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IR Spectrometers

IR Spectrometers

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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Updated: Jun 10, 2025

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Published on: October 11, 2016

使用与反射光束扩展器配置的第二波分散干扰仪进行密度特征成像.

F J Wessel, C T Chavez, A Egly

The Review of scientific instruments

|October 17, 2024

概括

一种新的二分散干扰仪 (SHDI) 使用更大的探针束 (高达35mm) 来测量等离子体密度. 反射束扩展器通过最大限度地降低背景相位噪声来显著提高精度.

科学领域:

血物理学的等离子体物理学
光学诊断仪器的使用.
干涉测量是干涉测量的方法.

背景情况:

传统的二分散干扰计 (SHDI) 受到小探针束直径 (通常<1mm) 的限制.
测量脉冲等离子喷射的二维 (2D) 密度配置文件需要先进的诊断技术.
缩放诊断工具对于描述更大或更快的等离子体现象至关重要.

研究的目的:

开发和演示一种SHDI系统,能够使用显著更大的探针束直径测量脉冲等离子喷射的2D线路集成密度配置文件.
评估不同类型的光束扩展器 (无色与反射) 的性能,以提高SHDI的测量能力.
通过在各种操作参数下分析其密度配置文件,绘制脉冲等离子枪的性能图.

主要方法:

组装第二波分散干扰仪 (SHDI) 探针光束直径扩展到35mm,使用非色光束扩展器 (ABE) 或反射光束扩展器 (RBE).
在ABE和RBE配置之间比较相位图像质量和背景噪声水平.
通过在恒定放电电流下改变等离子枪定时参数 (气打开时间,气体注射延迟) 来描述直径为3cm × 5cm的脉冲等离子喷射.

主要成果:

使用带有RBE的35mm直径探针束实现了脉冲等离子喷射的2D (r,z) 密度配置测量.
确定ABE引入显著的周期性背景相噪声 (Δφ ∼ 2π半径),而RBE对背景相影响最小 (Δφbg ∼ 0.025半径).

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相关实验视频

Last Updated: Jun 10, 2025

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Published on: October 11, 2016

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis

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Published on: September 22, 2017

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

Published on: December 22, 2015

在等离子喷射中测量了Nedl 3 × 10^15 cm^-2 的名义直线集成电子密度和Ne 9 × 10^15 cm^-3 的体积密度.

结论:

反射光束扩展器 (RBE) 在大直径SHDI应用中优于非色光束扩展器 (ABE),原因是背景相引入最小.
2D-SHDI平台,特别是RBE,可扩展到更大的样本区域和潜在的重新评级系统.
增强的SHDI提供可重现的,时间分辨率 (~1 ns) 和高分辨率 (~100μm) 的2D等离子体密度配置文件测量,从而推进等离子体诊断.