Crystal component is popularly used in the field of telecom , toy , security , computer , multimedia , digital products , and so on 石英晶体产品在不同的电子工业领域起选频、鉴频、稳频作用广泛应用于：电讯、玩具、家电、安防、计算机、多媒体、数码产品。 。 。 。 。 。
The frequency of the pulse is the same as that of the crystal oscillator . the pulses sampled the output of the vco and generate the error signal . the error signal is amplified , 误差电压经放大后送入环路滤波器进行滤波和再放大,然后去改变变容管偏置电压,控制振荡器输出频率,达到稳频的目的。
The frequency - stability of an al ] - solid - state nd : yvo4 laser is significantly improved by means of a specially designed f - p interferometer used for the frequency standard in the frequency - stabilizing system 利用f ? p ( fabry - perot )腔作为频率参考标准的激光稳频系统，是长期以来使用的一种简单而有效的装置。
Then the paper analyses the oscillator ' s operational principle , classify and noise theory . in the following chapter , several kinds of the dielectric resonator oscillators , esp . their operational principle , are introduced 然后介绍了振荡器的工作原理、分类和噪声；并在此基础上介绍了几种介质谐振器稳频振荡器的工作原理。
Again , influence of mechanical dither on gyro frequency stabilization is discussed for the first time . a frequency stabilization circuit is designed and the approach to improve the precision of frequency stabilization is put forward 同时，首次分析了机械抖动对陀螺稳频的影响，设计了小抖动稳频电路，指出了提高稳频精度的途径。
After analyzed each part of the loop , the system ' s open - loop and closed - loop transfer functions are presented and some parameters are optimized to ensure that the system has better stability and response speed 设计了小抖动稳频控制系统，分析了各部分的组成与传递函数，给出了系统的开环和闭环传递函数。根据传递函数优化了有关参数，使得系统有较好的稳定性与响应速度。
In 3 . 3 the theory of frequency stabilization was presented systematically in 3 . 4 the pid technique in feed back loop is simply introduced experiment arrangement , and experiment results of less than 340khz frequency noise is presented in 3 . 5 3 . 3系统介绍边带稳频的理论。 3 . 4围绕pid技术介绍对反馈信号的处理。 3 . 5介绍了实验装置和实验过程，得到了优于340khz的频率稳定性。
A normal co - axis he - ne laser tube with bore length l = 190 mm was used . with pid and self - organised fuzzy control , the frequency error could be confined to a 10 ~ 9 level . in addition , preheating time and anti - interference were within requirements 选用腔长l = 190mm的普通同轴式he一e激光管，采用pid和自组织模糊控制模式可达到10一的稳频精度效果，并满足预热时间和抗干扰要求。
Therefore , the frequency - stabilised double longitudinal modes with thermoregulation were adopted . this method was realised by winding wire with high electrical resistance on to the neck of laser tube . heating was controlled by self - organised fuzzy control method 为此，提出了增加有缠绕于激光管颈上的电阻丝辅助加热控制环节的自四川大学博一l :学位论文组织模糊控制双纵模热稳频方法。
In accordance with the recommendation for the practical realization of the above definition of the international committee of weights and measures , the laboratory maintains the metre through the wavelength of the 633 nm radiation from an iodine - stabilized helium - neon laser 按国际计量委员会对实现米定义的建议，本所透过碘稳频氦、氖激光器放出波长633nm的幅射以达至拥有米的标准。
