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相关概念视频

Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

2.0K
An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
2.0K
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

1.5K
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
1.5K
Atomic Force Microscopy01:08

Atomic Force Microscopy

4.6K
Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
4.6K
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

1.5K
Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
1.5K
Galvanometer01:24

Galvanometer

3.4K
Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of  two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform...
3.4K
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

1.1K
Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
1.1K

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相关实验视频

Updated: Mar 15, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
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Gradient Echo Quantum Memory in Warm Atomic Vapor

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一个单细胞光学的内在光度计.

Nicholaus Zilinski1, Ash M Parameswaran1, Bonnie L Gray1

  • 1School of Engineering Science, Simon Fraser University, Burnaby, BC V5A 1S6, Canada.

Sensors (Basel, Switzerland)
|March 14, 2026
PubMed
概括
此摘要是机器生成的。

我们开发了一种新的单细胞光学磁计 (OPM) 梯度计,为检测生物磁场提供了低成本,不那么复杂的替代SQUID系统.

关键词:
生物磁传感传感器是一种生物磁传感器.常用模式的拒绝方式这是一个内在的梯度计.有光学的磁力计,具有光学的磁力计.

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Optical Recording of Suprathreshold Neural Activity with Single-cell and Single-spike Resolution
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相关实验视频

Last Updated: Mar 15, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

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Optical Recording of Suprathreshold Neural Activity with Single-cell and Single-spike Resolution
08:48

Optical Recording of Suprathreshold Neural Activity with Single-cell and Single-spike Resolution

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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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科学领域:

  • 生物物理学的生物物理.
  • 磁力学测量是一种磁力学测量.
  • 传感器技术 传感器技术

背景情况:

  • 超导量子干扰装置 (SQUID) 是生物磁场检测的标准,但需要冷冷却.
  • 光学磁计 (OPM) 提供了一个非低温的替代方案,使磁场传感更容易获得和潜在的便携式.

研究的目的:

  • 设计,建造和描述一个单细胞内在的OPM梯度计.
  • 为了证明使用这个OPM梯度计来检测生物磁信号的可行性,例如心脏活动.

主要方法:

  • 使用了带有直角和探针束的鲁比-87蒸汽电池.
  • 使用平衡极相仪测量两个传感区域的空间磁梯度.
  • 特性性能包括常态排斥比率和灵敏度,并通过心脏测量进行测试.

主要成果:

  • 在没有被动屏蔽的情况下,实现了常态排斥比>50dB和267 pT/cm/√Hz的灵敏度.
  • 成功记录了初步的心脏同步磁力测量.
  • 在信号处理后,表现出与心脏时间一致的心脏同步波形.

结论:

  • 单细胞OPM梯度计是传统梯度计的可行,具有成本效益和不那么复杂的替代方案.
  • 与多细胞系统相比,这种设计简化了校准,调制和屏蔽要求.
  • 证明的生物磁传感能力显示了未来在医学诊断中的应用的前景.