Microwave-modulated photon doppler velocimetry
Date of Original Version
Photon Doppler velocimetry (PDV) has become an important technique for explosives diagnostics over the last two decades. However, the inherent necessity for a very highspeed digitizer has rendered this technology expensive and inaccessible to the general research community. This letter reports a microwave-modulated PDV method, based on the conventional PDV testing, in which an RF modulator was used to directly modulate the current of a laser transmitter. Carrying the modulated frequency, the received PDV beat frequency was then engaged with a second beat frequency at the photo receiver, resulting in a low detection frequency. This resulting frequency can be detected using a digitizer with a lower sampling rate while retaining the information necessary for high-speed velocimetry measurement.
IEEE Photonics Technology Letters
Chen, Zhen, Ryan Rettinger, Gerald Hefferman, James Smith, Jimmie Oxley, and Tao Wei. "Microwave-modulated photon doppler velocimetry." IEEE Photonics Technology Letters 28, 3 (2016): 327-330. doi:10.1109/LPT.2015.2495332.