Part Number: TDC1000-TDC7200EVM
We are using a 1MHz transducer with a TDC1000-GASEVM for level measuring. The transducer was installed as per How to Select and Mount Transducers in Ultrasonic Sensing for Level Sensing and Fluid ID
The container I'm using at the moment is a domestic 5L metal Keg as shown in the image below:
The TDC1000-GASEVM settings I'm using can be seen in the configurations panel below:
We are able to detect the Echo in the COMPIN without problems when the container is more than half full, but there is always some noise (I'm not sure if that is the Ringdown) in the COMPIN channel as indicated by the red rectangle in the image below (sorry, we only have a 2-channel oscilloscope).
Even when NO transducers are connected to the TDC1000-GASEVM, we can still see a similar disturbance in the same location.
According to this and this pages, the TDC1000 is able to detect levels under 3cm, however, we are being limited on approximately 10cm while using the standard TOF mode as can bee seen in the video below:
CLICK ON THE IMAGE TO PLAY THE VIDEO
CLICK ON THE IMAGE TO PLAY THE VIDEO
In this experiment, we started with the container completely full and we completely emptied it very slowly (the video is fast-forwarded). The level is successfully measured down to around 10cm, which is when the Echo signal meets the noise detected in the COMPIN channel. After that, "new Echos" are detected
- What could be a potential cause for this 10cm lower limit?
- Apart from reducing NUM_TX, what else can we do in order to reduce the minimum detectable level?
- In the standard TOF, is the RX channel grounded before the TX burst?
- Would you recommend using two side-by-side ultrasonic transducers (one emitter and one receiver) in order to overcome this issue?
