1 / 9

Constructing Prototype Lock-in Amplifier with LabVIEW & DAQ

Constructing Prototype Lock-in Amplifier with LabVIEW & DAQ. Xiaoyu Wu 08300290011 Dept. of Physics, Fudan University. What is Lock-in Amplifier(LIA)?. Detect & Measure Signals Even with overwhelming noise Typical S/N ratio -60dB. Signal + Noise. Amplitude + Phase as DC.

kevork
Download Presentation

Constructing Prototype Lock-in Amplifier with LabVIEW & DAQ

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Constructing Prototype Lock-in Amplifier with LabVIEW& DAQ Xiaoyu Wu 08300290011 Dept. of Physics, Fudan University

  2. What is Lock-in Amplifier(LIA)? • Detect & Measure Signals • Even with overwhelming noise • Typical S/N ratio -60dB Signal + Noise Amplitude + Phase as DC

  3. Typical Application: Scanning Tunneling Spectroscopy

  4. Principle of LIA • Phase Sensitive Detection • Orthogonality of Sinusoidal Functions LOW-PASS FILTER

  5. LabVIEW & DAQ

  6. Realizing the Algorithm

  7. Demonstration

  8. Features • Signal Frequency: ~Hz to ~kHz • Signal Amplitude: 0.005V tested • Sampling Rate: maximum 50kHz, 40kHz tested

  9. Drawbacks • S/N Ratio • Function Generator

More Related