5MH BSL process & timing

Five Mile Hill back scatter lidar system is operated during HiRes1 runtime, which means only in Clear Moonless Night. The laser tower top cover and the building door will be controlled by HiRes1 operators. The operation process for HiRes1 Steerable Laser System will start and stop by HiRes1 operators, and the operation processes for HiRes1 Back Scatter Receiver System will start and stop automatically as cron job.

5MH BSL receiver process flow-chart

loop day
{
    start process0 (main)
    start process1 (timing check)
    ( manually start process2 (command prompt) )

    loop time check
    {
        if(runtime)
        {
            noise check

            if(beginning of runtime) LED flash

            loop hour
            {
                loop laser direction
                {
                    laser shot
                }
                check the newest data
            }
        }
    }

    noise check
    stop process0
    stop process1
    ( manually stop command prompt(process2) )

    compress data
}

start process0 (hr1bsl)
{
    set HV to 0V
    check all status
    open communication port as server
    open today's data file "yYYYYmMMdDDpXX.hr1bsl.dat"
}
return

start process1 (hr1bsl_client1)
{
    open communication port as client
    check runtime table
    check time
}
return

start process2 (hr1bsl_client2)
{
    open communication port as client
    show command prompt
}
return

noise check
{
    set osillo
    set HV
    trigger force for 10 events
    record oscillo waveform data
}
return

LED flash
{
    set osillo
    set HV
    flash UV LED for 100 events
    record oscillo waveform data
}
return

laser direction
{
    receive laser direction data from hr1sls
    receive laser #shot     data from hr1sls
    set osillo
    set HV
    wait for the bunch of laser shots
}
return

laser shot
{
    receive laser trigger pulse
    record time by hr1lidar CPU clock
    record oscillo waveform data for #shot
}
return

stop process0 (hr1bsl)
{
    set HV to 0V
    check all status
    close today's data file "yYYYYmMMdDDpXX.hr1bsl.dat"
}
return

5MH BSL receiver process timing

00:01(UT)           start (hr1bsl) process   (main program)
00:02(UT)           start (hr1bslc1) process (timing check program)

                    set HV to GND for every minit...

01:00(UT)           repeat timer switch(for HV AC) ON

-------------------------------------------------------------------
StartTime - 01:00   HiRes1 Operators put HV/Light switch down
                    (HV Enable)

                    HV AC swiches show Red LED light...

StartTime - 00:30   (hr1bslc1) send "ini_hr1bsl" to (hr1bsl)
                    (Initialize)
                    (If failed, maximum trial period is 3 min.
                     and after that, disable to flash LED)

                    wait 5 min. for HV to stabilize.

StartTime - 00:25   Flash UV LED for 100 shots (<45 sec.)

StartTime - 00:20   (hr1sls) bsl_diag
                    (hal) Noise, YAG

StartTime           open Building-22 Door
                    (hal) Noise_Open, YAG_Open
                    (hr1sls) run
-------------------------------------------------------------------
HH:00(UT)           (hr1sls) start shooting with "lidar_loop.dat"
                             shooting patern

HH:30-40(UT)        (hr1sls) shoot laser toward bsl FOV.
                    (hr1bsl) receive laser direction data,
                             data taking(#shot, #rate)

HH:45(UT)           check the newest data and plot
-------------------------------------------------------------------

EndTime - 00:10     (hr1bslc1) send "cls_hr1bsl" to (hr1bsl)
                    (Close procesure)
                    (hr1sls) stop, shutdown

EndTime - 00:05     (hal) Noise_Open, YAG_Open

EndTime             close Building-22 Door
                    (hal) Noise, YAG

EndTime + 00:30     HiRes1 Operators put HV/Light switch middle
                    (HV Disable)
                    HV AC swiches show No red LED light.
-------------------------------------------------------------------

14:00(UT)           kill (hr1bslc1) process if it's still running
14:01(UT)           kill (hr1bsl)   process if it's still running
14:02(UT)           set HV to Ground level  if it's still On

19:00(UT)           rename log file
19:01(UT)           compress data file