Spectrophotometer for the characterisation of receivers of solar collectors

A spectrophotometer for the characterization of receivers of solar collectors, each of the receivers having an inner tube and an outer tube, the spectrophotometer comprising:

• a measurement module adapted to measure a reflection coefficient and a transmission coefficient of the receiver, the measurement module comprising:
• a transmittance measurement device configured to measure a transmission coefficient of the outer tube, the transmittance measurement device comprising:
• a first light emitting source adapted to measuring a transmittance, said light emitting source configured to transmit a first radiation, the first radiation being infrared, the light emitting source being oriented such that the outer tube is traversed by the first radiation without intercepting the inner tube so as to produce a first transmitted radiation;
• a first light detector adapted to measure the transmission of the first radiation over an infrared spectrum;
• a second light emitting source that transmits visible and ultraviolet radiation;
• and
• a second light detector that measures the transmission of the visible and ultraviolet radiation over a visible and ultraviolet spectrum, the first and second light emitting sources being aligned with a chord of the receiver and focused on a first end of the chord, the first end being located on the outer tube, the first and second light detectors being aligned with the chord focused on a second end of the chord, the second end being located on the outer tube and opposite the first end;
• a reflectance measurement device adapted to measure the reflection coefficient of the inner tube, said reflectance measurement device comprising:
• a first light emitting source that measures reflectance, said emitting source emitting a second radiation to the inner tube and oriented such that the inner tube is intercepted by the second radiation so as to produce a reflected radiation, the second radiation being infrared radiation;
• a first light detector that measures the reflectance of the infrared radiation over an infrared spectrum;
• a second light emitting source that emits visible and ultraviolet radiation;
• and
• a second light detector that measure the reflectance of visible and ultraviolet radiation over a visible and ultraviolet spectrum, the first and second light emitting sources being contained in a longitudinal plane of the receiver and focused on a generatrix in the outer tube, the first and second light detectors being contained in the longitudinal plane and focused on the generatrix in the outer tube;
• a concentricity detection module adapted to detect a concentricity or a non-concentricity between the inner tube and the outer tube, the concentricity detection module comprising:
• an emitting source having a light emitter that detects the concentricity or non-concentricity and configured to emit a third radiation so that the outer tube is traversed by the third radiation without intercepting the inner tube so as to produce a second transmitted radiation;
• and
• an array of detectors configured to receive the second transmitted radiation.