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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

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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

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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

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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,...
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Distance Corrections01:15

Distance Corrections

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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

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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.
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Related Experiment Video

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

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Wide Temperature Range and Low Temperature Drift Eddy Current Displacement Sensor Using Digital Correlation

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
Summary
This summary is machine-generated.

A new differential digital demodulation eddy current sensor system significantly reduces temperature drift. This innovation enhances accuracy for contactless measurements in variable temperature environments.

Keywords:
digital demodulationdouble correlation demodulationeddy current sensortemperature drift

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Area of Science:

  • * Instrumentation and Measurement Science
  • * Sensor Technology
  • * Signal Processing

Background:

  • * Conventional eddy-current sensors offer contactless measurement, high bandwidth, and sensitivity for applications like micro-displacement and rotational speed sensing.
  • * A key limitation of traditional eddy-current sensors is their susceptibility to temperature drift, impacting measurement accuracy.
  • * Overcoming temperature-induced inaccuracies is crucial for reliable sensor performance in diverse environmental conditions.

Purpose of the Study:

  • * To design and evaluate a differential digital demodulation eddy current sensor system.
  • * To mitigate the impact of temperature drift on sensor output accuracy.
  • * To achieve high precision and flexibility in eddy current sensing for applications with significant temperature variations.

Main Methods:

  • * Implementation of a differential sensor probe to cancel common-mode temperature interference.
  • * Digitization of differential analog carrier signals using a high-speed Analog-to-Digital Converter (ADC).
  • * Amplitude information extraction via a double correlation demodulation method within a Field-Programmable Gate Array (FPGA).

Main Results:

  • * The developed sensor demonstrated a nonlinearity of 0.68% within the ±2.5 mm range.
  • * Achieved a high resolution of 760 nm and a maximum bandwidth of 25 kHz.
  • * Exhibited significant suppression of temperature drift compared to conventional analog demodulation techniques.

Conclusions:

  • * The differential digital demodulation eddy current sensor system offers high precision and low temperature drift.
  • * The sensor's design provides enhanced flexibility for applications experiencing large temperature fluctuations.
  • * This advanced sensor system can effectively replace conventional sensors in challenging, temperature-variable environments.