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相关概念视频

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

197
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
197
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

970
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
970
Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

284
Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
284
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

586
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
586
Parallel Resonance01:23

Parallel Resonance

204
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
204

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相关实验视频

Updated: Jun 21, 2025

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
15:25

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

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一个双轴直角共振器用于可变灵敏度模式定位传感传感器.

Yuta Nagasaka1, Alessia Baronchelli2, Shuji Tanaka1

  • 1Department of Robotics, School of Engineering, Tohoku University, Sendai 980-8579, Japan.

Sensors (Basel, Switzerland)
|July 13, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的模式定位传感方法,使用单个可调的共振器. 研究人员通过精确控制共振器,使灵敏度提高了十倍.

关键词:
在MEMS共振器共振器中.模式本地化 模式本地化灵敏度调整 调整灵敏度调整

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Label-free Single Molecule Detection Using Microtoroid Optical Resonators
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Fabrication and Testing of Microfluidic Optomechanical Oscillators
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Fabrication and Testing of Microfluidic Optomechanical Oscillators

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相关实验视频

Last Updated: Jun 21, 2025

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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Label-free Single Molecule Detection Using Microtoroid Optical Resonators
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Label-free Single Molecule Detection Using Microtoroid Optical Resonators

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科学领域:

  • 物理 物理学 物理
  • 机械工程 机械工程
  • 材料科学 材料科学 材料科学

背景情况:

  • 模式定位传感依赖于合的共振器来检测变化.
  • 传统的设计往往面临着在调度和紧性方面的局限性.
  • 精确控制模式间合对于提高传感器灵敏度至关重要.

研究的目的:

  • 为了展示一种模式本地化传感方法,使用单个,双轴直角共振器.
  • 为了证明静电调整异型刚度允许精确控制模式间合.
  • 通过优化合,实现显著提高传感器灵敏度.

主要方法:

  • 一个单双轴直角共振器的制造,具有同心的多环和圆弹.
  • 静电调整异型度以控制直角振荡模式之间的合度.
  • 开发一种分解重叠共振峰的方法,以准确测量模式幅度比.

主要成果:

  • 证明了对合刚度的精确控制,包括接近零和正负两种值.
  • 在模式定位感应灵敏度中实现了数量级的增强.
  • 验证了对紧,可调节传感器的简化共振器设计的有效性.

结论:

  • 单个可调节的共振器为传统的合共振器传感器提供了一种简化且有利的替代方案.
  • 静电调为实现可变灵敏度模式定位设备提供了一种多功能方法.
  • 开发的方法可以通过调整接近零的合刚度来实现高度敏感的检测.