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相关概念视频

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

63
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
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Temperature Measurement Sites01:14

Temperature Measurement Sites

1.8K
A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
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Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

1.1K
Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
1.1K
Distance Corrections01:15

Distance Corrections

51
To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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Thermometers and Temperature Scales01:22

Thermometers and Temperature Scales

5.6K
Any physical property that depends consistently and reproducibly on temperature can be used as the basis of a thermometer. For example, volume increases with temperature for most substances. This property is the basis for the common alcohol thermometer and the original mercury thermometers. Other properties used to measure temperature include electrical resistance, color, and the emission of infrared radiation.
As many physical properties depend on temperature, the variety of thermometers is...
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Eddy Currents01:25

Eddy Currents

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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
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相关实验视频

Updated: Jul 23, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

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广的温度范围和低温漂流流流位移传感器使用数字关联调节.

Tianxiang Ma1,2, Yuting Han2,3, Yongsen Xu2

  • 1Information and Communication Engineering, School of Electronic and Information Engineering, Changchun University of Science and Technology, Changchun 130022, China.

Sensors (Basel, Switzerland)
|July 11, 2023
PubMed
概括

一个新的微分数字解调旋流传感器系统显著降低了温度漂移. 这项创新提高了在可变温度环境中无接触测量的精度.

关键词:
数字化解调节是指数字化解调节.双重相关性解调解解调.厄迪电流传感器传感器温度漂移 温度漂移 温度漂移

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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Method for Simultaneous fMRI/EEG Data Collection during a Focused Attention Suggestion for Differential Thermal Sensation
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Method for Simultaneous fMRI/EEG Data Collection during a Focused Attention Suggestion for Differential Thermal Sensation

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相关实验视频

Last Updated: Jul 23, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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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:

  • * 仪器仪表与测量科学 * 仪表仪表与测量科学
  • * 传感器技术 * 传感器技术
  • * * 信号处理 信号处理

背景情况:

  • *传统的旋流传感器为微位移和旋转速度传感等应用提供无接触测量,高带宽和灵敏度.
  • * 传统的旋流传感器的一个主要局限性是它们易受温度偏移的影响,这会影响测量准确度.
  • *克服温度引起的不准确性对于在各种环境条件下可靠的传感器性能至关重要.

研究的目的:

  • * 设计和评估一个微分数字解调流传感器系统.
  • *为了减轻温度漂移对传感器输出准确度的影响.
  • * 为了实现高精度和灵活性,用于具有显著温度变化的应用程序的流传感.

主要方法:

  • * 实现差分传感器探测器以取消常态温度干扰.
  • *使用高速模拟数字转换器 (ADC) 数字化微分模拟载波信号.
  • *通过双相关解调方法在现场可编程门数组 (FPGA) 中提取振幅信息.

主要成果:

  • *开发的传感器在±2.5毫米范围内显示了0.68%的非线性.
  • * 实现了760nm的高分辨率和25kHz的最大带宽.
  • * 与传统的模拟解调技术相比,显著抑制了温度漂移.

结论:

  • *差分数位解调旋流传感器系统提供高精度和低温漂移.
  • * 传感器的设计为经历大温度波动的应用提供了增强的灵活性.
  • * 这种先进的传感器系统可以在具有挑战性的温度变化的环境中有效地取代传统传感器.