| 1. | For the modulation frequency and the cavity are very difficult to maintain matching , so it is difficult to guarantee the long time steady work of actively mode - locked fiber laser
所以不能保证长时间稳定工作,必须采取特殊的措施来稳定主动锁模光纤激光器的腔长。 |
| 2. | This paper simulates and analyses the torque pulsation because of the modulation frequency and speed variation under ambipolar pulse width modulation , at the same time the results are given
本文对双极性调制的无刷直流电动机仿真分析了转速和调制频率对转矩影响同时给出仿真结果。 |
| 3. | The vibration control has two main types : initiative and passivity . i use the modulation frequency tuned mass damper to control the vibration of it and adopt ansys5 . 5 to calculate the result of it
振动控制主要有主动和被动控制，我是应用被动控制的调制调频质量阻尼器进行桥机的控制。 |
| 4. | Pulse signal is connected by the customer . signal can be sine wave or square wave . modulation frequency can be to 1mhz few model can be to 10mhz ; inner modulation type no need signal from out side
外调制式激光器留有专用的信号接口，由用户接入脉冲信号，信号可以是正弦波,也可以是方波，调制频率可到1mhz个别型号调制频率可到10mhz 。 |
| 5. | Some modulation parameters , such as the carrier frequency and the symbol rate , can be estimated prior to the recognition of modulation types . such other parameters as the modulation index , the modulation frequency deviation , and the signal broadband can be further estimated after recognition
部分调制参数如载波频率、符号速率在识别之前获得，在识别完成之后可以进一步估计调制指数、调制频偏、信号带宽等其余参数。 |
| 6. | This paper simulates and analyses the torque pulsation because of the modulation frequency and speed variation under ambipolar pulse width modulation ; the influence of snubber circuit , dead time effects , and modulation frequency to igbt pwm inverterbridge is taken into account , too
本文对双极性调制的无刷直流电动机仿真，分析了转速和调制频率对转矩影响；并综合考虑缓冲电路、控制死区及载波频率对pwm逆变电路中igbt开关损耗的影响。 |
| 7. | Sigma delta modulation frequency synthesis is an advanced technology that applies in pll ( phase - locked loop ) frequency synthesizer , which could transform the spurs created by fractional - n synthesizers into phase noise that could be filtered by inherent low - pass identity in pll
此技术应用-调制将锁相环频率合成器中分数分频器产生的相位杂散转化为相位噪声,通过锁相环本身低通滤波特性滤除,从而使用单环即可获得很高频率分辨率和极低的相位杂散。 |
| 8. | The system can generate three - phase spwm pulses and has following characters : the range of modulation frequency is from 0 khz to 4 khz . and can be divided to 7 classes to control . the carrier frequency may be selected up to 24 khz , and can be divided to 8 classes to control ; rotational frequency is defined to 16 bits
该系统能产生三相六路正弦脉宽调制( spwm )波形;调制频率范围为0 4khz ,分7级控制; 16位的速度控制分辨率;载波频率分8级控制,最高可达24khz ;系统接口兼容intel系列和motorola系列单片机;该系统控制简单、精确,易修改,可现场编程;同时具有脉冲延时小、最小脉冲删除、过压和过流保护功能等特点,可应用于pwm变频调速系统的全数字化控制。 |
| 9. | The principle advantages of vcsels over conventional edge - emitting lasers lie in ultralow threshold current , small far - field divergent angle , high modulation frequency , potential for wafer level testing and the ease for single longitudinal mode operation and two - dimension integration . as a result they show considerable promise for applications such as optical fiber communication , parallel optical interconnects , optical information processing and neural networks , etc . a direct coupling theoretical model in quasi - three - dimension for the gain - wave guide vertical - cavity surface - emitting lasers has been created in this paper
它与传统的边发射激光器相比具有更优越的特性，例如，具有极低的阈值、较小的远场发散角、调制频率高、易实现单纵模工作和二维集成，无须解理封装即可进行在片测试等，所以，它被广泛应用于光纤通讯、并行光互联、光信息处理、光神经网络等领域。 |
| 10. | A comprehensive theory is presented for fm spectroscopy of doppler - broadened molecular iodine absorption lines . the relationship betwcen fm spectroscopy and modulation frequency and modulation index has been studied . the whole circuit for thc frcquency stabilized laser system has been developed
建立了多普勒加宽碘分子线性吸收fm光谱的一般理论，对fm光谱与调制频率和调制度的关系进行了研究；并研制了532nmnd : yvo _ 4 / ktp碘吸收稳频激光器的电路系统；提出了虚拟激光稳频技术的概念。 |
