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Related Concept Videos

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...
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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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,...
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...
High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...

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Two-color optical charge-coupled-device-based pyrometer using a two-peak filter.

Tairan Fu1, Huan Zhao, Jun Zeng

  • 1Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, People's Republic of China. trfu@mail.tsinghua.edu.cn

The Review of Scientific Instruments
|January 5, 2011
PubMed
Summary
This summary is machine-generated.

A new charge-coupled-device (CCD)-based pyrometer improves temperature measurements using a multipeak interference filter. This enhanced optical pyrometry system offers greater sensitivity and a wider effective temperature range for industrial applications.

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Area of Science:

  • Optical Engineering
  • Temperature Measurement
  • Scientific Instrumentation

Background:

  • Traditional two-color pyrometry faces limitations with charge-coupled-device (CCD) sensors, restricting measurements to specific wavebands.
  • Existing CCD-based pyrometers have limitations in low-temperature detection limits and temperature sensitivity.
  • Accurate, wide-range temperature measurement is crucial in various industrial and scientific applications.

Purpose of the Study:

  • To develop and evaluate an improved two-color optical pyrometer utilizing a multipeak interference filter and a color CCD sensor.
  • To enhance temperature measurement accuracy, sensitivity, and effective range compared to previous systems.
  • To demonstrate the applicability of the new pyrometer for real-world temperature distribution measurements.

Main Methods:

  • A novel optical pyrometer was designed incorporating a multipeak interference filter with a color CCD sensor.
  • The system's spectrum response was adjusted to optimize temperature measurement capabilities.
  • Performance was evaluated using blackbody experiments with a two-peak filter (643 nm and 564 nm) and applied to measure stainless steel surface temperature.

Main Results:

  • The new system demonstrated a significant increase in low-temperature detection limit (approx. 200 K higher) and improved signal sensitivity.
  • An extended effective temperature range was achieved for measurements above 1233 K.
  • The ratio of color signals (C(R)/C(G)) showed monotonic behavior with temperature, simplifying measurements, and temperature sensitivity increased from 1.36 to 2.49.

Conclusions:

  • The developed CCD-based pyrometer with a multipeak interference filter significantly enhances measurement performance.
  • The system overcomes limitations of traditional color CCDs, offering improved sensitivity, range, and temperature sensitivity.
  • The pyrometer's successful application in measuring stainless steel surface temperature validates its practical utility and accuracy.