Dr. Steve Morra, DE, PE.
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1 PDV Fringe Recorder Development Dr. Steve Morra, DE, PE Third Millennium Engineering Plano, Texas USA
2 Motive Agenda Interferometry t approximation for PDV High-Speed PDV systems and costs PDV Fringe Counter Views PDV Fringe Counter Block Diagram PDV Fringe Counter Specs Conclusion 2
3 Motive Nashville SCCM at TME booth Many researchers interested in PDV Kept hearing the ~$200K entry cost was prohibitive ~$50K was more like it Often wanted just one channel New-comer engineer to PDV community Kept wondering if there e was another way to generate e PDV velocity profiles The results were usually quite grainy graphs 3
4 Interferometry approximation for PDV Interferometer is fundamentally position based Reinforcement or cancellation interference occurs in wavelength increments (1.55 um) PDV interferometer used to measure velocity, not position 1.29 GHz per km/sec is rate of reinforcements and cancellations at receiver output 645 MHz per km/sec is rate of reinforcements or cancellations at receiver output Velocity information is provided by frequency, not amplitude Position resolution several orders of magnitude better than what is needed for velocity Final velocity profiles from post-processing software are inherently grainy Velocity profiles typically plotted on a linear scale with no better than 0.1% resolution 0.1% resolution of 10 km/s full scale is 10 m/s resolution 10 m/s is a 6.45 MHz rate of reinforcements or cancellations This means that the receiver output rate could be divided down No perceptible resolution loss on the final velocity profile Real time oscilloscope oscope bandwidth d could be reduced Special fast counter circuit can be used to directly generate position, velocity, acceleration, and jerk profiles (PDV Fringe Recorder) 4
5 High-Speed PDV Systems and Costs Classical 4-Ch. BR Probe type Classical 4-Ch. NBR Probe type ~$20K 2W Coherent CW Laser External Input ~$2K Optical Monitor Circulator VOA Fiberoptic Receiver 4-Ch Real Time Oscilloscope Interferometer BR Probe x1 to x4 Moving Target >$61K (4GHz) to >$139K (12.5 GHz) Post-processing Software/Computer Velocity Profile Output ~$20K 2W Coherent CW Laser ~$2K Interferometer External Input Optical Monitor Tap Coupler VOA Coupler Fiberoptic Receiver 4-Ch Real Time Oscilloscope Circulator NBR Probe x1 to x4 Moving Target >$61K (4GHz) to >$139K (12.55 GHz) Post-processing Software/Computer Velocity Profile Output 1-Ch. BR Probe type with PDV Fringe Counter ~$10K Circulator Interferometer ~$10K 0.5W Coherent BR Moving 0.5W Coherent CW Laser Probe Target CW Laser 1-Ch. NBR Probe type with PDV Fringe Counter Tap Coupler Circulator NBR Probe Moving Target VOA VOA Optical Monitor External Input Fiberoptic Receiver Limiting Amplifier PDV Fringe Counter Pre-scaler Internal Clock Hi-speed Counter ~$1K Computer GUI Excel Position, Velocity, Acceleration, and Jerk Profile Outputs Interferometer Optical Monitor External Input Coupler Fiberoptic Receiver Limiting Amplifier PDV Fringe Counter Pre-scaler Internal Clock Hi-speed Counter ~$1K Computer GUI Excel Position, Velocity, Acceleration, and Jerk Profile Outputs 5
6 PDV Fringe Counter Views 6
7 PDV Fringe Counter Block Diagram Signal RF In External In Squelch Enable LOS Reset 547 Hz-156 MHz PDV Fringe Counter (Prescaled, asynchronous) 0.1uF Microwave Microwave-RF Clock Synchronous Counter Limiting Prescaler and Latch (16 bits) Amplifier (Divide id by 64) Reset & 35 KHz-10 GHz Internal Armed Reset High Speed Ext Comparator Selector Control Logic 100mV threshold Et External lti Reset Fll Full Done Ti ed Select Data (record) Clear 10 ns SRAM 1M x 16 bits Address Synchronous Address Counter (20 bits) Reset Data (play) Clock Selector Slow Clock Select Control Logic & I/O Embedded Controller 100 MHz 10 MHz Supply LAN Connects to PDV receiver analog RF output Connects to optional external trigger source (has internal trigger) PDV receiver analog output passes through a microwave limiting amplifier (LA) and produces a digital output for outputs from < 5 mvpp to >900 mvpp LA digital output is divided by 64 and enters a 16-bit high-speed "Fringe" counter. Counter output is sampled and stored in a 1M x 16-bit fast static RAM every 10 ns or 100 ns (switch selectable). After a PDV run, the RAM time-sliced fringe count data (1M data points) is uploaded d to a computer via an Ethernet LAN (takes <10 min), saved as a 10-30MB CSV file (Excel readable) The 1M data points represent the target position versus time in 10 or 100 ns steps, which can be smoothed or edited as needed and differentiated to obtain position, velocity, acceleration, jerk Clean and quick results due to the hardware processing approach 7
8 PDV Fringe Counter Specs Target velocity range: ~5 cm/s to ~15.5 km/s Target position range: ~6.5 meters with a ~100 um resolution Recording duration: ~10 ms (10 ns clock) or ~100 ms (100 ns clock) ing: external or internal External trigger (50 ohm) occurs when logic input exceeds 100 mv Internal trigger occurs when the velocity exceeds ~5 cm/s, 64 fringes have occurred, and the PDV receiver output signal is >5 mvpp Squelch switch for high noise PDV receiver outputs Ethernet 10/100Base-T for data upload to computer (10-30MB CSV file) Excel used to produce position, velocity, acceleration, and jerk profiles Various front panel status LEDs and mode control switches 1/4 rack ModBlock (1U x 8" deep), weighs <2 pounds, 12 VDC power Model M390A, $15K 8
9 Conclusion PDV Fringe Counter Can replace the 4-channel real-time oscilloscope and postprocessing software in many high-speed PDV applications from ~5 cm/s to ~15 km/s Can directly provide position, velocity, acceleration, and jerk output profiles from CSV file using Excel Implements a single channel, easily expandable to many channels PDV system costs, sizes, and power significantly reduced 1 channel PDV Fringe Recorder system costs ~$41K 4 channel PDV Fringe Recorder system costs ~$141K, performs faster than 12.5 GHz classical system (to ~15.5 km/s) 4 channel classical PDV system costs start between ~$143K (4GHz) and ~$221K (12.5GHz), scope comes in 4-channels only Next steps Complete hardware and software tests Verification against classical PDV system (any volunteers?) 9
10 Third Millennium Engineering Helping customers create and manufacture advanced technology products for our future Can supply any PDV system or equipment required or shown in this paper Supplier of high quality custom engineered equipment, products, and systems using fiber optic, microwave, RF, or advanced technologies Quantities from 1 to 10+ units in typically 2-3 months Simple to complex, typically multi-functional functional, provided with any features and accessories needed Formal specifications not required, verbal specifications and goals adequate to produce quote Consulting, Engineering, Manufacturing, Support Commercial, Industrial, Defense, Emerging Industries Dr. Steve Morra, President, steve@tmeplano.com , 1132 Plano Texas, since 1996, registered Texas engineer, 3CPK6 cage code View PDV and other catalogs on website, call or to receive quote Why risk making it or doing without when you can buy exactly what you need? 10
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