Visible Light Photon Counter Integrator Group 48: Austin Jin Katie Nguyen Myoung Hyun Kim Mock Design Review for ECE 445, Spring 2016 TA: Ankit Jain Table of Contents 1 Block Diagram
2 Circuit Schematic
3 Calculations
4 Simulation Plot
5 Block Diagram Description
6 Requirement and Verification
7 Safety Statement
2 2 3 4 4 5 5 6 1
1 Block Diagram 2 Circuit Schematic Figure : Integrator Circuit with Generic Op Amp [1] 2
3 Calculation 3
4 Simulation Plot Figure : LTSPICE Simulation of Integration Circuit with Single Pulse Function 5 Block Description Integrator Circuit Current methods of resolving the photon­number of the laser pulses rely on the incoming photon to trigger a certain trigger level (mV) responding to the number of photons for that energy level. However, this is an inherently faulty method as the detector can read the photon as be less than it should be. Integrating the analog signal and calculating the area under the curve will give us a much more robust measurement. Even though the peak amplitude of a ​
­photon event will fluctuation, the overall charge (area) under the curve will be approximately linear to the number of photons detected during the pulse. 4
6 Requirements and Verification 3.1 Requirements and Verification Table Block Integrator Requirement Verification 1. Successfully integrates a signal delivered from the VLPC. 2. Integrates a signal within a 1 ns range +/­ 10% Points 1.Verification Process for Item 1: 50 a) Generate a periodic mock pulse (sawtooth… etc.) using a function generator. (Mocking a signal sent by VLPC) b) Observe a transient response of the integrator c) Verify the design can integrate a given signal by analyzing output saved in a log file. 2. Verification Process for Item 2: a) Measure the results of the integral with an oscilloscope. b) Export data from the oscilloscope to a log file to verify that design can integrate a given signal within a 1 ns time frame. 7 Safety Statement 7.1 General Safety ● All group members will receive appropriate laboratory training as required by the coursework ● Voltage/power rating of components in the circuitry and power supply will be checked and confirmed prior to implementation. 7.2 Laser Safety ● All members of Group 48 will be trained and authorized to operate a laser to the specification of Professor Kwiat. 5
● This project requires a laser as a primary source therefore, protective eyewear is necessary to ensure safe interactions. ● All reflective watches and jewelry will be removed before operation with a laser. ● A laser will not be left unattended to ensure safety of every individual in Professor Kwiat’s lab. References [1] P.Tapashetti, A. Gupta, C. Mithlesh, A.S Umesh, "Design and Simulation of Op Amp Integrator and Its Application", ​
International Journal of Engineering and Advanced Technology ​
, pp. 12­19, 2012. 6
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