Light attenuation in a semitransparent foam sheet—Thickness measurement for industrial use

Ueda, Masahiro; Mizuno, Sanae; Matsumura, Akio; Tohjyo, Fumio

doi:10.1016/0143-8166(95)00015-1

Cited by 7 publications

(2 citation statements)

References 2 publications

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“…The production speed of glass wool is about 8 m/min and then each data on the monitor is the averaged value for an area of 230 mm x 270 mm. Lambert's law,2 which shows a relation between input and output light intensity, /0//i, can be expressed as follows: /0//i = exp(-kD) or ln(/0//i) = -kD (1) where D is the glass wool density of the corresponding area and k the absorption coefficient which depends on a property of the material. Thus, a natural logarithms of the light intensity ratio is in directly proportional to the density.…”

Section: Principle and Methodsmentioning

confidence: 99%

Realtime densitometer for glass wool using solar cells

Chen¹,

Ueda²,

Asada

et al. 1998

Optics and Lasers in Engineering

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An optical method to measure the weight density of raw glass wool has been developed for use in a manufacturing plant. The method is based on the light attenuation theory. The system consists of the usual white light as a light source, a solar cell as a light-sensitive receiver, an amplifier, a personal computer with an A/D converter for data acquisition and a monitor for display of the data. The accuracy of the system was found to be above 98% and the system can be effectively applied to practical use in the factory. The system may be further applied for quality control in manufacturing raw glass wool.

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Section: Principle and Methodsmentioning

confidence: 99%

Realtime densitometer for glass wool using solar cells

Chen¹,

Ueda²,

Asada

et al. 1998

Optics and Lasers in Engineering

Self Cite

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show abstract

“…The same principle that is used by the Kinotex TM sensor has been used in industrial processes to accurately measure foam thickness [157]. When light shines through a uniform foam medium, the intensity of light that is transmitted through the medium can be expressed by Lambert's Law:…”

Section: Characterization Of Non-uniform Sensor Array Responsementioning

confidence: 99%

Robust Ambient Multisensor Signal Fusion Towards Clinical Data Analytics

Holtzman¹

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As ambient systems proliferate, there is an increased need for data-level fusion methods that reflect the challenges of unknown environments, non-deterministic signal behaviours, and movement artifact. Cushioning between the sensor and bed occupant decreases signal to noise power and signal availability, while non-linear signals can masquerade as delayed and reversed signals. The main contributions of this thesis are to study how these challenges affect extraction of a breathing signal from bed-based sensors and to propose more robust fusion techniques.New trend analysis methods effectively corrected polarity reversals, increasing the number of good quality signals by 9% and reducing mean respiratory rate error by 24%. To fuse these signals, selection combining, weighted summation, and blind source separation methods were innovated and compared. None performed best all of the time; some were generally good with some weaknesses, while others had specialized strengths. Contextual ensemble fusion selected the best fusion method in degraded conditions in 55% of records, compared to 36% for the top individual fusion method, providing clinical applications with more reliable data. While sleep medicine is an important application, ambient monitoring is also suited to cognitive medicine and palliative care. Developed methods were applied to monitor patients in palliative care, marking the first long-term, continuous monitoring of this population. Breathing patterns observed in the last weeks of life included Cheyne-Stokes respiration and tachypnea, while breathing variability was associated with survival time.ii

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On the Attenuation of Light by a Polydimethylsiloxane (PDMS) Foam and Its Implementation as a Weight Sensor

Tamhane

Morarka

2016

MAPAN

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Light attenuation in a semitransparent foam sheet—Thickness measurement for industrial use

Cited by 7 publications

References 2 publications

Realtime densitometer for glass wool using solar cells

Realtime densitometer for glass wool using solar cells

Robust Ambient Multisensor Signal Fusion Towards Clinical Data Analytics

On the Attenuation of Light by a Polydimethylsiloxane (PDMS) Foam and Its Implementation as a Weight Sensor

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