations in detector response.
    • Ray tracing analysis of a CPC/ellipsoid configuration demonstrates high and isotropic throughput.
    • The inverted CPC secondary mirror is identified as key to achieving uniform detector illumination.

    Conclusions:

    • The novel two-stage reflectometer design offers a significant improvement for directional hemispherical reflectance measurements.
    • The use of a compound parabolic concentrator (CPC) secondary mirror is a viable strategy for enhancing measurement accuracy and consistency.
    • Further exploration of different primary mirror configurations (hemisphere, dual paraboloid) is warranted for diverse applications.