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Expanding the Vision of Sensor Materials (1995) / Chapter Skim
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APPENDIX D: SENSOR TECHNOLOGY FOR MONITORING POLYMER CURING
Pages 114-121

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From page 114...
... A new sensor technology is needed that can measure several different microscopic properties and thus provide a direct, accurate measure of the extent of cure. This appendix points out the limitations of using temperature sensing alone to estimate the degree of cure and provides background information on a new approach that exploits fiber optics to provide multiproperty sensing.
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From page 115...
... Provide continuous information; no threshold, peak, or integration for data acquisition. Characteristics response time 1-5 s.
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From page 116...
... Phase modulation is much more accurate than intensity modulation and can be used over a wider dynamic range. However, phase modulated sensors are almost always more expensive since the electronic processing equipment must be very sophisticated.
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From page 117...
... This effect is used in a class of sensor where a light pulse from a laser is transmitted into the optical fiber and the backscatter from the optical inhomogeneity is measured as a function of the delay time relative to the incident pulse. While there are many variations in the details for implementing this sort of device, it typically involves the construction of a miniaturized FabryPerot interferometer on the fiber end and the construction of a simple fringe counting system to monitor changes in the optical path length.
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From page 119...
... Chemical Analysis Key research need: Measure molar concentrations of oligomers using depolarized Raman scattering. 119 continued on next page
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From page 120...
... Heat Capacity Ratio Key research need: Determine with Nd:YAG laser using RayleighlBrillouin scattering. Sound Attenuation Factor Key research need: Measure using Brillouin scattering via Fabry Perot interferometer/spectrum analyzer.
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From page 121...
... For example, deconvolution of the Raman spectra will yield line widths from which the viscosity of the curing resin may be deduced. Similarly, the Rayleigh-Brillouin spectrum contains information on the adiabatic sound speed, acoustic attenuation coefficient, thermal diffusion, and a number of other parameters; but here again, no work has been done to extract this information for composite materials.
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Key Terms

  • sensor technology
  • research required
  • refractive index
  • optical fiber
  • multiproperty sensing

  • resin temperature
  • reinforcing fiber
  • phase modulated
  • near infrared
  • term research

  • temperature sensing
  • optical path
  • raman scattering
  • determine using
  • photon scattering

  • fiberoptic sensors
  • fiberoptic sensor
  • using brillouin
  • sound speed
  • fabry perot

  • optical fibers
  • continuous information
  • fiber optics
  • optical inhomogeneity
  • rayleigh scattering

  • monitored photometrically
  • fiber optic
  • resin using
  • intrinsic fiberoptic
  • using fiber


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