Timing device built based on standard ruler and permanent principle of light velocity

Abstract

The invention provides a timing device built based on a standard ruler and a permanent principle of light velocity, which is high in precision, high in stability, relatively small in size, light in weight and low in cost and belongs to the field of clocks. The timing device comprises a frequency divider, the standard ruler, a phase discriminator and a voltage-controlled oscillator, wherein a pulse signal output by the voltage-controlled oscillator is input into the frequency divider and the frequency divider outputs a two-sub-frequency clock signal and a four-sub-frequency square wave signal; the square wave signal is divided into two paths, one path is a direct signal, the other path is a time delay signal output by the standard ruler, and a stable time difference exists between the direct signal and the time delay signal; the direct signal and the time delay signal reach the phase discriminator for period and phase detection separately; a detection deviation signal output by the phase discriminator is input into the voltage-controlled oscillator, and the period and the phase of a pulse signal output by the voltage-controlled oscillator are regulated and controlled to achieve negative feedback control; and the standard ruler is a transmission line with a standard length and a stable time delay. The standard ruler is made of an invar alloy of which the thermal expansion coefficient is zero or the thermal expansion coefficient is positive and negative complementary.

Description

technical field [0001] The invention relates to a time timing device, in particular to a time timing device constructed on the basis of a standard ruler and the principle of constant light speed. Background technique [0002] At present, atomic time is recognized as the most stable time reference. The frequency stability of a general atomic clock is 10 -12 ~10 -15 order of magnitude, with an accuracy of 1 second within 3 to 30 million years. The newly developed atomic optical clock has a frequency stability of 10 -16 ~10 -17 order of magnitude, with an accuracy of within 1 second for 3 to 3 billion years. [0003] There are two directions for the development of atomic clocks: one is higher frequency atomic optical clocks, using a series of cutting-edge technologies such as laser cooling, magneto-optical trap condensation, and optical combs to further improve time accuracy and stability; the other is miniaturized atomic clocks, Develop a system on a chip (SoC) using coh...

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