A loop response time measuring device and method for an atomic frequency standard

Abstract

The invention discloses a loop response time measuring device and method used for an atomic frequency standard. The device comprises an oscillation module, an executing module and a signal detecting module, wherein the oscillation module is used for receiving an output signal of a servo loop of an atomic frequency standard and outputting the signal after reversing the phase of the output signal of the servo loop of the atomic frequency standard; the executing module is used for acting according to the output signal of the oscillation module to control the quantum system of the atomic frequency standard to finish the quantum frequency discrimination; and the signal detecting module is used for measuring the oscillation period of the oscillation loop according to the output signal of the oscillation module, and the oscillation loop consists of an oscillation module, an executing module and an atomic frequency standard. The method comprises the following steps of: obtaining the oscillation period of the oscillation module; measuring the oscillation period of the oscillation loop; and calculating the loop response time of the atomic frequency standard according to the oscillation period of the oscillation loop and the oscillation period of the oscillation module. By adopting the device and the method provided by the invention, the loop response time of the atomic frequency standard system can be measured accurately.

Description

technical field [0001] The invention relates to the field of atomic frequency standards, in particular to a loop response time measurement device and method for atomic frequency standards. Background technique [0002] At present, passive atomic frequency standards are widely used in communication and other fields as highly stable and high-precision time synchronization sources. see figure 1 , the servo control loop of the passive atomic frequency standard is generally composed of a quantum system (also known as a physical system) and a circuit system. Among them, the quantum system provides an atomic resonance absorption line with stable peak frequency and narrow line width as a frequency reference, which acts as a quantum frequency discriminator; The output frequency is locked on the peak point of the atomic resonance absorption line. The basic working principle of the passive atomic frequency standard is that the output signal of the VCXO is frequency-multiplied and sy...

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Problems solved by technology

[0004] In the servo control loop of the passive atomic frequency standard, the quantum system, VCXO and the phase-sensitive detector in the servo loop all have nonlinear characteristics, the loop analysis is very complicated, and the loop response time of the whole system is even more difficult to analyze

Among them, the actual relaxation time of the quantum system limits the loop response time of the entire system to a large extent. In addition, the phase problem of each circuit module brings great difficulties to the acquisition of the error signal of the servo loop and the output of the corresponding correction voltage. major inconvenience, such as figure 2 As shown, due to the relaxation time of the quantum system and the phase difference of the circuit, the servo loop cannot actually collect the voltage difference between the quantum discrimination signal X at point A and point B according to the corresponding synchronous reference signal Y

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