JAI TMC-4200GE User Manual download pdf (Page 79)

Page 67

TM-4200GE Hardware

Operation

FIGURE 66. Pulse Width Control Trigger

9.3.6 Particle Imaging Velocimetry Fixed Exposure Mode

In Particle Imaging Velocimetry (PIV) Fixed Exposure Mode, when an external trigger is applied, the

first time exposure starts the same as PWC mode does. It lasts a very short period (8µs). The second

time exposure starts during the transferring time of the first image accumulated in the first exposure

time. The second time exposure continues until the first image transfers completely. The second image

is transferred after the second exposure. There is a short period (500ns) between the first exposure and

the second exposure. In order to keep two exposure periods constant, the LDV is reset before the first

image is transferred out.

The maximum trigger frequency in this mode is equal to 1/ (transfer time of two frames + 4µs).

The minimum active period of the external trigger is 5μs

FIGURE 67. PIV Exposure Timing Table

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 91 92

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JAI TMC-4200GE User Manual Page 79