Fig. 1. Basic structure of double light screen projectile velocity measuring system. (a) The structural schematic diagram; (b) the physical diagram

Fig. 2. Principle of TDC. (a) TDC timing schematic; (b) fine count timing schematic using a multi-phase clock TDC

Fig. 3. Device block diagram of light screen projectile measurement system using multi-phase clock TDC

Fig. 4. Histograms of measurement results at different signal time intervals Δt. (a) 0 ns; (b) 10 ns; (c) 100 ns; (d) 1 μs; (e) 10 μs; (f) 100 μs; (g) 1 ms; (h) 10 ms

Fig. 5. Time accuracy measurement results of TDC

Fig. 6. Measurement scheme using picosecond laser. (a) The schematic diagram of the measurement scheme; (b) the optical path diagram for measuring the time accuracy of the entire system

Fig. 7. Time data measurement results. (a) The measurement results of detector 1; (b) the measurement results of detector 2; (c) the measurement results of the entire system