High-speed data logging solution

[Pavel_47]

Hello,

I wonder does exist a solution that allows to log analog data at let's say 100MS/s.

We have analog signal coming from some particular photodevice, that we cannot measure directly.

Photodevice receives optical pulses at 10MHz rate.

Thanks.

Sincerely,

Pavel.

[Jeffrey]

Hello @Pavel_47

Measurement Computing's fastest analog input device is the USB-2020 (https://www.mccdaq.com/usb-data-acquisition/USB-2020.aspx)

The USB-2020 data acquisition (DAQ) device provides simultaneous, high-speed analog inputs at rates up to 20 MS/s per channel. Users can sample data at 20 MHz directly to the 64 MS onboard memory or continuously stream data to a host computer at 8 MHz.

Unfortunately MCC does not make an analog input 100 MHz data acquisition device at this time.

[Brooose]

If you don't need more than 12 bit resolution or so, why not just use a good oscilloscope to capture the data?  A halfway decent windows scope can acquire at like 10 GS/sec or so.  

[Pavel_47]

8 minutes ago, Brooose said:

If you don't need more than 12 bit resolution or so, why not just use a good oscilloscope to capture the data?  A halfway decent windows scope can acquire at like 10 GS/sec or so.  

Because DUT is about 40m from oscilloscope ... and it's underwater.

[Jeffrey]

OK, it's underwater.  Would have been good to know that in your list of requirements.  Are there any other unique requirements?

Any data acquisition device would need to be located near the sensor and not above the water.

As your data is generated at 10 MHz, to satisfy Nyquist sampling theorem you need acquire data at 2.5 times the max data rate.  This brings your max sampling rate to 25 MHz.  

Perhaps consider using a Raspberry Pi computer with a Digilent Analog Discovery 2 (https://digilent.com/shop/analog-discovery-2-100ms-s-usb-oscilloscope-logic-analyzer-and-variable-power-supply/)

No matter the device you select, it will be for you to provide an enclosure capable of handling the hydrostatic pressure at whatever depth you place the test equipment. a column of water 40 meters (131 feet)  = 56.9 PSI.

Edited October 11, 2022 by Jeffrey
added info