Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Reexamination Certificate
1999-01-25
2001-03-20
Noori, Max (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
Reexamination Certificate
active
06202493
ABSTRACT:
TECHNICAL FIELD
The present invention relates to methods for determining at least a first parameter of an object, apparatus for determining at least a first parameter of an object, methods for determining a first parameter which is a function of at least one parameter selected from the group consisting of the diameter of a yarn, the diameter of a fibrous object, the colour of a fibrous object and the colour of a yarn, and apparatus for determining at least a first parameter which is a function of at least one parameter selected from the group consisting of the diameter of a yarn, the diameter of a fibrous object, the colour of a fibrous object and the colour of a yarn.
BACKGROUND ART
There is a need for a method and apparatus which can detect faults, contamination and/or variations in objects especially in fibres or yarns.
OBJECTS OF THE INVENTION
Objects of the present invention are to provide methods for determining at least a first parameter of an object, apparatus for determining at least a first parameter of an object, methods for determining at least a first parameter which is a function of at least one parameter selected from the group consisting of the diameter of a yarn, the diameter of a fibrous object, the colour of a fibrous object and the colour of a yarn, and apparatus for determining at least a first parameter which is a function of at least one parameter selected from the group consisting of the diameter of a yarn, the diameter of a fibrous object, the colour of a fibrous object and the colour of a yarn.
DISCLOSURE OF THE INVENTION
According to a first embodiment of this invention there is provided a method for determining at least a first measurement parameter of an object, comprising:
(a) locating the object in a measurement interaction volume having a light absorbing background;
(b) passing a measurement light beam through the measurement interaction volume, said measurement light beam comprising at least two spectrally different wavelengths of light;
(c) interacting the measurement light beam with the object to produce measurement outgoing light;
(d) filtering the measurement outgoing light from the measurement interaction volume into at least two measurement spectrally different outgoing light portions;
(e) detecting the at least two measurement spectrally different outgoing light portions and generating signals therefrom whereby the signals are a function of the at least first parameter; and
(f) determining the at least first parameter from the signals.
Step (a) may be performed before, at the same time or after step (b).
Typically the light absorbing background is a black background which may be a flat matt black background.
Typically the object is selected from the group consisting of a yarn and a fibrous object, wherein:
step (a) comprises locating the object in a measurement interaction volume having a light absorbing background which is a black background;
step (c) comprises interacting the measurement light beam with the object to produce measurement outgoing light reflected from the object; and
step (d) comprises filtering the reflected measurement outgoing light from the measurement interaction volume into at least two measurement spectrally different outgoing light portions.
Alternatively:
step (d) comprises filtering at least two different portions of the measurement outgoing light into at least two spectrally different wavelength bands;
step (e) comprises detecting the at least two measurement spectrally different wavelength bands, each band being detected by a different detector at the same time or at different times or by the same detector at different times, and generating signals therefrom whereby the signals are a function of the at least first parameter.
In another alternative:
step (d) comprises filtering at least two different portions of the measurement outgoing light into at least two spectrally different wavelength bands; and
step (e) comprises detecting the at least two measurement spectrally different wavelength bands, each band being detected by a different detector at the same time or at different times or by the same detector at different times, and generating signals therefrom whereby the signals are a function of the first parameter.
Advantageously:
step (a) comprises locating the object in a measurement interaction volume having a light absorbing background.
The filtering is typically selected from the group consisting of spectral filtering and temporal filtering.
The method of the invention may further comprise:
(g) outputting at least a first parameter signal which is a function of the at least first parameter.
In one form of the invention:
step (e) comprises detecting at least two measurement spectrally different outgoing light portions and generating signals therefrom which are related to the respective intensities of the at least two measurement spectrally different outgoing light portions whereby the signals are a function of the at least first parameter; and
step (f) comprises determining the at least first parameter from the signals by comparing the signals with reference signals or reference values. The method of the invention may further comprise:
(f′) determining from the at least first parameter whether the object is an acceptable object or an unacceptable object.
According to a further embodiment of this invention there is provided a method for determining at least a first parameter of an object, comprising:
(a) locating the object in a measurement interaction volume having a light absorbing background;
(b) passing a measurement light beam through the measurement interaction volume;
(c) interacting the measurement light beam with the object to produce measurement outgoing light;
(d) filtering the measurement outgoing light from the measurement interaction volume into at least two measurement spectrally different outgoing light portions;
(e) detecting the at least two measurement spectrally different outgoing light portions and generating signals therefrom whereby the signals are a function of the at least first parameter; and
(f) determining the at least first parameter from the signals.
Step (a) can be performed before, at the same time or after step (b).
According to another embodiment of this invention there is provided a method for determining at least a first parameter which is a function of at least one parameter selected from the group consisting of the diameter of a yarn, the diameter of a fibrous object, the colour of a fibrous object and the colour of a yarn, comprising:
(a) locating the fibre in a measurement interaction volume having a black light absorbing background;
(b) passing a measurement light beam through the measurement interaction volume;
(c) interacting the measurement light beam with the object to produce measurement outgoing light reflected from the fibre;
(d) filtering the reflected measurement outgoing light from the measurement interaction volume into at least two measurement spectrally different outgoing light portions;
(e) detecting the at least two measurement spectrally different outgoing light portions and generating signals therefrom whereby the signals are a function of at least one parameter selected from the group consisting of the diameter of the fibre and the colour of the fibre; and (f) determining from the signals at least a first parameter which is a function of the at least one parameter.
This embodiment may further include:
(g) outputting at least a first parameter signal which is a function of the at least first parameter.
According to another embodiment of this invention there is provided a method for determining at least a first parameter of an object, comprising:
(a) locating the object in a measurement interaction volume having a light absorbing background;
(b) passing a measurement light beam through the measurement interaction volume;
(c) interacting the measurement light beam with the object to produce measurement outgoing light;
(d) detecting the measurement outgoing light from the measurement interaction volume and generating at least two different meas
Caffin Roger Neil
Cantrall Christopher Joseph
Higgerson Graham John
Holcombe Barry Victor
Humphries William
Commonwealth Scientific and Industrial Research Organisation
Noori Max
Pillsbury Madison & Sutro LLP
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