Campbell CSAT3 Manual de usuario descargar pdf (Pagina 3)

D:\Shared on Tuch\SOP\JHU_SOPsonic_v03.doc - 3 -

The sonic transducers are sealed and will not be damaged should they become wet. The

wind measurements, however, will not be valid because the water droplets, on the face of

the transducer, will scatter the sonic signal. As soon as the transducer faces dry, the

CSAT3 will lock on to the wind signal and begin making measurements.

The CSAT3 will be operated using a SDM (Synchronous Device for Measurements)

communications and a Campbell Scientific CR23X datalogger. The data remains on the

internal datalogger memory and will be downloaded on a daily basis using Campbell

Scientific data communication software package PC208.

3. Data Quality Objectives

Campbell Scientific CSAT3s have been used in numerous field experiments (e.g.

Albertson et al., 1997; Porte-Agel et al., 2000; Pahlow et al., 2001) and prove to be a

reliable tool to obtain information on wind speed and air temperature at high resolution.

The measurements of wind speed and air temperature using the CSAT3 underlie some

limitations. These limitations can be summarized as follows:

- Operating temperature range: -30°C to +50°C

- Speed of sound: 300 to 366 m s

-1

; least significant bit is 1 mm s

-1

- No data can be recorded during rain.

Our objectives for the Baltimore PM Supersite project are:

1. Wind and temperature data at high resolution during intensive measurement periods.

2. Characterize air turbulence transport at the field site in terms of momentum and heat

fluxes. The data will be collected at 10Hz.

Precision:

- rms of u and v is 1.0 mm s

-1

- rms of w is 0.5 mm s

-1

- rms of c is 1.0 mm s

-1

(0.002 °C)

Values are the root mean squared (rms) of instantaneous measurements made of a

constant signal. These values are not affected by the sampling rate.

Accuracy:

Offset error:

u,v: < ±4.0 cm s

-1

w: < ±2.0 cm s

-1

Gain error:

Wind vector within ±5° of horizontal < ±2 percent of reading

Wind vector within ±10° of horizontal < ±3 percent of reading

Wind vector within ±20° of horizontal < ±6 percent of reading

Data completeness: At least 85 percent data completeness (depending on rain/no rain).

Operating range: -30 to +50 °C; wind speeds < 30 m s

-1

; wind angles between ±170°

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