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- Beitrag zu einem Tagungsband (17) (entfernen)
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- Englisch (17)
Schlagworte
- Strain sensor (4)
- Fibre optic sensor (3)
- Humidity sensor (3)
- Long period grating (3)
- OTDR (3)
- POF sensor (3)
- Healthcare monitoring (2)
- Heart rate sensor (2)
- Long period grating (LPG) (2)
- Macrobending sensor (2)
We investigated the capabilities of long period gratings (LPG) in single-mode microstructured polymer optical fibre (mPOF) for humidity sensing. For that mPOF LPGs were exposed to different humidity levels
at a constant temperature of 30°C in a climate chamber. During the long term tests, which took up several weeks, the humidity was changed in several steps while mPOF LPG wavelength and fibre attenuation were measured.
We also measured the water uptake of mPOF in environment with different relative humidity.
This paper reports on a fibre optic sensor for heart rate measurement which is developed within the framework of the FP7 EU project i-Protect. Goal is integration of the sensor into personal protective equipment Two different sensor prototypes based on polymer optical fibre (POF) were developed. One is based on long period gratings in microstrutured POF and the other one is based on macrobending effects in POF.
We investigated to our knowledge for the first time the capabilities of long period gratings (LPG) in single-mode microstructured polymer optical fibre (mPOF) as real-time gamma dosimeter. The fibre is made from polymethyl methacrylate (PMMA) with a polycarbonate jacket. We measured the radiation-induced wavelength shift of the mPOF LPG loss feature wavelength and the radiation-induced attenuation of a mPOF for
different wavelength between 600 nm and 800 nm for gamma radiation with an energy distribution between 6 keV and 18 keV.
This paper reports on a fiber optic sensor for heart rate measurements. The sensor will be integrated into personal protective equipment within the framework of the FP7 EU project i-Protect. Two different sensor prototypes were developed. One is based on fiber Bragg gratings in silica fiber and the other one is based on macrobending effects in polymer optical fiber.
We investigated the sensing properties of a single mode Poly Methyl Methacrylate (PMMA) Microstructured Polymer
Optical Fibre (MPOF) with mechanically imprinted Long Period Grating (LPG). We measured the influence of strain to
the LPG wavelength which showed the viscoelastic nature of PMMA. We also measured the influence of temperature
and humidity to the LPG wavelength.
We report on three respiration sensors based on pure optical technologies developed during the FP6 EU project
OFSETH. The developed smart medical textiles can sense elongation up to 3%, while maintaining the stretching
properties of the textile substrates for a good comfort of the patient. The sensors, based on silica and polymer fibre, are
developed for monitoring of patients during MRI examination. The OFSETH harness allows a continuous measurement
of respiration movements while all vitals organs are free for medical staff actions. The sensors were tested in MRI
environment and on healthy adults.
The potential of the use of POF as distributed sensors in several application fields has been successfully demonstrated. The distributed POF sensors have moved from the laboratory to the field. The paper presents the recent progress in the development of distributed POF sensors and addresses the main challenges to this innovative technology.
We investigated sensing properties of single mode poly methyl methacrylate (PMMA) microstructured polymer optical
fibres (MPOF) with mechanically imprinted long period gratings (LPG). After preparation of the MPOF end-faces the
samples were elongated with silica fibres. These samples were used to measure the influence of strain to the LPG
wavelength which showed the viscoelastic nature of PMMA. We also measured the influence of temperature and
humidity. The results show that MPOF LPGs are well suited for strain sensing. One MPOF LPG was stitched to a
textile. Using this textile we measured a simulated respiratory motion.