Wetness and Efficiency Measurements in L.P. Turbines With an Optical Probe As an Aid to Improving Performance

1987 ◽  
Vol 109 (1) ◽  
pp. 85-91 ◽  
Author(s):  
P. T. Walters
Keyword(s):  
Electromagnetic Scattering ◽  
Scattering Theory ◽  
Light Transmission ◽  
Optical Probe ◽  
Steam Flow ◽  
Diagnostic Data ◽  
Absolute Value ◽  
Turbine Efficiency ◽  
Condensing Flows

An absolute value for the wetness fraction in a partially condensed steam flow may be calculated from measurements of light transmission using the results of fundamental electromagnetic scattering theory. A probe is described that uses this principle for measuring radial wetness profiles in the final stages of L.P. turbines. Results are presented to show that the probe will provide reliable values for overall L.P. turbine efficiency and valuable diagnostic data on the performance of individual stages operating with wet or condensing flows.

Wetness and Efficiency Measurements in L.P. Turbines With an Optical Probe as an Aid to Improving Performance

1985 ◽  
Author(s):  
P. T. Walters
Keyword(s):  
Electromagnetic Scattering ◽  
Scattering Theory ◽  
Light Transmission ◽  
Optical Probe ◽  
Steam Flow ◽  
Diagnostic Data ◽  
Absolute Value ◽  
Turbine Efficiency ◽  
Condensing Flows

An absolute value for the wetness fraction in a partially condensed steam flow may be calculated from measurements of light transmission using the results of fundamental electromagnetic scattering theory. A probe is described that uses this principle for measuring radial wetness profiles in the final stages of L.P. turbines. Results are presented to show that the probe will provide reliable values for overall L.P. turbine efficiency and valuable diagnostic data on the performance of individual stages operating with wet or condensing flows.

scholarly journals Soft and plasmonic hydrogel optical probe for glucose monitoring

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jingjing Guo ◽  
Bingqian Zhou ◽  
Zhou Du ◽  
Changxi Yang ◽  
Lingjie Kong ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Sensor ◽  
Glucose Sensor ◽  
Light Transmission ◽  
Resonance Effect ◽  
Enzymatic Reaction ◽  
Glucose Monitoring ◽  
Optical Probe ◽  
Localized Surface Plasmon ◽  
Hydrogel Matrix

Abstract Glucose monitoring sensors with high softness and flexibility are critical for the developments of wearable and implantable healthcare devices that enable diagnosis, prognosis, and management of diabetes. The design and implementation of such sensors have been extensively exploited by electrochemical strategies, which, however, suffer from poor reusability and complex modification procedures, and necessitate frequent calibration or sensor replacement due to enzymatic reaction instability. Here, a soft and plasmonic hydrogel optical sensor is created for quantitative and continuous glucose monitoring under physiological conditions. The optical sensor consists of a flexible optical fiber made from composites of gold nanoparticles and glucose-responsive hydrogels. The reversible binding of glucose to the nanocomposite optical fiber results in dynamic volume expansion of the hydrogel matrix, which modulates the localized surface plasmon resonance effect, enabling glucose to be quantified from the light transmission. To achieve robust readout, a dual-wavelength differential approach is employed to endow the sensor with self calibration capability. We show that the sensor is reversible and reusable for detecting physiological glucose levels with high linearity and negligible hysteresis. The soft and flexible glucose sensor holds great promises of serving as a minimally-invasive probe for point-of-care glucose monitoring in clinics.

scholarly journals CFD analysis of optical probe interaction with wet steam flow field

2018 ◽  
Vol 180 ◽  
pp. 02045 ◽  
Author(s):  
Michal Kolovratník ◽  
Gukchol Jun ◽  
Ondřej Bartoš
Keyword(s):  
Flow Field ◽  
High Pressures ◽  
Optical Probe ◽  
Steam Flow ◽  
Steam Turbines ◽  
Wet Steam ◽  
Water Steam ◽  
Flow Geometry ◽  
Phase Size ◽  
Wet Steam Flow

In the frame of the measurement feasibility study of the liquid phase size distribution structure in steam turbines at intermediate and high pressures, on CTU the interaction of optical probes with the wet steam flow field is investigated. In order to validate and refine the existing knowledge, a new series of CFD simulations were performed, considering turbine flow geometry, water steam characteristics according to IAPWS97 formulation, and improved boundary conditions and quality of the computing mesh. This paper briefly presents the newly obtained results

Sign in / Sign up

Export Citation Format

Share Document