Applications of electro-optical instrumentation in turbine engine development
Abstract
A brief review is presented of the types of electro-optic devices which are available for instrumentation applications, taking into account lasers and light emitting diodes, the use of the photographic process for the detection of light, other photoelectric detectors, fiber optics, modulators, and linear and angular encoders. It is pointed out that fiber optics is extensively used in gas turbine instrumentation work for devices ranging from borescopes to optical pyrometers. Applications of electro-optical instrumentation to turbine engine studies are related to temperature measurement, mechanical measurements, and flow measurement. Optical pyrometers are used for metal temperature measurements, and Raman scattering is employed for gas temperature determinations. Vibration and strain measurements can be performed with the aid of holography, speckle photography, diffraction gratings, optical sensors, reflected laser beams, and optical heterodyning. Attention is also given to clearance and displacement measurements, holographic flow visualization, and laser velocimetry.
- Publication:
-
24th International Instrumentation Symposium
- Pub Date:
- 1978
- Bibcode:
- 1978isa..symp..305A
- Keywords:
-
- Electro-Optics;
- Engine Monitoring Instruments;
- Gas Turbine Engines;
- Optical Measuring Instruments;
- Displacement Measurement;
- Flow Measurement;
- Laser Applications;
- Pyrometers;
- Raman Spectra;
- Instrumentation and Photography