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====== Tunable Diode Laser Hygrometer (TDL) ======
  * Description: Laser Hygrometer
  * Manafacturer: Maycomm Research Company
  * Model Number: AC19-400
  * UND Tag Number:  103510
  * Calibration Mixing Ratio Equations:
    * TDL mixing ratios ≥ 4801.7 ppmv: w = 10^{1.2649*(log<sub>10</sub>(w<sub>TDL</sub>))<sup>2</sup>-7.8797*log<sub>10</sub>(w<sub>TDL</sub>)+15.6}
    * TDL mixing ratios < 4801.7 ppmv: w = 10^{1.049*log<sub>10</sub>(w<sub>TDL</sub>)-0.1273}
    *Calibration was done on Dec. 2, 2008 at NCAR
    *Calibration excel sheet is found under /nas/und/Documentation/ directory.
  * Calibration Pressure Equation: slope: 0.9881  offset: 11.4694
    *Calibration was done on March 11, 2009 at UND
    *Calibration excel sheet is found under /nas/und/Documentation/ directory.

===== Problems =====

  * [[iop1]]
  * [[atmos:citation:instruments:tdl:mpace:home|mpace]]
  * [[sikorsky]]
  * [[2005_summer]]
  * [[2006_spring]]
  * Febuary 26, 2011 Getting poor air sampling quality. Moved the TDL to the back left rack to shorten up air sampling length. 
  * [[2015_leak]]

===== Blog =====
  * 140524 - Cleaned the TDL. 
  * 140524 - Switched the Intake and Exit lines on the fuselage ports.
  * 151013 - Cleaned the TDL.
  * 151109 - Cleaned the TDL.

===== Procedures =====
  * [[tdl_inlet|Inlet]]
  * [[tdl_cleaning|Cleaning Procedure]]
  * [[tdl_laptop_comm|Laptop Communications]]