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Large Aperture Scintillometer (LAS). Operational procedure at micromet -KCL Version 4 – Strand Roof Mariana L. Gouvea September 2009. Instrument. Settings Current adjust at transmitter back panel adjusted to 400 mA

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large aperture scintillometer las

Large Aperture Scintillometer (LAS)

Operational procedure at micromet-KCL

Version 4 – Strand Roof

Mariana L. Gouvea

September 2009

slide2

Instrument

  • Settings
  • Current adjust at transmitter back panel adjusted to 400 mA
  • Path length potentiometer setting at receiver back panel set to 470 – given by equation 1a, page 24 of the LAS manual – NOT equal to the distance in meters!

KCL - Receiver

808 m

JCM - Transmitter

Location

  • Alignment
  • Move vertically and horizontally until maximum signal (at receiver back panel)
  • Repeat procedure at both ends (transmitter and receiver)
  • Important: Do NOT align using only the telescopes!
  • More detailed instructions in the instrument’s manual – page 20.

1

slide3

(Sue’s office)

Instrument

Datalogger

(Strand roof – right)

LAS

CR1000

Roof 6

Otago

(see wiring diagram)

LoggerNet(see setup)

StrandLogger_V3.CR1

Fast files: 10 Hz data

C:\LAS_data\CR1000_LASfast.dat

Scheduled task: HourlySplit_LASstrand_v2

(run every 04 minutes past the hour)

Scheduled task: GAS-LAS-WXT-Ceil

(run every 10 minutes past the hour)

Hourly files: 10 Hz data

SPLIT

SPLIT

H:\RawData\London\KCLroof\YYYY\LAS\Hourly\

LasFastYYDDD_HH.txt

GRAB HOURLY FILES

C:\LAS_outdata\LasFastYYDDD_HH.txt

Slow files: 15 min averaged data

C:\LAS_data\CR1000_LAS.dat

Scheduled task: DailySplit_LASstrand_v2

(run every day at 00:03 h)

Scheduled task: LASDailyPlot

(run every day at 02:24 h)

Daily files: 15 min averaged data

H:\RawData\London\KCLroof\YYYY\LAS\Daily\

las_YYDDD.dat

C:\LAS_outdata\las_YYDDD.txt

External files

  • H:\RawData\London\KCLroof\
  • WXT510\MM\LRYYYYDD_15.txt
  • KCL_params_v0.txt

GRAB DAILY FILES and DATA PROCESSING (DAILY PLOT)

Processed data files:

Plots:

H:\RawData\London\KCLroof\YYYY\LAS\plots\

H:\RawData\London\KCLroof\YYYY\LAS\flux\

  • LASplot_DDD.jpg
  • LASplotH_DDD.jpg
  • LASmod_DDD.jpg
  • LASplotU_DDD.jpg
  • LASflux_YYDDD.txt
  • LASflux_YYDDD_15.txt
slide4

Wiring

YELLOW

GREEN

GROUND

RED

Specification from LAS manual

IN (from LAS)

OUT (to datalogger)

H

H

L

L

Orange

Yellow

Green

Green

Power 12V DC

- Violet

Channel 7

Channel 8

Brown

Red

Power GND

- Blue

Cable extension

Orange

High

Diff channel 1

Brown

High

Diff channel 2

Cn2

Demod

Green

Low

Diff channel 1 *

x

Low

Diff channel 2 *

* Must be connected with small wire (Both signals common signal ground)

Violet

Black

Blue

Blue

Wire connection to channels 7 and 8

BLACK

BLUE

12V

GND

slide5

Datalogger program: StrandLogger_LAS_V2.CR5

'CR5000

'Strand roof logger

'Program for LAS data - to be combined with other instruments

'Created by Mariana Gouvea 02/04/2009 - based on HutLogger_V1.CR3

'Constants **************************************************

Const scan_interval = 100 '100 mSec

'Declare Variables and Units ************************************

Public UCn2

Public DEMOD

Units UCn2 = V

Units DEMOD = mV

Dim PUCn2

Units PUCn2 = m-2/3

'Define Data Tables *******************************************

'LAS slow: sample rate 10 Hz, average period 15 min

DataTable(LAS,true,-1)

DataInterval (0,15,min,10)

Average(1,UCn2,IEEE4,0)

StdDev(1,UCn2,IEEE4,0)

Average(1,Demod,IEEE4,0)

StdDev(1,Demod,IEEE4,0)

Average(1,PUCn2,IEEE4,0)

EndTable

'LAS fast: raw data table

DataTable (fast,true,-1)

Sample(1,UCn2,IEEE4)

Sample(1,Demod,IEEE4)

EndTable

'Main Program **********************************************

BeginProg

Scan (scan_interval,mSec,1,0)

