Burst Measurement

[camille0190]

Modulate Burst Detection with very low SNR < 32 dB.

Burst period = 100 ns
Frequency modulation 10 ns.
period between 2 burst 1 ms.

The system must detect this burst specified up and generate a TTL signal synchronised to time detection.

Thank you for your help

[Ben]

I am not sure what your question is!

Check out NI's high end scope cards. They may be able to handle this using hardware triggering.

Please elaborate if I am out in left field.

Ben


Ben Rayner
Certified LabVIEW Developer
www.DSAutomation.com

[camille0190]

This application is the anemometry laser.
We must detect speed particle.
The signal is a burst modulated at fd=150 MHz.
the mathematical signal is :
s(t)=Aexp(-fd^2*t^2*m^2)*cos(2*pi*fd*t)+(gaussian noise).
This signal is generated randomly (period max 1 ms)
I numerise this signal at BP = 500 MHz.
I think with FPGA or/and NI card recognise this signal mixed with noise (32 dB) and parasite burst for trigging an other acquisition system and record only the good burst.

I hope exist one solution without hard development.

Thank you for your help.

[Robert_Jackson]

Sir,
This sounds like an application that is within the range of either the NI 5112 or 5122 Digitizer (High End Scopes). Here is a Tutorial regarding similar applications called "High-Speed Event and Defect Detection with Real-Time Response".
http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/3a67e74929eb663986256ae2005c6c1d?OpenDocument

The NI 5112 two-channel high-speed digitizers from National Instruments come with unique event detection capabilities that can detect events or transient signals continuously over months and timestamp these events with nanosecond accuracy. With a maximum sampling rate of 100 MS/s, an analog input bandwidth of 100 MHz and deep memory of up to 32 MS/channel, an NI 5112 can digitize thousands of transi
ents with resolution high enough to extract detailed information from the signal.

I believe that NI products can perform this operation. However, I recommend you contact National Instruments at 1-800-433-3488 and discuss this application with us. Depending on your application a PXI-5112 or 5122 might be suitable.

Regards,
Robert Jackson
National Instruments