概括
一个新的基于Raman lidars的现场可编程门阵列 (FPGA) 的光子计数模块显著减少了死亡时间至1.13 ns. 这一进步提高了数据的线性性和准确性,消除了复杂的死亡时间校准程序的需要.
科学领域:
- 大气物理学和遥感技术
- 仪器仪表和测量科学 仪器仪表和测量科学
背景情况:
- 光子计数增强了拉曼激光雷达数据采集系统 (DAQ) 的动态范围.
- 现有的光子计数模块存在很长的死亡时间,需要进行非线性校准,并引入错误.
研究的目的:
- 建议并实施基于Raman lidars的现场可编程门阵列 (FPGA) 的光子计数模块.
- 为了减少死亡时间,提高光子计数信号的线性和精度.
主要方法:
- 开发并实施基于FPGA的双通道光子计数模块.
- 使用了高速放大器/区分器对和优化的逻辑设计.
- 进行了观察性实验,以测量模块性能,并将其与商用短暂记录器进行比较.
主要成果:
- FPGA模块的总体死亡时间为1.13 ns,比商业Licel短暂记录器的4.35 ns显著改进.
- 低死亡时间确保信号线性,即使在高计数速度.
- 消除了对死亡时间校准的要求,减少了信号集成和检索结果的不确定性.
结论:
- 基于FPGA的光子计数模块为拉曼激光器提供了卓越的性能.
- 这种硬件升级导致更精确的回散测量和数据采集.
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相关概念视频
01:26Raman Spectroscopy Instrumentation: Overview
340
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
340
01:20Raman Spectroscopy: Overview
381
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
381