2 edition of Flight testing of a luminescent surface pressure sensor found in the catalog.
Flight testing of a luminescent surface pressure sensor
1992 by National Aeronautics and Space Administration, Ames Research Center, National Technical Information Service, distributor in Moffett Field, Calif, [Springfield, Va .
Written in English
|Statement||B.G. McLachlan ... [et al.].|
|Series||NASA technical memorandum -- 103970.|
|Contributions||McLachlan, B. G., Ames Research Center.|
|The Physical Object|
The first fluorescent sensor system was described by Bergman 35 in and comprised a UV light source, an oxygen-sensitive fluorescent layer composed of porous glass or a thin film of polyethylene soaked with the oxygen-sensitive probe fluoranthene, and a photodetector. Human beings can live up to 1 month without food, up to 2 weeks without water, but not longer than maximally 10 min without supply of oxygen. Damage to the aircraft disrupts or changes the signal patterns from the baseline communication signals. Work is ongoing on the best spacing and placement for these sensors on aircraft, Sandia mechanical engineer Stephen Neidigk said. Luminance Meter Calibration :: Usually measured with an imaging photometer know as a luminance meter or spectroradiometer. Convection: This is the dominant factor due to the high speed of the air around the fuselage.
Human beings can live up to 1 month without food, up to 2 weeks without water, but not longer than maximally 10 min without supply of oxygen. Calculating what frequency the receiver will hear is quite easy: f. Furthermore, according to the paper, the team believes that there is still "significant potential to improve the device's temporal performance and sensitivity. More specifically, we review sensors based on the measurement of absorbance, reflectance and luminescence including fluorescence, phosphorescence, bioluminescence and chemiluminescence. The first group, called infrasone has a frequency below 20 Hz.
Primary and secondary thermometers[ edit ] A thermometer is called primary or secondary based on how the raw physical quantity it measures is mapped to a temperature. Spatial Distribution of Sources :: Characterize the temporal and spatial intensity distribution of LEDs, lamps and luminaires for general and automotive lighting with a diverse selection of robust and accurate gonio Clinical thermometers and many electronic thermometers are usually readable to 0. Credit: Randy Montoya Nine commercial aircraft flying regular routes are on the frontier of aviation safety, carrying sensors that monitor their structural health along with their routine maintenance. Camera[ edit ] Cameras used in robotics are commonly built around a image Sensor.
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That is, does the same thermometer give the same reading for the same temperature or do replacement or multiple thermometers give the same reading? The flight tests complement laboratory performance testing at Sandia to provide the critical step in a decade-long journey to enhance airline safety through a more comprehensive program of Structural Health Monitoring.
Thus if the same type of thermometer is calibrated in the same way its readings will be valid even if it is slightly inaccurate compared to the absolute scale.
Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. Image source: Heptagon. The effect was found to be fully reversible within 1—2 s. We refer to a sensing element as a material composed of both an oxygen-sensitive probe OSP and an appropriate polymer matrix that acts as a host or support see Table 1.
The choice of the polymer and any additives is a very critical step in sensor development. He is one of the 10 curators of Angewandte Chemie and the editor of two other journals.
Acellent's software measures and analyzes any changes, called Flight testing of a luminescent surface pressure sensor book "damage index," and sends Flight testing of a luminescent surface pressure sensor book alert to the inspector.
Note that the boiling point of water varies with pressure, so this must be controlled. The mobile tablet-based system supplies information on the operational state of industrial machinery and plant equipment and can inform operators if a part needs to be replaced or if a repair can be postponed.
The system is based on the measurement of either fluorescence intensity or fluorescence decay time, both of which are affected by oxygen. They consist of a light source, usually an IR diode which signal can be modulated and a light detector, which can be as simple as a light sensitive diode or transistor with an amplification circuit or a more complex IC complete with filters and TTL level outputs.
Damage to the aircraft disrupts or changes the signal patterns from the baseline communication signals. Sensing i. Brennan and Prof.
That's why we are working on automatically assigning meaning to the results generated by the system and then translating this into useful information for the user.
The UT Austin researchers primarily pioneer scanning probe measurements and performed the piezoelectric force measurement of the thin-film transistor devices built by their collaborators from the Integrated Electronics and Biointerfaces Laboratory at UC San Diego.
Light Based Sensors[ edit ] Reflection: short range sensors[ edit ] This type of sensor detects objects at a range up to a few centimeter. If placed on the clad of an optical fiber at intervals over a certain distance, so-called distributed sensors are obtained that can be investigated by time-resolved methods of spectroscopy.
The cocktail may also be deposited at the tip of an optical fiber, on another kind of waveguide, or even be incorporated into its core or cladding.
The sensor does not actually measure oxygen concentration, but rather the difference between the amount of oxygen in the exhaust gas and the amount of oxygen in the supplied air.
Another design using this principle is Breguet's thermometer. Future users of the system need to be able to interpret the numerical data correctly. So the team designed snap-clip type connectors for the CVM sensors, like those used to plug a telephone landline into a wall outlet.
Reproducible temperature measurement means that comparisons are valid in scientific experiments and industrial processes are consistent.
CVM sensors are then mounted in areas of the aircraft known to experience fatigue. Moving the sensor back and forward towards an object moves the reflection beam along the light sensitive strip.
Credit: University of California - San Diego To demonstrate the commercial viability of the sensors, Dayeh and his co-authors collaborated with Synaptics, Inc. This supports applications such as real-time video chat filters or automatic selfie zoom adjustment.Zacwire —Digital Serial Output, Calibrated Sensor, 2 byte Zacwire —Digital Serial Output, Calibrated Sensor, 3 byte I2C - Digital output, Calibrated Sensor, 2 byte Code Port Type M 1 manifold port for Gauge and Absolute pressure types B 2 barbed ports for Gauge, Absolute and Differential pressure types** N Non ported ***.
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