I have now completed the anechoic lining tests and reached an acceptable combination of materials.
To recap, over the last couple of weeks I have used an audio frequency amplifier to increase the transmit power of the pulsed tx signal. I expected this to provide poor results since the pulse was 6.6 uS long, hence providing [...]
For about 2 weeks now I have been struggling to find a test that I could perform to ascertain the absorption coefficient in a small tank. The problem is that this tank is only 0.5 m x 1.5 m x 0.3 m and most tests are producing spurious reflections that are masking the reflection that [...]
Just to remind myself for next time, when entering variables into windows’ PATH, all entries seperated by a semicolon MUST NOT have a space in between. If you do then the compiler (mingw32-make) complain about:
‘g++’ is not recognized as an internal or external command
The Final Preamplifier for the acousic disdrometer has been designed and built and is working well. Below are a few pictures. The only thing that I would do differently next time is make the whole thing single supply rather than dual supply. Becuase I have used a rail splitter and connected the ground from that [...]
I tried to get the open-source drivers working, but it just messed things up. So I used this guide to install the propriatey drivers.
I am about to try PikLab with SDCC (Both available via Synaptic Package Manager) and an ICD2. To install the IDC2 I followed this tutorial. It’s supposed to be for the Pic Kit 2, but its just about the same for the ICD2. SDCC also requires GPUtils, so install that too.
One problem so far is [...]
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Update: As of Ubuntu 8.10, my Buffalo adaptor was recognised instantly and WPA2 works out of the box. Well done ubuntu!
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Background:
I am using a Buffalo WLI-U2-KG54 USB wireless device and the default linux USB driver (the rt2500usb) would not support WPA encryption and it would not work at all. After days of searching through other [...]
I have come to the conclusion that voltage amplifiers are better than charge amplifiers. Equations state that the gain should be the capacitance of the hydrophone divided by the capacitance of the integrating capacitor. When creating two circuits with (about) the same gain, the voltage amplifier always outperforms the charge amplifier.
This could be because of [...]
I have implemented a new microcontroller that has simultaneous sampling and a slightly higher sampling rate. I could then interpolate the data with pretty good results using a simple padding + band pass filtering technique. The higher the SNR the better it worked.
However, I have hit a great big wall. It all [...]
I’ve had a very serious problem recently regarding the long term stability of the NI-4462.
Problem:
Everything works fine for about 20-inf secs but then all of a suddent the DAQmxReadAnalogF64 function returns a 1 rather than a 0.
Solution:
The errors were buffer overrun errors (annoying that the 4462 almost always returns 1 as an error. [...]