Caesium clock11/29/2023 ![]() Therefore, there are 16 possible states of cesium, but only the transition between the | 4,0 〉 and | 3,0 〉 states is used to define SI second. ![]() These states are characterized by two quantum number F and m F, where F = 3 or 4 and m F can have integer values between – F and + F (see Figure 2B). A beam of atoms emerges from the oven at a temperature near 110☌ and travels through the state-preparation region (the A magnet in Figure 2A), where the beam is split into two beams of atoms with different atomic states. The transition signal is sent to a servo system to tune a voltage controlled crystal oscillator (VCXO).įigure 2A shows a schematic diagram of the cesium atomic clock of LIP Cs-3000. LIP Cs-3000 (see Figure 1) uses an identical two-wire magnetic field which realized by Stern-Gerlach magnet to prepare and detect atomic states and Ramsey-separated field excitation to achieve the state transitions. The contents of this paper not only contribute to the further development of LIP Cs-3000, but also can be applied to other brands of compact cesium atomic clocks to improve performance. In the end, the paper gives some environmental tests of LIP Cs-3000, which show that the clock can be applied to some complex environments. The formula for assessing lifetime can be also used in other brands of cesium atomic clocks. In addition, the paper studies how to estimate the lifetime of LIP Cs-3000 clock and derives that the lifetime of the clock is larger than 5 years. We expect that this conclusion will help improve the accuracy of the atomic clock in the future. The paper also analyzes various factors affecting accuracy and points out that the most important factor is the uncertainty of cavity phase shift. Based on the results, the range of stability of LIP Cs-3000 is calculated and the further development of the clock is suggested. The paper adopts statistical methods to obtain the distributions of the line width, signal-to-noise and peak-to-valley ratio of Ramsey pattern. To solve this problem, the paper introduces a compact magnetic state-selection cesium clock called LIP Cs-3000 which was developed at Lanzhou Institute of Physics in China. This situation is not conducive to the development of cesium atomic clocks with magnetic state selection. Although these clocks show excellent performance in many applications, the analysis of their characteristics is rarely discussed in the literature. OSA 3235B Cesium Clock has a specified accuracy of ± 1 × 10 − 12 and a stability of 8.5 × 10 − 14 at 100,000 s. The cesium clock 5071A has specifications with an accuracy of ± 5 × 10 − 13 and a stability of 2.7 × 10 − 14 at 100,000 s. ![]() Presently, there are several brands of such atomic clock that can be available on the market. Thus this kind of clock has been widely used in time keeping, navigation, positioning, communication, and other fields in the world. The function of a compact cesium atomic clock with magnetic state selection is to realize the definition of SI second in a continuous and reliable manner, providing the user with frequency signals with high stability and accuracy. In the end, the paper gives some environmental adaptability designs of the clock, which enable the clock to be used in complex environments. In addition, the method to estimate the lifetime of a clock has been proposed. It is also pointed out that the most important factor affecting the accuracy of LIP Cs-3000 atomic clock is the uncertainty of cavity phase shift. According to these results, some suggestions are put forward for the further development of the clock. The corresponding distributions of these parameters are derived by using statistical methods. The test results reveal that the ranges of the line width, peak-to-valley ratio and signal-to-noise ratio of Ramsey pattern are 340–410 Hz, 2–13 and 2,000–8,000 respectively. This paper introduces a compact magnetic state-selection cesium atomic clock called LIP Cs-3000 and analyses its characteristics.
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