Microwave processing of thermosets: non-contact cure monitoring and fibre optic temperature sensors

2003 ◽  
Vol 32 (8-9) ◽  
pp. 327-333 ◽  
Author(s):  
B. Degamber ◽  
G.F. Fernando
Keyword(s):  
Microwave Processing ◽  
Temperature Sensors ◽  
Fibre Optic ◽  
Cure Monitoring

YAG : R3+ (R = Ce, Dy, Yb) nanophosphor-based luminescent fibre-optic sensors for temperature measurements in the range 20–500 °C

2022 ◽  
Vol 52 (1) ◽  
pp. 94-99
Author(s):  
S K Evstropiev ◽  
V V Demidov ◽  
D V Bulyga ◽  
R V Sadovnichii ◽  
G A Pchelkin ◽  
...  
Keyword(s):  
Thermal Quenching ◽  
Signal Amplitude ◽  
Temperature Sensors ◽  
Yttrium Aluminium Garnet ◽  
Optical Fibres ◽  
Fibre Optic ◽  
Excitation Light ◽  
Yttrium Aluminium ◽  
Increasing Temperature ◽  
Silica Capillary

Abstract We report the development of a group of luminescent fibre-optic temperature sensors that use Ce3+-, Dy3+-, and Yb3+-doped yttrium aluminium garnet (YAG) nanophosphors as thermosensitive materials. The nanophosphors have been prepared in the form of powders with a crystallite size from 19 to 27 nm by a polymer ? salt method and exhibit bright luminescence at 550 (YAG : Ce3+), 400, 480 (YAG : Dy3+), and 1030 nm (YAG : Yb3+). The sensor design includes a silica capillary, partially filled with a nanophosphor, and two large-aperture multimode optical fibres located in the capillary, which deliver excitation light and receive and transmit the photoluminescence signal. The photoluminescence signal amplitude of all the sensors decreases exponentially with increasing temperature, pointing to characteristic thermal quenching of photoluminescence and adequate operation of the devices up to 500 °C. The highest temperature sensitivity among the fibre-optic sensors is offered by the YAG : Ce3+ nanophosphor-based devices.

102 Cure monitoring of CCP by fibre optic measurement of refractive index

2006 ◽  
Vol 2006.5 (0) ◽  
pp. 16-19
Author(s):  
Tatsuro KOSAKA ◽  
Daisuke UEDA ◽  
Katsuhiko OSAKA ◽  
Yoshihiro SAWADA
Keyword(s):  
Refractive Index ◽  
Fibre Optic ◽  
Cure Monitoring

Cure Monitoring of Epoxy Resin by Simultaneous DSC/FTIR

2014 ◽  
Vol 881-883 ◽  
pp. 905-908
Author(s):  
Li Wei Wang ◽  
Gerard F. Fernando
Keyword(s):  
Cross Linking ◽  
Resin System ◽  
Fibre Optic ◽  
Cure Monitoring ◽  
Epoxy Amine ◽  
Fibre Optic Probe ◽  
The Cross ◽  
Optic Probe ◽  
Conventional Dsc ◽  
Kinetics Of

The cross-linking kinetics of an epoxy/amine resin system was studied using the conventional DSC and FTIR spectroscopy, respectively. Conventional DSC was modified to accommodate two fibre optic probes which could be used to monitor the spectra of epoxy/amine resin system during cure. The cross-linking kinetics for the epoxy/amine resin system obtained via the conventional DSC and FTIR and simultaneous DSC/FTIR were similar. The feasibility of using a simple bifurcated fibre optic probe to link the DSC to the FTIR spectrometer was demonstrated.

scholarly journals Dynamic Characterisation of Fibre-Optic Temperature Sensors for Physiological Monitoring

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 221
Author(s):  
Joanna M. Coote ◽  
Ryo Torii ◽  
Adrien E. Desjardins
Keyword(s):  
Flow Measurement ◽  
Biomedical Applications ◽  
Temperature Sensors ◽  
Transfer Model ◽  
Thermal Treatments ◽  
Fibre Optic ◽  
The Finite Element Method ◽  
Fibre Optics ◽  
Optical Heating ◽  
Thermal Techniques

Fast, miniature temperature sensors are required for various biomedical applications. Fibre-optics are particularly suited to minimally invasive procedures, and many types of fibre-optic temperature sensors have been demonstrated. In applications where rapidly varying temperatures are present, a fast and well-known response time is important; however, in many cases, the dynamic behaviour of the sensor is not well-known. In this article, we investigate the dynamic response of a polymer-based interferometric temperature sensor, using both an experimental technique employing optical heating with a pulsed laser, and a computational heat transfer model based on the finite element method. Our results show that the sensor has a time constant on the order of milliseconds and a −6 dB bandwidth of up to 178 Hz, indicating its suitability for applications such as flow measurement by thermal techniques, photothermal spectroscopy, and monitoring of thermal treatments.

Review of luminescent based fibre optic temperature sensors

Sensor Review ◽  
2005 ◽  
Vol 25 (1) ◽  
pp. 56-62 ◽  
Author(s):  
M. McSherry ◽  
C. Fitzpatrick ◽  
E. Lewis
Keyword(s):  
Temperature Sensors ◽  
Fibre Optic
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