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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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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

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Colorimetric Thermography by a Long-Infrared Dual-Band Metalens.

Zhendong Luo^1,2, Peng Zhang¹, Huwang Hou³

¹CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Instrumentation, University of Science and Technology of China, Hefei, 230026, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|November 19, 2024

Summary

A novel dual-band metalens enables compact infrared colorimetric thermography, overcoming emissivity variations for accurate temperature measurements of low-emissivity objects. This innovation enhances IR thermography applications in complex environments.

Keywords:

colorimetric thermography dual‐band metalens emissivity infrared detection

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Last Updated: Jun 7, 2025

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Area of Science:

Optics and Photonics
Infrared Technology
Materials Science

Background:

Infrared (IR) thermography offers non-contact temperature measurement but is limited by object emissivity variations.
Traditional colorimetric thermography is emissivity-independent but requires bulky optical systems and complex configurations.

Purpose of the Study:

To develop a compact, lightweight, and customizable solution for IR colorimetric thermography.
To mitigate emissivity-induced measurement errors in IR thermography.

Main Methods:

Fabrication of a dual-band metalens operating at 9.5 and 12.5 µm.
Demonstration of dual-band IR imaging using the metalens.
Application of the metalens in colorimetric thermography for low-emissivity objects without emissivity pre-setting.

Main Results:

Successfully demonstrated dual-band IR imaging and colorimetric thermography with the fabricated metalens.
Achieved an average reduction of 50.16% in emissivity-related measurement errors for temperatures between 60-180 °C.
Validated the metalens' effectiveness in overcoming emissivity challenges.

Conclusions:

The developed dual-band metalens provides a compact and effective solution for emissivity-independent IR thermography.
This innovation enables dynamic and multi-target thermography in complex environments with reduced measurement errors.
Paves the way for advanced, miniaturized IR sensing systems.