DAD Integration ENGR 1182.03 Lecture. Learning Objectives of Lab  Students will finish building and calibrating the Fluorescein Detection Circuit by.

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Presentation transcript:

DAD Integration ENGR Lecture

Learning Objectives of Lab  Students will finish building and calibrating the Fluorescein Detection Circuit by connecting the DAD to the Binary Voltmeter circuit.  Learn the importance of calibration.

Circuit Schematic DAD

Chipholder on DAD 1.Detection well centered over the sensor. 2.Screw heads fit into holes in the DAD for flush fit.

Detection Alignment Device (DAD) Detector Slot Blue LED Chamber Chip Holder Alignment Holes

DAD Connection  After completing the circuit testing from Lab 3, connect the detection alignment device (DAD) in place of the potentiometer.  Be careful with polarity (instructors need to check before applying power!)  Connect extender leads from DAD LED and photodetector to appropriate pins of prototype board. Silver mark on leads is ground connection.  Do not touch the pins on leads from the DAD!!!

DAD Verification Diode 2 wires Photo- Transistor 3 wires Fluorescein Detection Circuit DAD Check DAD- Polarity is critical. Have instructors check.

Integration and Calibration  Clean and place chip with chipholder on DAD. Choose placement for best alignment of photodetector under detection well. Rotate for best alignment.  Don’t forget to put a drop of water between the chip and the chipholder bottom.  Obtain DI water and 5ml sample of 1000 ppm fluorescein from front of lab.  Create 4 samples of fluorescein using your syringes and the glass vials provided.  The three samples should be 750 ppm, 500 ppm, 250 and 125 ppm. These will be re-used in future labs. Mark their concentrations.

Calibration  Using readings of known concentrations of fluorescein, a calibration curve is created. Always start calibrations with DI water value.  The equation associated with the curve can be used to extrapolate values of unknown concentrations of fluorescein from the known values.

Calibration of LOC  First use DI water to fill the detection well in the chip. Cover with bucket and obtain the LED readout. This is your baseline value (ideally less than 8).  For each sample fill the detection well, cover DAD, obtain corresponding LED readout.  Repeat this step for each sample as time allows and record on your lab worksheet.  Average the values for each concentration.  Construct a calibration curve of average LED readout vs. concentration.