Related Experiment Video
Updated: Jan 25, 2026
08:23
A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
6.7K
Multimode-interference-effect-based all-fiber displacement sensing system for an orthopedic Ilizarov apparatus device
Applied Optics
|May 3, 2019
Summary
This study presents a novel fiber optic sensor for precise, wide-range displacement monitoring in orthopedic external fixation. The system accurately measures bone displacement in real-time, crucial for effective fracture healing.
Area of Science:
- Biomedical Engineering
- Optical Sensing
- Materials Science
Background:
- Orthopedic external fixation devices, like the Ilizarov apparatus, require accurate monitoring of bone displacement for optimal healing.
- Existing monitoring methods may lack the precision, real-time capability, or wide-range measurement needed for complex orthopedic applications.
Purpose of the Study:
- To develop and validate a novel single-mode-multimode-single-mode (SMS) fiber optic sensing system for wide-range displacement monitoring.
- To integrate this sensor with an Ilizarov external fixation device for real-time clinical application.
- To characterize the sensor's performance, including its measurement range, sensitivity, and resolution, while accounting for temperature variations.
Main Methods:
- Utilized a multimode interference (MMI) effect within a single-mode-multimode-single-mode (SMS) fiber optic structure.
- Implemented displacement measurement through the uniform extension of a spring connected to the SMS fiber sensor.
- Employed a macrobending-fiber-based interrogation system to measure and compensate for temperature perturbations.
- Measured transmission spectra to determine displacement and temperature effects.
Main Results:
- Achieved a wide displacement measurement range of 110 mm.
- Demonstrated a maximum sensitivity of -53 pm/mm for displacement measurement.
- Obtained a displacement resolution of 500 μm.
- Successfully compensated for temperature effects, ensuring accurate displacement readings.
Conclusions:
- The developed all-fiber SMS sensing system enables accurate, real-time, wide-range displacement monitoring for orthopedic external fixation.
- The system's ability to compensate for temperature variations enhances its reliability in clinical settings.
- This technology holds significant potential for improving patient outcomes in fracture management using the Ilizarov apparatus.
Related Concept Videos
02:18Interference and Diffraction
52.0K
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
52.0K
01:23RNA Interference
27.9K
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
27.9K
01:31Position and Displacement
25.1K
The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole. On the other...
25.1K
01:19Displacement Current
3.8K
Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
3.8K
02:57The Sense of Self: Reflected Self-Appraisal and Social Comparison
55.6K
According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
55.6K
01:49Golgi Apparatus
101.0K
As they leave the Endoplasmic Reticulum (ER), properly folded and assembled proteins are selectively packaged into vesicles. These vesicles are transported by microtubule-based motor proteins and fuse together to form vesicular tubular clusters, subsequently arriving at the Golgi apparatus, a eukaryotic endomembrane organelle that often has a distinctive ribbon-like appearance.
101.0K