Fibre Optical Multicomponent LDA-System Using the Optical Frequency Difference of Powerful DBR-Laser Diodes

Müller, H.; Wang, H.; Dopheide, D.

doi:10.1007/978-3-642-60911-4_2

Cited by 3 publications

(9 citation statements)

References 1 publication

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“…Finally three-component measurements can be made using a single 3D-LDV probe head. Probe heads capable of measuring two components are shown in figures 26(c) and (d) and those capable of measuring three components are shown in figures 26(e), (f ) and (g) with the individual measurement channels distinguished by using multiple detectors [101] or by multiplexing using wavelength [102][103][104], frequency [105][106][107], polarization [108][109][110] or time [111][112][113][114]. In the 3D reference beam probe shown in figure 26(e) the illumination is provided externally to the receiver probe [101] so additional optical access is required.…”

Section: Multi-component Ldvmentioning

confidence: 99%

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Optical fibre laser velocimetry: a review

Charrett

James

Tatam

2012

Meas. Sci. Technol.

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The applications of optical fibre technology to laser velocimetry are diverse and often critical to their successful implementation, particularly in harsh environments. Applications range from the use of optical fibres for beam delivery and scattered light collection, aiding the miniaturization of instrument probes, to the use of imaging fibre bundles for imaging the flow field in planar velocimetry systems. Optical fibre techniques have also been used in signal processing, for example fibre frequency shifters, and optical fibre devices such as amplifiers and lasers have been exploited. This paper will review the use of optical fibres in point-wise laser velocimetry techniques such as laser Doppler velocimetry and laser transit anemometry, as well as in planar measurement techniques such as particle imaging velocimetry and planar Doppler velocimetry.

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Section: Multi-component Ldvmentioning

confidence: 99%

“…This is similar to the approach using a frequency modulated semiconductor laser diode [96] as shown in figure 25 but with the measurement channels used for multi-component rather than multi-point measurements. Similarly, FDM may be achieved using three separate laser sources, together with the same beam configuration [107].…”

Section: Wavelength Multiplexingmentioning

confidence: 99%

Optical fibre laser velocimetry: a review

Charrett

James

Tatam

2012

Meas. Sci. Technol.

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“…Novel resonator concepts containing gratings have significantly enhanced the mode-hop-free single-frequency tuning range. Besides external-cavity lasers (ECLs) [38], monolithic diode lasers with distributed-feedback resonators (DFB) and distributed Bragg reflection (DBR) have been developed and applied for LDV [39]. DBR diode lasers allow precise frequency control and have line widths of below 10 MHz [36].…”

Section: Power Scalingmentioning

confidence: 99%

“…DBR diode lasers allow precise frequency control and have line widths of below 10 MHz [36]. The use of MOPA arrangements led to powerful LDVs with directional discrimination [40] (see section 4.1). However, emission wavelengths of around 1 µm are disadvantageous, especially when considering the scattering coefficient of small tracer particles (see section 2.3.3).…”

Section: Power Scalingmentioning

confidence: 99%

Laser Doppler velocimetry using powerful solid-state light sources

Czarske

2006

Meas. Sci. Technol.

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Opto-electronic measurement techniques are well established in fluid flow investigations. Their advantages are that they are non-intrusive, provide highly accurate measurement data and have fast response times. Laser Doppler velocimetry (LDV) is one of the most important methods for velocity measurements with high spatial and temporal resolution. Diode lasers and diode-pumped solid-state lasers as well as glass fibres and micro-optics are employed to an increasing extent. Particularly, the development of solid-state lasers proceeds rapidly. New lasers with improved properties such as high-power fundamental-mode emission make it possible to develop enhanced LDV sensor heads. This may open up new fields of application, for example in medicine and aerospace technology. The aim of this review is to describe the present state-of-the-art in LDV and to demonstrate how new laser concepts can still contribute to the development of new, improved LDV sensors. For that purpose, solid-state lasers such as diode lasers and diode-pumped solid-state lasers are introduced, and concepts of communication engineering for accomplishing directional multi-component velocity measurements are discussed. Also, velocity measurements with high spatial resolution are reported. A conclusive overview of applications and an outlook on future challenges are outlined.

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“…To avoid selection problems in finding appropriate monomode lasers with almost equal emission frequencies and overlapping tuning ranges without mode hopping, DBR laser diodes (distributed Bragg reflector) have been applied successfully. Due to the Bragg reflector resonator structure these DBR laser diodes have well defined emission wavelengths and mode hopping free tunable ranges in the nm-range, so that they are very well suited for LDA concepts using one laser source for each beam, see Wang et al (1994b) and Müller et al (1996a).…”

Section: Overview About Realized Lda Performance Improving Techniquesmentioning

confidence: 99%

Realization of high performance LDA-systems using optical amplifiers, high power semiconductor lasers and optical fiber lasers

Dopheide

Többen

Strunck

et al. 2000

J Vis

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Advanced novel techniques for sophisticated LDA applications are presented in this paper.By applying laser sources with high output powers like MOPA-lasers (master oscillator power amplifier), fiber lasers and booster fiber amplifiers to increase the laser power in the measuring volume and by amplifying the scattered light power with optical fiber preamplifiers to increase the sensitivity of the receiving units, the signal-to-noise-ratio of laser Doppler signals is drastically improved and the overall performance of a laser Doppler anemometer is significantly enhanced.

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Fibre Optical Multicomponent LDA-System Using the Optical Frequency Difference of Powerful DBR-Laser Diodes

Cited by 3 publications

References 1 publication

Optical fibre laser velocimetry: a review

Optical fibre laser velocimetry: a review

Laser Doppler velocimetry using powerful solid-state light sources

Realization of high performance LDA-systems using optical amplifiers, high power semiconductor lasers and optical fiber lasers

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