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Sensation01:21

Sensation

Sensory receptors are specialized neurons that respond to specific types of external stimuli, initiating the process known as sensation. This occurs when sensory input, such as light entering the eye, is detected by these receptors, causing chemical changes in the cells of the retina. These cells then convert the sensory stimulus into action potentials that are transmitted to the central nervous system, a process termed transduction.
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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 distances...

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Related Experiment Video

Updated: Jul 9, 2026

Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults
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Digitally-defined ultrathin transparent wireless sensor network for room-scale imperceptible ambient intelligence.

Yunxia Jin1,2, Mengxia Yu3, Dat T Nguyen1,3,4

  • 1Institute for Health Innovation and Technology, National University of Singapore, Singapore 117599, Singapore.

Npj Flexible Electronics
|December 6, 2024
PubMed
Summary

Researchers developed ultra-thin, transparent radio-frequency (RF) sensors for ambient sensing. These flexible sensors enable room-scale wireless tracking of human activities and physiological signals, advancing smart environments for health monitoring.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Wearable Technology

Background:

  • Ambient sensing requires unobtrusive, integrated sensors.
  • Existing radio-frequency (RF) sensors lack transparency and flexibility for seamless integration.
  • Achieving high transparency, flexibility, and conductivity simultaneously is a key challenge.

Purpose of the Study:

  • To develop ultra-thin, transparent, and flexible RF sensors for ambient sensing.
  • To enable room-scale wireless tracking of human activities and physiological signals.
  • To explore applications in health monitoring and elderly care.

Main Methods:

  • Fabrication of 4.5 μm thick RF tag sensors with >90% transparency.
  • Development of a laser-assisted water-based adhesion-reversion process for scalable RF design.
  • Demonstration of multiplexed wireless tracking of objects and human body regions.

Main Results:

  • Achieved RF sensors with >90% transparency and flexibility.
  • Enabled room-scale (up to 8 m) ambient wireless sensing capabilities.
  • Successfully demonstrated multiplexed tracking of human-environment interactions and physiological signals.

Conclusions:

  • The developed RF sensors offer a novel solution for non-intrusive, ambient sensing in daily living spaces.
  • These sensors have significant potential for applications in remote health monitoring and elderly care.
  • The technology paves the way for aesthetically integrated and functionally versatile smart environments.