Recent content by newyorker

Not exactly. By this posting not possible to load image, and the sketch did not represent the phenomena properly. Really the noise is summed to the scope as a DC offset, so this hide a part of the echo signal. Since I use a derivative function I can detect the echo signal until the noise is not...

The distance is determined by counting the time between the echo and beginning of 40kHz emitting busrt, through a derivative function. Not simple to explain...hmm...I'm trying to reduce the emitting signal, by lowering the voltage amplitude applied to pulse tranformer that generates the 40kHz...

Dear skeptic2, thank U 4 your posts... Unfortunately I haven't any target located outside the tank to use as a fix reference...and a frequency variation is not possible, because the transducer has a very narrow bandwidth (4..5kHz only). Anyway the problem is the following: when temperature is...

I'm measuring a distance in a waste container. need to achieve the distance between the roof (where the device is fixed) and the trash on the bottom. The device is mounted outside the tank, so it's exposed to the atmospherics conditions and all job is done via embedded microcontroller card, and...

Not high accurated in truth. I have to measure the percentage of empty level of a waste container, but the temperature and air density when sun shining have a huge variation. Thank U 4 your post... NY

Thanks for your posts... But anyone knows where I can find C++ library with specific math functions that take in consideration the influence of temperature and humidity in ultrasonic distance measurement? NB

Yes, really a frequency sweep could be a good solution, but my transducer is built in an alluminium metal can, because I need it waterproof since I work for the waste field. My transducer has a very narrow bandwidth, 2 or 3kHz maximum, so I cannot follow this way.

Hi tehre, this is my firs post here! I'm designing a complex system using a 40kHz ultrasonic transducers in distance measurement for waste container level detection. Now I have a big problem because the hot season change the air properties in temperature and humidity. Anyone may help me...