Precise flow rate measurements of natural gas under high pressure with a laser Doppler velocity profile sensor

Büttner, Lars; Bayer, Christian; Voigt, Andreas; Czarske, Jürgen; Müller, H.; Pape, N.; Strunck, V.

doi:10.1007/s00348-008-0530-4

Cited by 15 publications

(6 citation statements)

References 11 publications

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“…When a small particle passes the measurement volume it scatters light from both fringe systems and the Doppler frequencies f 1,2 of the two coincident burst signals can be estimated. The quotient of the Doppler frequencies [7]…”

Section: Laser Doppler Velocity Profile Sensormentioning

confidence: 99%

“…Thus, the laser Doppler velocity profile sensor is applicable at very high and even at very low velocities, as they are generally found in microfluidics. Knowing the y-position and therefore the actual fringe spacing the particle velocity can be derived with the following equation [7]:…”

Section: Laser Doppler Velocity Profile Sensormentioning

confidence: 99%

“…In contrast, the heterodyne technique used in method (ii) avoids such an effect and has already been applied successfully to macroscopic measurements, e.g. natural gas flow measurements [7] and turbulence research [8]. However, due to the use of carrier frequencies, a detector with a sufficiently high bandwidth is necessary.…”

Section: Clk Ch1 Ch2mentioning

confidence: 99%

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Precise micro flow rate measurements by a laser Doppler velocity profile sensor with time division multiplexing

König¹,

Voigt²,

Büttner³

et al. 2010

Meas. Sci. Technol.

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This paper presents the measurement of flow rate inside a microchannel by using a laser Doppler technique. For this application a novel laser Doppler velocity profile sensor has been developed. Instead of parallel fringe systems, two superposed fan-like fringe systems with opposite gradients are employed to determine the velocity distribution inside the microchannel directly. The sensor utilizes the time division multiplexing technique to discriminate both fringe systems. A velocity uncertainty of 0.18% and a spatial resolution of 960 nm are demonstrated in the flow, which is the highest spatially resolved measurement by a laser Doppler technique published to date. Flow rate measurements, in the range of 30 μl min −1 , with a statistical uncertainty of 5 × 10 −4 are further presented. In comparison to a reference, by precise weighing, the mean deviation between both measurement principles amounts to 1%. With the advantage of high spatial resolution with simultaneous low velocity uncertainty, the laser Doppler velocity profile sensor offers a new tool for microfluidic diagnostics, e.g. in lab-on-a-chip systems or for drug delivery, which requires very small flow rates.

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Section: Laser Doppler Velocity Profile Sensormentioning

confidence: 99%

Section: Laser Doppler Velocity Profile Sensormentioning

confidence: 99%

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Precise micro flow rate measurements by a laser Doppler velocity profile sensor with time division multiplexing

König¹,

Voigt²,

Büttner³

et al. 2010

Meas. Sci. Technol.

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show abstract

“…[13][14][15][16] By using two superposed fanlike interference fringe systems, not only can the lateral velocity component be determined, but the axial position of tracer particles can be determined as well. Consequently, the spatial resolution is enhanced significantly with uncertainties in the micrometer range, opening new perspectives for the measurement of flows with high-velocity gradients.…”

Section: Introductionmentioning

confidence: 99%

Optic simulation and optimization of a laser Doppler velocity profile sensor for microfluidic applications

et al. 2010

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The application of laser Doppler velocimetry to microfluidic flows is usually prevented due the large size of the measurement volume of typically 100 m. A significantly higher spatial resolution can be achieved with the concept of the laser Doppler velocity profile sensor. However, the resolution is limited by wavefront distortions caused by aberrations of the optical setup. In this work, optical simulation software was employed to investigate the aberrations caused by the profile sensor setup by going from ideal to real lenses step by step. As the main source for the aberrations, the aspheric lens for collimating the laser beams was identified. On the basis of this simulation the setup of the velocity profile sensor could be optimized. The sensor was employed to measure the velocity profile in a microchannel. A spatial resolution of 1.2 m and a relative uncertainty of the velocity of 0.25% result, confirming the findings of the simulation. This demonstrates the potential of the optimized velocity profile sensor for flow measurements at the microscale.

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“…This allows the determination of not only the lateral velocities but also the axial positions of single tracer particles inside the measurement volume, and hence the velocity profile inside the measurement volume is reproduced with a high spatial resolution. The sensor has a sub-micrometer spatial resolution [6] and a small measurement uncertainty of velocities [7]. It has been successfully applied to a number of flow investigations ranging from microfluidics to turbulent flows [6,7,8,9].…”

mentioning

confidence: 99%

A5.3 - Velocity Measurements of Gap Flows at a Computer Hard Disk Model

Czarske¹,

Büttner²,

Shirai³

et al. 2011

Proceedings SENSOR 2011

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Precise flow rate measurements of natural gas under high pressure with a laser Doppler velocity profile sensor

Cited by 15 publications

References 11 publications

Precise micro flow rate measurements by a laser Doppler velocity profile sensor with time division multiplexing

Precise micro flow rate measurements by a laser Doppler velocity profile sensor with time division multiplexing

Optic simulation and optimization of a laser Doppler velocity profile sensor for microfluidic applications

A5.3 - Velocity Measurements of Gap Flows at a Computer Hard Disk Model

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