中文摘要：

为了实时准确地测量锅炉液位，在此提出一种新颖的液位测量方法，采用光纤作为信号传输媒介使测量现场远离电信号，首次采用激光进行锅炉的液位测量，利用相位激光测距原理，证明有较高的测量精度。详细叙述了系统设计原理，给出光路部分的设计，并对频率漂移、锅炉内部气体的折射率以及气体对激光的散射和吸收对测距的影响进行了分析，并给出了具体解决方法。与传统方法相比，该方法具有液位测量数据可靠，测量精度高，实时准确显示当前的液位高度和实时控制液位等优点。通过理论分析证明了该方法的合理性及可行性。

英文摘要：

In Order to measure the boiler liquid level accurately and in real - time, a novel measurement method for liquid level is proposed in this paper. By the use of optical fibers to transfer the optically encoded signal, the measurement spot is kept apart from the electronic processing system. And the laser is first adopted in boiler liquid level measurement. The measurement is made by the method of phase laser ranger finding which can obtain higher precision. The paper discusses the design principle in details and gives the design of the optical path. Also the effect of frequency drift and gas index and the scattering and absorption of gas on laser on measurement is analyzed. And some special solving methods is put forward. Compared with the traditional methods,the proposed method has the merits of reliable liquid level measurement data, higher measurement precision ,displaying current liquid level height accurately and controlling the liquid level in real time. Through theoretical analysis in detail ,rationality and feasibility of this method are proved.