Direction Sensitive LDA Using a Single High-Frequency Pulsed Laser Diode And a Single Photodetector Without Frequency Shifting

Wang, H.; Müller, H.; Strunck, V.; Dopheide, D.

doi:10.1007/978-3-642-79965-5_18

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…However, the large size of Bragg cells does not allow the integration into a miniaturized sensor. An alternative method for directional discrimination is the homodyne technique [9,14,25]. Generating a pair of signals in quadrature, the sign of their phase difference determines the direction of the flow [23].…”

Section: Discussionmentioning

confidence: 99%

“…The quadrature phase shift is undertaken by generating an optical delay for one diffraction order by inserting a thin plate of glass, into the Fourier plane of the imaging optical system. Discrimination of the scattered light to two signal processing channels is achieved by using two optical wavelengths [14] or laser pulses [25]. By means of quadrature demodulation the amount and direction of the flow can be determined.…”

Section: Discussionmentioning

confidence: 99%

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A miniaturized dual-fibre laser Doppler sensor

Czarske

2001

Meas. Sci. Technol.

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The integration of laser Doppler velocimeters into small components such as wind tunnel models requires highly miniaturized sensors. This paper presents a novel miniaturization concept, suitable for reducing the dimensions of a fibre-coupled laser Doppler sensor to a millimetre scale. Only a few low-cost, passive elements such as two fibres, a diffraction grating and refractive optics are employed. Preliminary results of a realized sensor head, of about 7 mm diameter and about 15 mm length, are presented. The generated measurement volume of about 0.02 mm diameter and about 0.1 mm length allows highly spatially-resolved velocity measurements. The outstanding features of the sensor are its simplicity, ruggedness and the high optical power of about 0.5 W in the measurement volume.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

A miniaturized dual-fibre laser Doppler sensor

Czarske

2001

Meas. Sci. Technol.

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“…A multiple-component LDV system was realized by a pulsed diode laser [26,73]. Also, directional discrimination can be accomplished by TDM [141]. However, the optical pulse power of diode lasers is limited to around 1 W and especially TDM techniques based on external optical switches [142] have strict power limits.…”

Section: Multi-component Velocity Measurement Techniquesmentioning

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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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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Direction Sensitive LDA Using a Single High-Frequency Pulsed Laser Diode And a Single Photodetector Without Frequency Shifting

Cited by 3 publications

References 2 publications

A miniaturized dual-fibre laser Doppler sensor

A miniaturized dual-fibre laser Doppler sensor

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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