VoltDiff (UCn2,1,mV5000,19,true,0,250,0.001,0)'mV to V

VoltDiff (Demod,1,mV5000,20,true,0,250,1.0,0)

PUCn2 = (10^UCn2)*1000

CallTable fast

CallTable LAS

NextScan

EndProg

slide6

PakBus Nodes

Data Files

LoggerNet setup:

Hardware

Schedule

Hardware

Hardware

Standard:

Y Communication enabled

ComPort connection: COM4

Advanced:

N Call-back enabled

Extra response time: 00s

Delay hangup: 00s

ComPort communication delay: 00s

PakBus Port

COM4

CR3000

Empty

Standard:

Y Communication enabled

NPakBus port always open

Maximum time online: 00h 00m 00s

Maximum baud rate: 115200

Beacon interval: 00h 00m 00s

Advanced:

Extra response time: 00s

Delay hangup: 00s

Attention to file format!

Standard:

Y Communication enabled

Y Call-back enabled

PakBus address: 1

Base: Date: 29/01/2009 Time: 00:01:01

Advanced:

Maximum packet size: 1000

Security code: 0

Delay hangup: 00s

N Enabled automatic hole collection

Collection interval: 0d 00h 6m 00s

Primary retry: 0d 00h 2m 00s

Number of primary retries: 3

Y Secondary retry interval: 0d 00h 15m 00s

Y Scheduled connection enabled

When the server’s table definition are invalid: Automatically reset changed tables

* Seconds: Y for fast files, N for slow files

Y Included for scheduled collection

Table:

Fast

LAS

Output file name:

C:\LAS_data\CR3000_Fast.dat

C:\LAS_data\CR3000_LAS.dat

N Include array ID

Timestamp options:

Y Year; Y Day; Y Hour/minutes;

N/Y Seconds*; N Midnight is 2400

Max and Min timestamp options:

N TOA format

Y Array datalogger format hour/minutes and seconds

N Use default file name

File output option: Append to file

Output format: Array compatible CSV

Collect mode:

Y Data logged since last collection

Y Collect all on first collection

N Most recently logged records

Clock

Program

Time zone offset: 00h 00m

StrandLogger_V3.CR1

Automated clock check:

Y Enabled

Initial date: 01/01/1990

Initial time: 01:15:00

Interval: 0d 00h 05m

Allowed clock deviation: 00s

slide7

Parameters file: KCL_params_v0.txt

% Constants:

%

0.4 %1 k = Von Karman constant

9.8 %2 g = gravity acceleration (m s-2)

287 %3 R = gas constant (J kg-1 K-1)

7.9E-7 %4 gama = cte in Ct2 equation (K Pa-1)

4.9 %5 cu1

6.1 %6 cu2

4.9 %7 cs1

2.2 %8 cs2

%

%

% Parameters:

1.0 %9 z0 = roughness legth

27.0 %10 zl = LAS height

18.0 %11 dl = LAS displacement height

48.1 %12 zu = height of wind measurements

Weightening function

Strand roof (receiver)

JCMB (transmitter)

slide8

Daily Plot Troubleshooting

1. Otago:

1.1. Check files

  • Check if files exist, if they are in the correct directories and if they have the correct format

1.2. Check scheduled tasks

  • Run scheduled task again
  • If MATLAB error: try and track problem or contact responsible person
  • Check schedule (if set up to run at correct time)

OBS: Daily plot should not stop due to missing files, but generate blank plots.

2. Roof 6:

2.1. Check files

  • Check if files exist, if they are in the correct directories and if they have the correct format

2.2. Check scheduled tasks (splitting)

  • Run scheduled task again
  • Check schedule (if set up to run at correct time)

2.3. Check LoggerNet setup

  • Attention to download schedule
  • Attention to output files naming and format
slide9

File formats

(from datalogger – before splitting)

Slow files: 15 min averaged data

File name structure: CR1000_LAS.dat

Generated by: datalogger

Fast files: 10 Hz data

File name structure: CR1000_LASfast.dat

Generated by: datalogger

slide10

File formats

(raw data after splitting)

Hourly files: 10 Hz data

File convention for data files stored in: H:\RawData\London\KCLstrand\YYYY\LAS\Hourly

File name structure: LasFastYYDDD_HH.dat

File convention started: 15:00 DOY 311 2008

(check for previous format from 23:00 DOY 199/2007)

Generated by: HourlySplit_LASstrand_v2

Daily files: 15 min averaged data

File convention for data files stored in: H:\RawData\London\KCLstrand\YYYY\LAS\Daily

File name structure: las_YYDDD.txt

File convention started: 22/09/2009

Generated by: DailySplit_LASstrand_v2