A novel spatial filtering velocimeter based on a photodetector array

Michel, K.; Fiedler, O.; Richter, Ales; Christofori, K.; Bergeler, S.

doi:10.1109/imtc.1997.610230

Cited by 10 publications

(5 citation statements)

References 8 publications

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“…As an example, Christoferi and Michel described in 1996 an SFV technique that avoids the blocking of light by directly using the columns of the camera pixels as the spatial filter [104]. This approach was later extended by employing the evaluation of quadrature signals [105]. In 2004, Bergeler and Krambeer proposed to use the orthogonal grating structure of the pixel matrix of a CMOS camera and to evaluate subsections of the image time series that enables 2d2c flow measurements [106].…”

Section: Time Measurementmentioning

confidence: 99%

Optics and Spectroscopy for Fluid Characterization

2018

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Section: Time Measurementmentioning

confidence: 99%

Optics and Spectroscopy for Fluid Characterization

2018

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“…As the readout cycle has to be significantly faster than the movement of the measurement object, sampling rates in the MHz range are required. These can be achieved using CMOS sensors and DSPs for signal processing [ 11 , 12 ].…”

Section: Classical Procedures For Volume Measurementsmentioning

confidence: 99%

An Optical Approach for the Determination of Droplet Volumes in Nanodispensing

Thurow¹,

Krüger²,

Stoll

2009

Journal of Analytical Methods in Chemistry

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This paper looks at the use of drop-on-demand technology in automated life science laboratories. One significant feature of the droplets generated is the enormously high uniformity under constant conditions. However, there is also a relatively strong dependency on environmental conditions. Many different kinds of liquids are used in laboratory applications, some with unknown properties in advance. In light of this and the special way in which the droplets are created, there is one major question which needs answering in relation to the use of this technology in the area of laboratory automation: What is the volume of the drops generated? This paper will present a solution which can be applied in practice. Besides the technical implementation demonstrated, further alternatives will also be presented. Ultimately, dosing systems with greater autonomy should result from the optimizations demonstrated in this paper.

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“…To a certain degree, this loss of signal energy can be compensated for. In time-continuous systems, e.g., sensors with photodiodes, the gain of the signal processing unit can be increased; in time-discrete systems such as CCD sensors, 17 one could alternatively increase the integration time. However, these compensations are not applicable to correct arbitrarily weak image intensities.…”

Section: Luminous Intensitymentioning

confidence: 99%

Design of telecentric imaging systems for noncontact velocity sensors

Berger

2002

Opt. Eng

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Abstract. Optical sensors for noncontact velocity measurement require imaging systems with constant optical magnification in spite of the variable distance between the sensor and the object of measurement. This requirement can be met using telecentric systems. When such systems are set up, several design considerations must be taken into account. These concern the decision as to whether a single or a double telecentric system shall be used, as well as the choice of the optical magnification and the dimensioning of the aperture stop. The results of the theoretical analysis are confirmed by experiments with a prototype velocity sensor for belt drives.

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A novel spatial filtering velocimeter based on a photodetector array

Cited by 10 publications

References 8 publications

Optics and Spectroscopy for Fluid Characterization

Optics and Spectroscopy for Fluid Characterization

An Optical Approach for the Determination of Droplet Volumes in Nanodispensing

Design of telecentric imaging systems for noncontact velocity sensors

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