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Device and process for measuring and analysing spectral radiation, in particular for measuring and analysing color characteristics
| Details |
Inventors: Sperling, Uwe;
Assignee: BYK-Gardner GmbH (Geretsried, DE)
Primary Examiner: Font; Frank G.
Assistant Examiner: Ratliff; Reginald A.
Attorney, Agent or Firm: Ohlandt, Greeley, Ruggiero & Perle
A device and process for measuring and analyzing spectral radiation within a desired wavelength range. A number of radiation sources are provided, in combination with a sensor for detecting radiation within the desired wavelength range. The radiation sources are selected to have spectral characteristics that are linearly independent from one another, but overlap so that, in combination, the radiation sources generate radiation over the entire desired wavelength range. Alternatively, a single radiation source generating radiation over the entire desired wavelength range is provided in combination with a plurality of sensors that have spectral sensing characteristics that are linearly independent from one another, but overlap so that, in combination, the sensors sense radiation over the entire desired wavelength range. Further provided is a control unit that stores a number of calibration functions with linearly independent spectral characteristics, the control unit further receiving output values from the sensors to determine the spectral characteristics of the object being measured. |
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DETAILED DESCRIPTION The invention provides a colourimeter which, on the one hand, is simply constructed, but on the other hand is designed in such a way that it is possible to detect the complete spectral distribution of a radiant source.
In contrast to the known devices there is no need for exact and costly filters and no need for expensive grids.
The invention can be realized in different ways, the inventive principle being maintained in all embodiments.
In a first embodiment of the invention the device is designed as an active device.
This means that the device is equipped with at least one radiant source in which electrical energy is converted to radiant energy.
The reflected radiation of a sample to be measured, or, as the case may be, the radiation which passes through the sample is detected by means of sensor apparatus and is is analyzed by means of the control unit.
The assembly of said active device can be executed in different ways.
One of the first preferred embodiments is provided with a number of n radiant sources with different spectral characteristics, whose characteristics are selected in such a way that they overlap, at least partially, and that they are linearly independent of one another.
A sensor which is sensitive to the whole relevant wavelength range of the radiation is provided for detecting the radiation which is either reflected from or passes through the object.
For each individual device a set of standard samples of known reflection characteristics are measured in the relevant wavelength range in order to calibrate the device.
For example, if 8 radiant sources are used which are linearly independent of one another, 8 standard samples are used and their respective known reflection values in predetermined wavelength intervals are entered into the device, i.
e.
for 50 equidistant values in the relevant wavelength range between 380 and 780 nm.
Measurement occurs in sequence, which means that for each individual light source the reflection intensities for all 8 standard samples are measured
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