Instrumentation and Measurement & Lab – Week #5 Lab 1

Optical Sensors Lab

1.     Using Multisim, design a system using the photoconductive cell shown in the figure below to measure and display light intensity. Make the design such that 20 to 100mW/cm2 produces an output of 0.2 to 1.0V. What is the readout error when the intensity is 60mW/cm2? Show all calculations and Multisim results.

2.      For the turbidity system show in Figure 2 below, two matched photoconductive cells are used in R vs. IL as given in Figure 3 below. Design a signal-conditioning system that outputs the deviation of the flowing system turbidity in volts and triggers an alarm if the intensity is reduced by 10% from the nominal of 15mW/cm2.

figure 2
Figure 2


figure 3
Figure 3

Rules for lab submissions:

1.     The lab document must be a Word document.  PDF files are NOT accepted.

2.     All screenshots must be included.

3.     All Multisim screenshots must include the date/time stamp. See TOOLS AND TEMPLATES for the procedure to display the date and time.

4.     Any and all Multisim files must be submitted.

5.     Any equations used must be typed in Word.  Copy and paste of equations from outside sources is prohibited.

6.     No graphics are allowed in the Word document other than screenshots of circuits from Multisim and hardware if applicable, with the date/time stamp.

7.     The lab template should be used.  Specifically, it is brought to your attention that a summary MUST be provided explaining the results of the labs, the relationship of the results to expected results, and any challenges encountered.

8.     Hardware portion of labs should include photographs or videos of the assembled circuit with your name and student GID number written on paper next to the circuit. If the measurements of the physical circuit are made through a USB connection to the computer, then there should be screenshots of the instrument readings with the date and time stamp clearly shown.

Any violation of the submission rules above will result in a grade of 1.

Grading Criteria

Maximum Points

Meets or exceeds established assignment criteria

40

Demonstrates an understanding of lesson concepts

30

Clearly presents well-reasoned ideas and concepts

30

Uses proper mechanics, punctuation, sentence structure, spelling and APA format

10

Total

100