Joint research between GIST Professor Heung Cho Ko and Seoul National Professor Sung-Hoon Choa has developed technology to improve the sensitivity of strain sensors
Joint research between GIST Professor Heung Cho Ko and Seoul National Professor Sung-Hoon Choa has developed technology to improve the sensitivity of strain sensors
□ Joint research between Professor Heung Cho Ko of the Gwangju Institute of Science and Technology (GIST, President Seung Hyeon Moon) and Professor Sung-Hoob Choa of Seoul National University has succeeded in producing a strain sensor with better sensitivity control.
∘ Strain sensors are being applied to future healthcare and tele-control systems, so researchers are working to improve the range and sensitivity of measurable strain rates.
∘ However, because it is very difficult to recognize a wide range of strains with a high degree of sensitivity, a strain sensor is needed that is capable of realizing a high degree of sensitivity to a specific strain according to the specific purpose and location of the strain sensor. However, it is difficult to fabricate such a sensor with low costs and uniform characteristics due to the increase in the manufacturing time required by conventional manufacturing methods.
□ By using the structure of the elastic body that forms the shape of the strain sensor rather than the sensor layer, the researchers improved the sensitivity of the strain sensor with a certain strain rate. By introducing a bending structure in the elastic body, the researchers succeeded in increasing the sensitivity by increasing the step and number of bending.
∘ When the element is deformed, the elongation of the thick part and the thin part of the elastic body is different, leading to the distribution of non-uniform cracks in the sensor layer. It was confirmed by optical analysis that a high number of cracks occurred at the boundary between the thick and thin parts.
∘ In addition, the simulation confirmed that the high shear strain at the interface between the thick and thin parts during element deformation plays an important role in forming a high number of cracks at the boundary along the axial strain. The actual patch-type type strain sensor was attached to the wrist and showed high sensitivity and applicability.
□ Professor Heung Cho Ko said, "Our strain sensor can be applied to healthcare monitoring systems that can confirm posture correction as well as bio-signals, and it is also expected to be applicable to remote surgery and robot control technology."
