UST Poster
![UST Poster](https://uploads-ssl.webflow.com/5fb2cd136f4b440b2e600962/5fbbf2ac00012707b937a6fc_pvsc37-poster-2011-final-3.png)
RUV: How It Works
![A schematic of RUV system for crack detection in PV wafers and cells](https://uploads-ssl.webflow.com/5fb2cd136f4b440b2e600962/5fbbf22bd1a360698c9790ad_pvsc37-poster-2011-final-1.png)
Key components:
- Transducer gives a frequency sweep;
- Ultrasonic probe records resonance curve characteristics: (a) peak position, (b) amplitude, and (c) bandwidth;
- Proprietary statistical algorithm gives "accept" or "reject" command;
- Robotic grippers provide load and unload (RUV-2.2)
![Frequency sweeps: Green curve is a normal wafer, Red curve is a cracked wafer](https://uploads-ssl.webflow.com/5fb2cd136f4b440b2e600962/5fbbf277a6ffea618c5c903c_pvsc37-poster-2011-final-2.png)