Patent ID: 9746418
Date: 2017-08-29
CPC Classifications: G01M,G01N

Claim:
1. A portable reflectometer for the spectral measurement of the specular reflection of mirrors of solar collectors, the portable reflectometer comprising: a module that carries out the measurement of the coefficient of the reflection of the mirror with at least a plurality of light emitting diodes as optical sources and a plurality of reflection photodetectors, one reflection photodetector respectively for each of the plurality of light emitting diodes; a respective diaphragm for each of the plurality of light emitting diodes, each respective diaphragm having a diameter and a length larger than an aperture of the diaphragm, wherein each diaphragm limits, in size and aperture, the output light beam of the respective light emitting diode that is incident on the mirror, to ensure the size of the area illuminated on the mirror surface, thus limiting the contribution of diffuse reflection in the measurement, and wherein each of the plurality of reflection photodetectors is positioned to receive the respective output light beam after the output light beam has specularly reflected from the mirror; an electronic system for acquiring and processing signals comprising a synchronous, analogical or digital detection, an analog-to-digital converter, an electronic modulation generator or a microprocessor configured to modulate the emission of light by each of the plurality of light emitting diodes to a respective measurement frequency, and a digital or analog electronic filter that filters the signals received from the respective reflection photodetectors to filter out frequency components except for the respective measurement frequency, the electronic system obtaining values for the reflectance of the mirror at specific light wavelengths; a data processing and equipment control system that provides global reflectance values by weighting the obtained values with weights according to their respective wavelengths in the solar spectrum; a system for storing relevant data; a user interface system; a system for the communication between the above systems; and an exterior casing.