Rapid inversion of combustion temperature based on background radiation subtraction and logarithmic amplification in TDLAS

LI Yuhan; HU Jiayi; YAO Lu; XU Zhenyu; HUANG An; KAN Ruifeng

doi:10.37188/OPE.20263415.2302

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Rapid inversion of combustion temperature based on background radiation subtraction and logarithmic amplification in TDLAS

Laser Spectroscopy Technology and Instrumentation | 更新时间：2026-08-20

- Rapid inversion of combustion temperature based on background radiation subtraction and logarithmic amplification in TDLAS
- Optics and Precision Engineering Vol. 34, Issue 15, Pages: 2302-2316(2026)
- 作者机构：
  
  1.中国科学技术大学研究生院科学岛分院，安徽合肥 230026
  2.中国科学院合肥物质科学研究院，安徽合肥 230031
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20263415.2302
  CLC： O433.1;TN247
- CSTR：32169.14.OPE.20263415.2302
- Received：04 March 2026，
  
  Revised：2026-04-03，
  
  Online First：14 August 2026，
  
  Published：10 August 2026
- 稿件说明：
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李玉涵,胡佳屹,姚路等.基于辐射本底扣除和对数放大的TDLAS燃烧温度快速反演[J].光学精密工程,2026,34(15):2302-2316.

LI Yuhan,HU Jiayi,YAO Lu,et al.Rapid inversion of combustion temperature based on background radiation subtraction and logarithmic amplification in TDLAS[J].Optics and Precision Engineering,2026,34(15):2302-2316.
李玉涵,胡佳屹,姚路等.基于辐射本底扣除和对数放大的TDLAS燃烧温度快速反演[J].光学精密工程,2026,34(15):2302-2316. DOI： 10.37188/OPE.20263415.2302. CSTR： 32169.14.OPE.20263415.2302.

LI Yuhan,HU Jiayi,YAO Lu,et al.Rapid inversion of combustion temperature based on background radiation subtraction and logarithmic amplification in TDLAS[J].Optics and Precision Engineering,2026,34(15):2302-2316. DOI： 10.37188/OPE.20263415.2302. CSTR： 32169.14.OPE.20263415.2302.

摘要

针对传统可调谐半导体激光吸收光谱（Tunable Diode Laser Absorption Spectroscopy， TDLAS）系统因复杂谱线拟合与数值反演算法导致处理速度难以满足发动机毫秒级瞬态燃烧测量需求的问题，提出并研制了一种基于对数放大的快速硬件光谱处理系统，并围绕系统总体方案设计、背景辐射自动扣除电路设计、对数放大电路设计、算法修正以及实时数据处理架构等方面展开研究。该系统在模拟前端引入自主设计的背景辐射自动扣除电路和基于LOG114芯片的对数比放大电路，直接输出与吸光度成正比的电压信号；数字部分采用现场可编程门阵列（Field Programmable Gate Array， FPGA）完成高速数据采集与吸光度积分累加，再由微控制器实现温度反演。实验结果表明，在100 kHz扫描频率下，系统可实现背景辐射稳定扣除，单次温度计算时间约为2.5 ms。该系统可实现毫秒级的高温流场快速测量，具备捕捉发动机瞬态燃烧变化的潜力。

Abstract

To address the limitation that traditional TDLAS systems fail to meet the millisecond-scale transient combustion measurement requirements of engines because of processing delays introduced by complex spectral line fitting and numerical inversion algorithms， a rapid hardware-based spectral processing system using logarithmic amplification is proposed and developed. The study covers the overall system architecture， the design of an automatic background radiation subtraction circuit， the logarithmic amplification circuit， algorithmic correction methods， and the real-time data processing framework. In the analog front end， a proprietary background radiation subtraction circuit and a logarithmic ratio amplifier based on the LOG114 chip are employed to directly output a voltage signal proportional to absorbance. In the digital section， a field-programmable gate array （FPGA） is used for high-speed data acquisition and absorbance integration accumulation， followed by temperature inversion calculations implemented on a microcontroller. Experimental results show that， at a scanning frequency of 100 kHz， stable background radiation subtraction is achieved， and a single temperature calculation requires approximately 2.5 ms. The system is therefore capable of rapidly measuring high-temperature flow fields at millisecond intervals and is expected to capture transient combustion variations in engines.

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references

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