CN-224206820-U - Human body limb pressure field measuring device

CN224206820UCN 224206820 UCN224206820 UCN 224206820UCN-224206820-U

Abstract

The utility model discloses a human body limb pressure field measuring device based on an optical frequency domain reflection technology, which comprises a tunable laser, a coupler, a circulator, a polarization controller, a photoelectric detector and a high-speed oscilloscope which are sequentially connected. The measuring device has excellent corrosion resistance, high monitoring timeliness and high spatial resolution.

Inventors

HU JUNHUI
SONG ZHUO
Liang Chaoping
YANG LI
LU HANGLIN

Assignees

广西师范大学

Dates

Publication Date: 20260508
Application Date: 20250529

Claims (7)

1. The utility model provides a human limbs pressure field measuring device which characterized in that includes tunable laser, coupler, circulator, polarization controller, photoelectric detector, the high-speed oscilloscope of connecting in proper order, wherein: The whole system is divided into two parts, namely a tunable laser, a first optical fiber coupler, a second optical fiber coupler, a parallel delay optical fiber, a single-mode optical fiber, a fourth optical fiber coupler and a first photoelectric detector are sequentially connected to form an external sampling clock unit to be connected with a high-speed oscilloscope; The light output by the tunable laser is divided into two paths by a first optical fiber coupler, wherein one path of light sequentially passes through a second optical fiber coupler and respectively enters a parallel delay optical fiber and a single-mode optical fiber, and enters a first photoelectric detector to form an external sampling clock unit through the convergence of a fourth optical fiber coupler; the other path of light sequentially passes through a third optical fiber coupler, respectively enters a polarization controller and an a port of an optical fiber circulator which are connected in parallel, light coming out of a b port of the optical fiber circulator enters a test platform, backward Rayleigh scattered light of the test platform enters a c port through the b port of the optical fiber circulator, and the light passing through the polarization controller is mixed in a fifth optical fiber coupler and enters a second photoelectric detector to form a sensing optical path unit, and electric signals of an external sampling clock unit and the sensing optical path unit are subjected to data acquisition and analysis by a high-speed oscilloscope; the test platform is characterized in that single-mode fibers are laid in a flat manner to form a semicircular arc-shaped annular body with a rectangular middle part and symmetrical two ends, the annular body is wound in multiple layers, the number of the annular body is n, the rectangular side lengths are L respectively, the semicircular arc-shaped diameters are R respectively, the single-mode fibers on one homodromous side of all the annular bodies are uniformly arranged on a flexible flat plate, and the interval between every two adjacent optical fibers is R/n; the connection is carried out by adopting an FC/APC flange.
2. The human limb pressure field measuring device according to claim 1, wherein the tunable laser is of model TSL-550, tuning range 1520-1580nm and tuning speed 60nm/s.
3. The human body limb pressure field measuring device according to claim 1, wherein the type of the photoelectric detector is PDB430C, the working band is 800-1700 nm, and the response bandwidth is 350MHz.
4. The human limb pressure field measuring device according to claim 1, wherein the high-speed oscilloscope model is MSO-S254A, bandwidth is 2.5GHz, and sampling rate is 20GSa/S.
5. The device for measuring the pressure field of the human body limb according to claim 1, wherein the split ratio of the first optical fiber coupler to the third optical fiber coupler is 99%:1%, 1% of light split by the first optical fiber coupler enters an external clock through the second optical fiber coupler, 99% of light enters the sensing interferometer through the third optical fiber coupler, 1% of light split by the third optical fiber coupler enters the polarization controller, and 99% of light split by the third optical fiber coupler enters an a port of the optical fiber circulator.
6. The human limb pressure field measurement device according to claim 1, wherein the split ratio of the second, fourth and fifth fiber couplers is 50%:50%.
7. The human limb pressure field measuring device according to claim 1, wherein the length of the delay fiber is 200m, and the model is SM-28e.

Description

Human body limb pressure field measuring device Technical Field The utility model relates to an optical fiber sensing technology, in particular to a human body limb pressure field measurement device based on an optical frequency domain reflection technology. Background With the progress of society, people pay more and more attention to health. The abnormal distribution of the human body limb pressure field is qualitatively and quantitatively analyzed, potential deformity risks can be monitored, and then a personalized intervention scheme is formulated, so that the method has important significance in human body health management. In addition, the exercise protection scheme is customized according to different exercise types, and the exercise performance can be effectively improved. Currently, the measurement of the human body limb pressure field in the market mainly depends on technologies such as piezoelectric sensors, strain gauges, capacitive sensors and the like. However, the discrete point distribution mode of the technologies leads to limited spatial resolution, and is difficult to accurately capture the finely distributed characteristics of the human body limb pressure field, and particularly under the condition of complex gait or high dynamic load, the measurement precision and stability of the technology are greatly limited. Furthermore, the rigid structure and limited lifetime of piezoelectric sensors also limit their reliability for long-term use. The four-limb pressure field measurement and shape reconstruction based on the optical frequency domain reflection distributed optical fiber sensing technology can realize high-density and continuous distribution pressure measurement, has millimeter-scale spatial resolution capability and high sensitivity, can accurately reconstruct three-dimensional distribution characteristics of the four-limb pressure field, not only overcomes the limitations of the traditional sensor, but also provides more accurate data support for foot biomechanics research, gait analysis and medical rehabilitation, and has important scientific significance and application value. Disclosure of Invention The utility model aims at overcoming the defects of the prior art and provides a human body limb pressure field measuring device. The device has excellent electromagnetic interference resistance, high stability, repeatability, high spatial resolution and simple structure. The technical scheme for realizing the aim of the utility model is as follows: The utility model provides a human limbs pressure field measuring device, includes tunable laser, coupler, circulator, polarization controller, photoelectric detector, the high-speed oscilloscope of connecting in proper order, wherein: The whole system is divided into two parts, namely a tunable laser, a first optical fiber coupler, a second optical fiber coupler, a parallel delay optical fiber, a single-mode optical fiber, a fourth optical fiber coupler and a first photoelectric detector are sequentially connected to form an external sampling clock unit to be connected with a high-speed oscilloscope; The light output by the tunable laser is divided into two paths by a first optical fiber coupler, wherein one path of light sequentially passes through a second optical fiber coupler and respectively enters a parallel delay optical fiber and a single-mode optical fiber, and enters a first photoelectric detector to form an external sampling clock unit through the convergence of a fourth optical fiber coupler; the other path of light sequentially passes through a third optical fiber coupler, respectively enters a polarization controller and an a port of an optical fiber circulator which are connected in parallel, light coming out of a b port of the optical fiber circulator enters a test platform, backward Rayleigh scattered light of the test platform enters a c port through the b port of the optical fiber circulator, and the light passing through the polarization controller is mixed in a fifth optical fiber coupler and enters a second photoelectric detector to form a sensing optical path unit, and electric signals of an external sampling clock unit and the sensing optical path unit are subjected to data acquisition and analysis by a high-speed oscilloscope; the test platform is characterized in that single-mode fibers are laid in a flat manner to form a semicircular arc-shaped annular body with a rectangular middle part and symmetrical two ends, the annular body is wound in multiple layers, the number of the annular body is n, the rectangular side lengths are L respectively, the semicircular arc-shaped diameters are R respectively, the single-mode fibers on one homodromous side of all the annular bodies are uniformly arranged on a flexible flat plate, and the interval between every two adjacent optical fibers is R/n; the connection is carried out by adopting an FC/APC flange. The model of the tunable laser is TSL-550, the tuning range is 152