Magnet will separate the +1 & -1 spin states, and you should now have at least two dips in your signal. Magnet) and place it a few centimeters from the diamond. Spectrum, ask your instructor to look over your setup. If you are still not able to get a clear dip in your Check all other connections and optical alignment.Ĥ. Adjust the antenna, making sure it is centered and aboutģ. Choose a difference sweep in your run and see if there isĢ. Near the center of the sweep, here are some things to try:ġ. Troubleshooting: If your spectrum does not show a clear dip This results in a very quick sweep that includes the dip, and hence the The voltages very quickly when it resets. Voltage does not go from maximum to minimum instantly, it sweeps through all [Note the two very small dips at the beginning and end of Spectrum, corresponding to a microwave frequency of about 2.87GHz. Spin states are at roughly the same energy, hence there is only one dip in the With no magnetic field (other than the Earth’s) the +/-1 Zero Magnetic Field Fluorescence spectrum
#PASCO CAPSTONE LOG AXIS FULL#
Adjust the axes so that one full sweep takes up most of theĭragging the axes and by dragging the graph itself. Should be able to clearly see the ramped signal. Interface is set to fast monitor mode, and then hit “monitor”.
#PASCO CAPSTONE LOG AXIS GENERATOR#
Go to the signal generator setup and click the “on” tab – this will begin the Check with your instructor to confirm your setup is readyīefore you proceed to plug in the power to the VCO. Stimulate electrons in the NV- centers to the +/-1 spin states.Īdjust the antenna so that it is centered about 2mm aboveĪt this point you should have all the optics aligned for maximalįluorescence and the microwave source ready to go. The antenna is a simple copper loop soldered to the end ofĢmm above the diamond, it will provide the necessary microwave radiation to SMA cable connected to the microwave antenna. The VCO (again, this prevents the return signal from damaging the VCO). There should be a circulator connected to the main output of You should connect all the pins, but keep the main AC plug unpluggedįrom the wall until everything else is aligned and setup. This is done with a standard AC adapter connected from the wall to the Right side) should be connected directly to the tuning pins on the VCO and to The output from the 850 Interface (Output #1 on the top With a sensor connected to the interface. The VCO to sweep through the desired frequency range within 2.7 – 3.1GHz. 15 amplitude would yield a tuning voltage range of 1.3 - 1.6V. Seconds) - 10Hz, depending on which template you use. To see this setup, click on the Hardware Setup tab on the This is done using a positive ramp signal. With voltages from roughly 1.26 – 1.62 Volts (these exact values can vary slightly from day to day). Sweep through the frequencies from 2.7 – 3.1 GHz, the VCO needs to be tuned The interface contains a signal generator that outputs from the top Voltage is supplied by the 850 Interface. The output frequency of the microwave signal is determined by a tuning voltage
Once you have aligned all the optics to achieve a strongįluorescence signal, you are ready to set up the Microwave source. Making sure it is illuminating the diamond maximally. Make adjustments until the intensity is maximized. Will notice changes in the light intensity measured. Optical assembly and light sensor and the back of the optical assembly, you Minute adjustments to the spacing between the diamond and the front of the You should now see the data for the light sensor Interface (make sure the USB cable is plugged into both the interface and theĬomputer) and run the Capstone program entitled, “Magnetometer Project”. Try moving your finger back and forth until the spot is theĬan also vary this distance from the front lens to the diamond to try to If you see a bright red focused point on your finger. Properly focusing, you can place your finger where the light sensor is and see Make sure everyone in the group has their goggles on! To check to see if the light is On the laser and shine it directly on the diamond. Place the optical assembly close to the diamond until theĬenter of the front lens is about 0.5cm from the diamond. You will be given the diamond to test for fluorescence. When you have this all set up, ask your teacher to check the Make sure you have your goggles on (!!) and test the laser, roughlyĪligning it to the top of the diamond pedestal. These are the only pieces of equipment you will need rightĬonnect the light sensor to the Analog Input A on the
Light sensor in the back of the optical assembly.
Next place the diamond pedestal in front of the opticalĪssembly, which should be at a right angle to the laser (refer to the overall Laser on and off using the middle connection (without moving the laser out of The first step is to locate all the components in the setupĭisconnect the laser in the middle of the cable and plug in the AC