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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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Dosimetry for Cell Irradiation using Orthovoltage (40-300 kV) X-Ray Facilities

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Active cavity radiometer type IV.

|March 9, 2010

Summary

A new Active Cavity Radiometer type IV (ACR IV) precisely measures solar irradiance. This advanced pyrheliometer offers 0.1% uncertainty, crucial for detecting climate-significant solar variations.

Area of Science:

Solar physics
Radiometry
Climate science

Background:

Accurate measurement of total solar irradiance is vital for understanding Earth's energy balance.
Existing radiometers have limitations in precision and long-term stability.

Purpose of the Study:

To develop and validate a new cavity pyrheliometer, the Active Cavity Radiometer type IV (ACR IV).
To achieve high-precision measurements of total solar optical irradiance.
To contribute to long-term monitoring of solar output for climate change detection.

Main Methods:

Development of the Active Cavity Radiometer type IV (ACR IV) instrument.
Testing of a prototype ACR IV.
Flight testing of an ACR IV instrument on a sounding rocket to determine the solar constant.

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Development of ACR IV instrumentation for future Spacelab I and Solar Maximum missions.

Main Results:

The ACR IV is predicted to measure solar irradiance at the solar constant level with 0.1% uncertainty in SI units.
Comparison tests show ACR IV consistently measured 0.3% higher than the World Radiometric Reference scale.
A prototype was successfully tested, and a flight instrument was deployed in a sounding rocket experiment.

Conclusions:

The ACR IV represents a significant advancement in solar irradiance measurement technology.
The instrument's high precision and planned space missions will enable long-term monitoring of solar output.
This monitoring is essential for detecting solar variations with climatological significance.