Correcting Dew Point Measurements for Pressure
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1 Background Correcting Dew Point Measurements for Pressure RAF Algorithm Review 10/12/2011
2 Background WHY MEASURE HOUSING PRESSURE? The Housing Chilled mirror inside Note small hole Accelerated air ow around nose and housing
3 Background WHY MEASURE HOUSING PRESSURE? The Housing Chilled mirror inside Note small hole Accelerated air ow around nose and housing Dew Point De nition: Temperature at which ambient vapor pressure is in equilibrium w/ water
4 Background WHY MEASURE HOUSING PRESSURE? The Housing Chilled mirror inside Note small hole Accelerated air ow around nose and housing Dew Point De nition: Temperature at which ambient vapor pressure is in equilibrium w/ water Vapor pressure change: proportional to total pressure
5 Background SENSITIVITY TO PRESSURE Vapor Pressure at Equilibrium Change in vapor pressure of -50% or +100%: near 0 C, dew point changes by approx. 10 C near -50 C, dew point changes by approx. 6 C 1 C error in dewpoint for 8% change in vapor DP = 0 C; for 12% T DP = 50 C. ±10% errors are signicant
6 Background HOW LARGE IS THE PRESSURE DEVIATION?
7 Background HOW LARGE IS THE PRESSURE DEVIATION? PSXC (yellow) compared to PSDP{R,L} (cyan, green) - Note ca. 100 mb dierence at max altitude
8 Background HOW LARGE IS THE PRESSURE DEVIATION? Extreme deviations run up to 180 mb, with a pressure decit at high altitude.
9 Background HOW LARGE IS THE PRESSURE DEVIATION? Pressure correction will increase the dew point. Comparison with VCSEL (cyan trace) is already fairly good, may get worse?
10
11 Note valleys, L only
12 Background ALGORITHM WHEN PSDPx IS AVAILABLE Modied DPXC 1 Obtain vapor pressure from measured DPx 2 Correct for enhancement factor 3 Scale vapor pressure by F={PSXC}/{PSDPx} 4 Get DPXC via interpolation table, e to DPXC Available since DC3-TEST, May 2011 Includes HIPPO-4, HIPPO-5, ICEBRIDGE
13 Background ALGORITHM WHEN PSDPx IS AVAILABLE Modied DPXC 1 Obtain vapor pressure from measured DPx 2 Correct for enhancement factor 3 Scale vapor pressure by F={PSXC}/{PSDPx} 4 Get DPXC via interpolation table, e to DPXC Available since DC3-TEST, May 2011 Includes HIPPO-4, HIPPO-5, ICEBRIDGE
14 OLD DATA Background Are Errors Important? Errors Errors range from slightly high to 6C too low
15 OLD DATA Background Are Errors Important? Errors Errors range from slightly high to 6C too low Plateau at low DP is moved from around -70C to around -65C
16 OLD DATA Background Are Errors Important? Errors Errors range from slightly high to 6C too low Plateau at low DP is moved from around -70C to around -65C Where VCSEL measures about -80C, DP now is between -60C and -65C
17 Background POSSIBLE CORRECTION PROCEDURE Find which aspects of ight conditions determine the pressure decit Possible dependence on PSXC, Mach No, TAS, QCRC, ATTACK, SSLIP.
18 Background POSSIBLE CORRECTION PROCEDURE Find which aspects of ight conditions determine the pressure decit From exploring these possibilities, found PSXC, XMACH2, QCRC seem to be best Possible dependence on PSXC, Mach No, TAS, QCRC, ATTACK, SSLIP. Best t, for PSDPL: P DP = P a a(a 0 + a 1 p + a 2 M 2 )
19 Background POSSIBLE CORRECTION PROCEDURE Find which aspects of ight conditions determine the pressure decit From exploring these possibilities, found PSXC, XMACH2, QCRC seem to be best Fit determined for HIPPO-4 RF01. (Coecients in memo) Possible dependence on PSXC, Mach No, TAS, QCRC, ATTACK, SSLIP. Best t, for PSDPL: P DP = P a a(a 0 + a 1 p + a 2 M 2 ) Test: apply to DC3-TEST (RF03), dierent project and dierent ight prole
20 FIT RESULTS Background Black Line: Measured PSDPL Thin red line: Results of t Fit RMS: 7.9 mb
21 Background APPLICATION TO A DIFFERENT FLIGHT
22 CONCLUSIONS Background : 1 Add processing to include the eect of the measured pressure, as follows: 1 Calculate the pressure ratio PSXC/PSDPx =Rx 2 Multiply the vapor pressure by Rx after converting from measured dew point to vapor pressure. 3 Use this modied vapor pressure as the output variable EDPC. 4 Use the interpolation table to nd the dew point temperature.
23 CONCLUSIONS Background : 1 Add processing to include the eect of the measured pressure, as follows: 1 Calculate the pressure ratio PSXC/PSDPx =Rx 2 Multiply the vapor pressure by Rx after converting from measured dew point to vapor pressure. 3 Use this modied vapor pressure as the output variable EDPC. 4 Use the interpolation table to nd the dew point temperature. 2 For old GV data, consider reprocessing with the pressure determined from (1) to correct for rather large errors in the dew point measurements, which can be 5-10 C.
24 CONCLUSIONS Background : 1 Add processing to include the eect of the measured pressure, as follows: 1 Calculate the pressure ratio PSXC/PSDPx =Rx 2 Multiply the vapor pressure by Rx after converting from measured dew point to vapor pressure. 3 Use this modied vapor pressure as the output variable EDPC. 4 Use the interpolation table to nd the dew point temperature. 2 For old GV data, consider reprocessing with the pressure determined from (1) to correct for rather large errors in the dew point measurements, which can be 5-10 C. 3 Change the long_name of DPLC and DPRC to distinguish them from DPLS/DPRS.
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