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NSGF 2000 PICO EVENT TIMER

NSGF 2000 PICO EVENT TIMER. HERSTMONCEUX SLR STATION. Here at Herstmonceux we have used the commercially available Modules from Thales Systems. The Timing System has been designed using 3 Modules: Two Timing Modules and One Clock Module.

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NSGF 2000 PICO EVENT TIMER

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  1. NSGF 2000PICO EVENT TIMER HERSTMONCEUX SLR STATION

  2. Here at Herstmonceux we have used the commercially available Modules from Thales Systems. The Timing System has been designed using 3 Modules: Two Timing Modules and One Clock Module. This is all we need for a simple START/STOP System.

  3. A special input board has been designed to enable our ranging PC to control the selection of 3 different types of start input signals and 2 further inputs to each module: 1-pps and 1-KHz pulses. The 1-pps is applied to both timing modules, allowing epoch synchronisation.

  4. The 1-KHz pulses are to determine the offsets between the modules. All modules are to be connected to, and controlled by, our Ranging PC via a 96-bit DIO interface.

  5. HARDWARE • Should not degrade the specification of the modules; • 2 modules required as minimum for start/stop time intervals; • Should allow for independent Epoch Timing &/OR Time Interval Measurements; • Automatic Epoch Reference via 1-pps pulses from external GPS reference;

  6. Automatic Internal Offset Determination between Modules; PC interface should not affect the maximum repetition rate of 2.0KHz; PC should not degrade the high resolution of the modules

  7. The Input Board Main goal not to degrade the Thales modules specification; Careful design of Input Board; Separate GND and Power Supplies for the different parts; Use of Opto-Couplers for logic control by ranging PC.

  8. The input board has to: • Handle, switch and enable 3 types of pulses • Input Pulses: • Start pulses (NIM/TTL etc) from laser and stop pulse from the C-SPAD • 1-pps pulse from GPS • 1 KHz pulses on-board the PCB • Output Pulse: • Standard ECL into 50Ω @ -2Volts

  9. Power Supplies • Separate power supplies for each module. • 8-Euro-Card size power supply units optimised for it’s specific purpose. • Forced air cooling to remove heat from these power supplies.

  10. NSGF 2000 Pico Event Timer Ranging PC Input Board Module 1 96 96-bit DIO Module 2 Clock Module 8 Power Supplies Fig.1: General Setup Block Diagram

  11. START Input Select Module Read Module Write + Module 1 PC Control 1 pps from GPS For Epoch Ref - 1 KHz Pulses for Module Offset Cal + Module 2 - STOP 1 pps 10 MHz Clock Module Hx GPS PC Control Principle of Input Board Fig. 2: Principle of Input Board

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