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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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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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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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Single-Ended Eddy Current Micro-Displacement Sensor with High Precision Based on Temperature Compensation.

Zhengping Xu1, Yongtong Feng1,2, Yi Liu1,2

  • 1Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China.

Micromachines
|March 28, 2024
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Summary

This study presents a temperature-compensated eddy current sensor for precise micro-displacement measurement. The developed sensor achieves high resolution and significantly reduces voltage fluctuations caused by temperature changes.

Keywords:
digital phase discriminatoreddy current sensormicro-displacementtemperature compensation

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Area of Science:

  • Instrumentation and Measurement
  • Sensor Technology
  • Materials Science

Background:

  • Reliable micro-displacement measurement requires high precision sensors.
  • Eddy current sensors offer non-contact measurement capabilities.
  • Temperature variations can significantly impact sensor accuracy.

Purpose of the Study:

  • To develop and evaluate a single-ended eddy current sensor with integrated temperature compensation.
  • To analyze the sensor's performance in terms of resolution, repeatability, and temperature stability.
  • To demonstrate the feasibility of the proposed design for precise micro-displacement applications.

Main Methods:

  • Detailed study of eddy current sensor principles and probe manufacturing.
  • Design of a processing circuit converting output signal variations to digital pulses.
  • Implementation of a digital phase discriminator, low-pass filter, and amplification stage.
  • Development of a temperature-compensating circuit using a digital potentiometer and embedded temperature sensor.

Main Results:

  • The sensor exhibits nonlinearity at large measurement ranges.
  • Achieved a resolution of 46 nm for a 500 μm range with ±0.70% FR repeatability error.
  • Temperature compensation reduced voltage fluctuation from 586 mV to 44 mV across a +2 °C to +58 °C range.

Conclusions:

  • The developed temperature-compensated eddy current sensor is feasible for high-precision micro-displacement measurement.
  • The sensor demonstrates improved accuracy and stability under varying temperature conditions.
  • Consideration of measurement range, precision, and target material is crucial for practical implementation.