White Paper

Working In The Basement: Measuring Signals Below The Noise Floor With A Lock-In Amplifier

Source: Ophir Photonics

By Shimon Elstein, Senior Physicist

Measuring optical signals in the femtowatt (10-15) to nanowatt (10-9) range can be a daunting task. Signal levels this low are lost in typical detector noise levels and swamped by background light. The noise floor for photodiode detectors operated with a small bandwidth (~10 Hz) is on the order of 1 picowatt (10-12). Further narrowing of the bandwidth by filtering or averaging will only provide a small additional reduction in the noise level.

VIEW THE WHITE PAPER!

Get unlimited access to:

Trend and Thought Leadership Articles
Case Studies & White Papers
Extensive Product Database
Members-Only Premium Content
Welcome Back! Please Log In to Continue. X

Enter your credentials below to log in. Not yet a member of Med Device Online? Subscribe today.

Subscribe to Med Device Online X

Please enter your email address and create a password to access the full content, Or log in to your account to continue.

or

Subscribe to Med Device Online