- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Effect of elastomer characteristics on fiber optic force sensing performance in biomedical robotics applications
摘要： Miniaturized and “smart” sensors are required for research in biology, physiology, and biomechanics, and they have extremely important clinical applications for diagnostics and minimally invasive surgery. Fiber optic sensors have been proven to provide advantages compared to conventional sensors and high potential for biomechanical and biomedical applications. They are small, easy to operate, minimally invasive with low risk, more accurate, and inexpensive. This paper reports the design and modeling of a fiber optic force sensor that is capable of measuring compliance for a contact force of up to 1 N. The main objective of this study is to design and model a fiber optic sensor capable of measuring the total force applied on an object. A polydimethylsiloxane (PDMS) elastomer film with a thickness of 1.2 mm is placed between an optical fiber tip and an object, and it is used for measuring the force applied on a rigid element. The compliance of the fiber optic force sensor is measured by recording the response of PDMS elastomer films under different load conditions. We use finite element modeling results as a basis for comparing experimental data. The agreement between theoretical predictions and experimental data is reasonable and within an acceptable range.
关键词： Force sensor,FEM analysis,Optical fiber,Elastomer,MATLAB analysis,LabVIEW,ANSYS simulation,Biomedical robotics
更新于2025-09-04 15:30:14
-
Ultrasound-Switchable Fluorescence Imaging via an EMCCD Camera and a Z-Scan Method
摘要： The spatial resolution of the conventional fluorescence imaging in centimeter-deep tissue is limited due to high light scattering. Ultrasound-switchable fluorescence (USF) imaging was recently developed to achieve high resolution in deep tissue. However, previous frequency-domain USF systems adopted a fiber bundle to collect the emitted fluorescence photons, which led to a few limitations, such as, first, low photon-collection efficiency; second, low efficiency for scanning a sample with an uneven surface; third, low imaging speed, because of the adoption of a raster scan and the long wait time for the tissue to cool down before starting the data acquisition at the next location. In this study, we proposed a camera-based USF imaging system to overcome these limitations. Thanks to the spatial information provided by the camera, a new scan method, Z-scan, was developed, and the imaging speed was improved four times over the raster scan. The USF imaging using the Z-scan for tissue samples was realized. The results were validated by a commercial micro-CT system.
关键词： deep-tissue fluorescence imaging,Ultrasound-switchable fluorescence,biomedical imaging
更新于2025-09-04 15:30:14