---
name: "gpiv_trig"
section: "1"
platform: "linux"
package: "gpivtools"
version: "0.6.0-3.1"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/gpiv_trig"
---

# gpiv\_trig(1)

triggers a (double Nd\_YAGG) laser with a CCD camera.

## NAME

gpiv\_trig - triggers a (double Nd\_YAGG) laser with a CCD camera.

## SYNOPSIS

**gpiv\_trig**  \[**-h** \| **--help**\] \[**-i** \| **--interactive**\] \[**-v** \| **--version**\]   \[**-V** \| **--verbose**\]

## DESCRIPTION

**gpiv\_trig triggers a CCD camera and a (double Nd\_YAGG) laser for** **Particle Image velocimetry (PIV). The code uses a kernel module** **gpivtrig\_rtl from the gpivtrig package that depends on the Real Time** **Application Interface (RTAI) and RealtimeLinux. Trigger pulses are** **send to the parallel port of the PC (/dev/lpt0 or /dev/lpt1; see the** **configure script of the gpivtrig package) at bins #1 (camera),**  **#2 and #3 (first and second laser respectively). The program may be** **started directly if all modules have been loaded or by the** **gpiv\_control script, also included in the gpivtrig package,  which** **takes care of the loading and unloading of the needed kernel** **modules. Currently, gpiv\_trig is tested with RTAI-3.1 and the** **linux kernel-2.4.27.**

**This program uses the TRIG** parameters. The command line options are explained below.

## Options

- **-h** \| **--help**

  On-line help.

- **-i** \| **--interactive**

  Prompt for confirmation.

- **-v** \| **--version**

  Print version information on standard output, then exit successfully.

- **-V** \| **--verbose**

  program behaves more verbose during operation showing what is going on

## SEE ALSO

[gpivtools(1)](/gpivtools/1.md), gpiv\_control(1), [gpiv(1)](/gpiv/1.md)

## AUTHOR

Gerber Van der Graaf