title: Reflectometer
text: # Reflectometer
  
  Some scientific instruments commonly designated reflectometer are:
  
  * Vector network analyser (VNA)
  * Optical time domain reflectometer
  * Reflectometer (electronics): In electronics, a directional coupler containing matched calibrated detectors in both arms of the auxiliary line, or a pair of single-detector couplers oriented so as to measure the electrical power flowing in both directions in the main line
  * Spectrophotometer: in optics, an instrument for measuring the reflectivity or reflectance of reflecting surfaces
  * Time-domain reflectometer
  