Campbell CR10 PROM Instruction Manual download pdf (Page 14)

CSAT3 THREE DIMENSIONAL SONIC ANEMOMETER

FIGURE 8-1. Typical Average CSAT3 Power Requirements at +12 VDC

i + 1

i + 2

i + 3

i - 1

i - 2

i - 1

i + 1

i + 2

i + 1

Trigger

easure Times

Of Flight

Process Data

Output Data

Time

i+1

i+2

i+3

FIGURE 9-1. CSAT3 Pipeline Delay

9. DATA PIPELINE DELAY

When the CSAT3 is triggered to take a

measurement, it determines the times of flight

for all three transducer pairs. This process

takes between 12 to 18 mSec, depending on

the Execution Parameter. After determining the

times of flight, the CSAT3 corrects these times

of flight for transducer delays, and then

calculates the u

, u

, and u

components of the

wind speed. In addition, it corrects each of the

three sonic path speed of sound for the effects

of wind normal to the sonic path. The three

corrected speed of sound values are then

averaged.

All the CSAT3 output signals (SDM, RS-232, and

analog) have the two measurement pipeline delay.

The wind speeds and speed of sound that are sent

to the data acquisition system were measured by

the anemometer two triggers ago (see Figure 9-1).

To optimize system performance, the CSAT3 uses

parallel processing techniques. These techniques

cause a two measurement delay between the

trigger and data output. This delay applies at all

trigger frequencies.

When the covariance is found between the

turbulence data from the CSAT3 and temperature

from a fine wire thermocouple or a fast response

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