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Related Concept Videos

Thermal Strain01:19

Thermal Strain

2.3K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
2.3K
Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

1.3K
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in...
1.3K
Measurements of Strain01:27

Measurements of Strain

2.1K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.1K
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

522
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
522
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

191
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
191
Thermosensation01:43

Thermosensation

31.8K
Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
31.8K

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Related Experiment Video

Updated: Sep 9, 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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Intrinsically Temperature-Insensitive and Highly Sensitive Flexible Wireless Strain Sensor.

Zekai Huang1, Guirong Wu1,2, Yunyi Hu3

  • 1Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361102, China.

ACS Sensors
|September 3, 2025
PubMed
Summary
This summary is machine-generated.

This study presents a novel flexible strain sensor that is insensitive to temperature changes, offering high sensitivity and wireless capabilities. This breakthrough addresses key challenges in monitoring strain in demanding environments.

Keywords:
NFCflexible sensorhigh sensitivityion-electrontemperature-insensitive

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Area of Science:

  • Flexible electronics
  • Sensor technology
  • Materials science

Background:

  • Strain monitoring in dynamic environments (e.g., solid rocket propellants, batteries, human ligaments) is challenging due to coexisting mechanical deformation and temperature fluctuations.
  • Conventional strain sensors exhibit significant thermal drift, limiting their reliability in wireless and implantable applications.

Purpose of the Study:

  • To develop an intrinsically temperature-insensitive, highly sensitive, wireless flexible strain sensor.
  • To overcome the limitations of conventional sensors in environments with fluctuating temperatures.

Main Methods:

  • Designed a flexible strain sensor combining two engineered materials with opposing temperature coefficients of resistance.
  • Utilized near-field communication technology for passive wireless functionality.
  • Achieved self-compensated thermal stability through material engineering.

Main Results:

  • The sensor demonstrates minimal temperature drift (160 × 10-6 °C-1), eliminating the need for external calibration.
  • Achieved a high gauge factor of 2415.76 across a wide strain range (0-80%).
  • Enabled wireless, battery-free strain readout over a distance of 3 cm.

Conclusions:

  • The developed sensor offers a generalizable strategy for achieving thermal invariance in high-performance flexible strain sensors.
  • Expands the utility of passive wireless sensing in harsh and dynamic environments.
  • Proven robust performance in solid rocket motor propellant monitoring, lithium-ion battery deformation detection, and human knee joint ligament strain sensing.