DLR Portal
Home
|
Sitemap
|
Contact
Imprint and terms of use
Privacy
Cookies & Tracking
|
Deutsch
You are here:
Home
:
Departments
:
Engine Measurement
Advanced Search
News
Institute
Departments
Combustor
Combustion Test
Fan and Compressor
Numerical Methods
Engine
Engine Acoustics
Engine Measurement
Optische Messverfahren
Turbine
Facilities
Abgeschlossene EU-Projekte
Publications
Offers
Service & Links
Print
DGV System Specifications
Recording Principle
optimized for time-averaging (integrating) velocity measurements
applicable to stationary (steady) flows
single receiver - three light sheet approach
exposure times from a few milliseconds up to 1 minute per image pair
phase-averaged measurements possible by laser modulation using Bragg cell
Measurement Characteristics
measurement uncertainty better than 1 m/s RMS
measurement reproducability better than 0.1 m/s RMS (based on spatial velocity average)
field of view typically 10 - 50 cm (in principle >1m
2
)
DGV Receiver
single objective system with internal beam-splitter and relay lens
Detectors: thermoelectrically-cooled CCD sensors:
1) LaVision LightStar
dynamic range = 14 bits (16384 levels)
spatial resolution: 384 × 292 pixels
signal-to-noise better than 400:1
2) PCO Sensicam Long-Exposure
dynamic range = 12 bits (4096 levels)
spatial resolution: 1280 × 1024 pixels
signal-to-noise better than 150:1 (600:1 with 4x4 pixel binning)
fiber optic data transmission (5 m to >1000 m)
Laser
CW Argon-ion laser operating in single frequency mode at l = 514,5 nm, Pmax = 2 Watts.
stabilization better than +/- 1 MHz using temperature controlled etalon and iodine absorption cell
stabilization on hyperfine structure of iodine possible for calibration of absorption cells
Light sheet generators
based on scanning beam approach
essentially top-hat intensity profile
scanning frequencies up to 400 Hz
parallel light sheet height up to 140 mm
fiber optic light delivery from laser head
Contact
Dr.rer.nat. Guido Stockhausen
German Aerospace Center
Institute of Propulsion Technology
,
Triebwerksmesstechnik
Köln
Tel.: +49 2203 601-3536
Dr.phil. Christian Willert
German Aerospace Center
Institute of Propulsion Technology
,
Triebwerksmesstechnik
Köln
Tel.: +49 2203 601-2308
Links
Brennkammer-Anwendungen
Endoskopische Messtechnik in Flugzeugtriebwerken
SAMURAI
The principle of DGV
Phase-resolved measurements of engine exhaust flows
Measurement in the wake of a car model
Measurement inside an engine inlet duct
Measurement inside an engine inlet duct
Laser stabilization
Light sheet optics
DGV-camera
Related Topics
Instrumentation and Photography
Communications and Radar
Copyright © 2024 German Aerospace Center (DLR). All rights reserved.