| This sensor head couples a high-performance photopic sensor (based on the Model 211) with a special fixture to measure the averaged luminous intensity of LEDs according to the recommendations of CIE Publication 127 (illustrated above; LED Sockets sold separately). The intensity fixture precisely sets the distance and alignment between the LED and the sensor‚ so that measurement accuracy and repeatability are ensured. The system can easily be configured for either of the CIE-prescribed geometries: Condition A or Condition B. Measurement results are expressed in units of candela (cd). The sensor is calibrated over the visible spectral range‚ so that the nominal peak wavelength of the device under test can be selected during measurement‚ ensuring maximum possible measurement accuracy. |
