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Updated: Jun 25, 2026

Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident

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[Development of multi-target multi-spectral high-speed pyrometer].

Peng Xiao¹, Jing-Min Dai, Qing-Wei Wang

¹Department of Automation Measurement and Control, Harbin Institute of Technology, Harbin 150001, China. rocshore@hit.edu.cn

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu

|March 11, 2009

Summary

A new multi-target, multi-spectral pyrometer accurately measures solid propellant rocket engine (SPRE) plume temperature distribution. This high-speed instrument utilizes a dispersing prism and photodiodes for precise, simultaneous temperature and emissivity readings.

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Area of Science:

Aerospace Engineering
Combustion Science
Optical Measurement

Context:

Accurate measurement of solid propellant rocket engine (SPRE) plume temperature is crucial for understanding combustion status.
Previous multi-spectral thermometry techniques have been employed for SPRE plume temperature analysis.
The development of advanced pyrometers is essential for detailed SPRE performance evaluation.

Purpose:

To develop and present a novel multi-target, multi-spectral, high-speed pyrometer for SPRE plume temperature measurement.
To enable simultaneous measurement of temperature and emissivity across multiple points and spectra.
To enhance the precision and speed of SPRE plume temperature distribution analysis.

Summary:

A new multi-target, multi-spectral, high-speed pyrometer was developed for SPRE ground experiments.
The instrument features a dispersing prism and photodiode array (0.4-1.1 µm) with fiber optics for radiation collection.
It simultaneously measures temperature and emissivity for six points across eight spectra, with a Sample/Hold circuit ensuring <10ns signal timing.

Impact:

Provides a significant advancement in SPRE plume diagnostics.
Enables more accurate and detailed analysis of combustion processes in rocket engines.
Facilitates improved SPRE design and performance optimization through precise thermal measurements.