Man-machine interaction type multifunctional FPGA coincidence measurement system and measurement method thereof

Abstract

The invention discloses a man-machine interaction type multifunctional FPGA coincidence measurement system and a measurement method thereof. The invention discloses a data acquisition device, belonging to the field of electronic technology application, and can directly realize the functions of channel selection, window setting, data delay setting, acquisition time, single data acquisition or continuous data acquisition, data delay scanning and calibration, data display, data storage, interface parameter storage and the like in an upper computer application program. A coincidence window adjustment method and a mixed time delay measurement method are provided, automatic measurement and calibration of delay are achieved, and signal instability caused by repeated manual adding and subtractingof delay lines and clock regulation and control is avoided. A channel selection system and a coincidence data processing system are integrated, selection of channels on software is achieved, data canbe collected and stored in real time, then a parallel processing algorithm is designed in coincidence operation, and the operation speed is increased; dozens of coincidence measurement modules are designed inside, and various coincidence operations can be carried out at the same time. The invention is good in expansibility, high in coincidence counting efficiency and high in portability and robustness.

Description

technical field [0001] The invention belongs to the application field of electronic technology, and in particular relates to a human-computer interactive multifunctional FPGA coincidence measurement system and a measurement method thereof. Background technique [0002] Coincidence measurement is a technique for recording the correlation distribution between the responses of two or more detectors. It is widely used in signal detection and analysis in scientific research and engineering, especially in the simultaneous detection of multi-photons in quantum optics. The coincidence measurement of photons can be further used to explore the non-classical characteristics of the associated light source, but the time delay of the signal processing system, the dark count of the detector and other effects directly interfere with the accuracy of the coincidence count. [0003] In order to accurately measure the relative delay between signals, methods such as time-to-digital converter (TD...

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Problems solved by technology

The coincidence measurement of photons can be further used to explore the non-classical characteristics of the associated light source, while the time delay of the signal processing system, the dark count of the detector and other effects directly interfere with the accuracy of the coincidence count

[0003] In order to accurately measure the relative delay between signals, methods such as time-to-digital converter (TDC) and time-to-amplitude converter (TAC) are often used in the technical field. These technologies first It is necessary to detect the Start and Stop signals. When the interval between the two signals is not an integer multiple of the measurement clock, the time measurement will be inaccurate, and the module is mainly a Field Programmable Gate Array (Field.Programmable.Gate.Array FPGA peripheral device , due to the distribution parameter effect, it is not conducive to high integration and high cost

In order to improve the clock resolution, a higher frequency clock can be used, usually up to GHz, which is not easy to achieve in ordinary circuits

[0004] In addition, most of the coincidence measurement systems developed at home and abroad can only collect data unilaterally. The parameters such as counting time and coincidence window have been solidified in the hardware. openness and flexibility

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