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UV–Vis Spectrometers

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...

Instrument Calibration

Instrument Calibration

Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for electronic transitions. As a result...

Calibration Curves: Linear Least Squares

Calibration Curves: Linear Least Squares

A calibration curve is a plot of the instrument's response against a series of known concentrations of a substance. This curve is used to set the instrument response levels, using the substance and its concentrations as standards. Alternatively, or additionally, an equation is fitted to the calibration curve plot and subsequently used to calculate the unknown concentrations of other samples reliably.
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UV–Vis Spectroscopy: Beer–Lambert Law

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The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...

IR Spectrometers

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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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An Intra-Tissue Radiometry Microprobe for Measuring Radiance In Situ in Living Tissue

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In situ calibration technique for UV spectral radiometers.

S R Wilson, B W Forgan

|November 10, 2010

Summary

A new method calibrates spectral radiometers using top-of-atmosphere solar irradiance. This technique also measures radiometer angular response and estimates ozone column amounts for ultraviolet-B measurements.

Area of Science:

Radiometry
Atmospheric Science
Solar Physics

Background:

Accurate spectral radiometer calibration is crucial for reliable solar irradiance measurements.
Existing calibration methods may not fully capture instrument angular response or provide atmospheric insights.

Purpose of the Study:

To report a novel technique for calibrating spectral radiometers.
To establish solar irradiance at the top of the atmosphere as an absolute reference standard.
To incorporate direct measurement of radiometer angular response and ozone column estimation.

Main Methods:

Utilized solar irradiance at the top of the atmosphere as the absolute irradiance reference.
Developed a calibration technique applicable to global (2π steradian) irradiance measurements.

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Integrated measurement of the radiometer's angular response within the calibration process.

Main Results:

Successfully calibrated spectral radiometers across all measured wavelengths.
Obtained a direct measure of the radiometer's angular response.
Provided an estimate of the ozone column amount for instruments measuring the ultraviolet-B region.

Conclusions:

The reported technique offers a comprehensive calibration for spectral radiometers.
It enhances measurement accuracy by including angular response and atmospheric parameters like ozone.
This method provides a robust approach for solar and atmospheric research.