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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...
Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
IR Spectrum01:19

IR Spectrum

When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...

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Related Experiment Video

Updated: Jun 16, 2026

In Situ Surface Temperature Measurement in a Conveyor Belt Furnace via Inline Infrared Thermography
07:03

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Published on: May 30, 2020

Thallium selenide infrared detector.

P S Nayar, W O Hamilton

    Applied Optics
    |February 23, 2010
    PubMed
    Summary

    This study details semiconducting thallium selenide for infrared (IR) detection. The material achieves high responsivity and low noise equivalent power (NEP) at cryogenic temperatures.

    Area of Science:

    • Solid-state physics
    • Materials science
    • Infrared technology

    Background:

    • Semiconducting materials are crucial for advanced optical detectors.
    • Thallium selenide (TlSe) exhibits unique electronic properties.
    • Efficient infrared (IR) detection is vital for various scientific and industrial applications.

    Purpose of the Study:

    • To investigate the potential of semiconducting thallium selenide for infrared (IR) detection.
    • To characterize the performance metrics of TlSe-based IR detectors.
    • To establish optimal operating conditions for enhanced detector performance.

    Main Methods:

    • Fabrication and testing of thallium selenide-based detector devices.
    • Measurement of detector responsivity at cryogenic temperatures.

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  • Evaluation of noise equivalent power (NEP) and response time.

    • Main Results:

    • Demonstrated high responsivity of 10^6 V/W for TlSe detectors.
    • Achieved a noise equivalent power (NEP) of approximately 10^-15 W/√Hz.
    • Observed a rapid response time of 3 milliseconds at 1.5 K.

    Conclusions:

    • Semiconducting thallium selenide is a promising material for high-performance IR detection.
    • Cryogenic operation significantly enhances the sensitivity and speed of TlSe detectors.
    • The achieved parameters suggest TlSe detectors are suitable for demanding IR sensing applications.