Generalized Phase Processing With Application In The Physical Measurements

Phase process theory refers to the phase relationship between periodic signals, phase comparison, phase detection, etc. It plays an important leading role in the measurement of time, frequency and other physical quantities. The phase relationship is the basis of the phase process theory. It refers to the lowest common multiple period, the highest common factor frequency, the quantization phase shift resolution, the group period and other concepts. The phase comparison and detection are the approaches to apply this theory to the measurement and control. The phase process theory, combined with the group synchronization phenomenon is widely used in the time and frequency areas. Besides the area of time and frequency, the phase process theory can also be applied in the measurement of other physical quantities.This paper analyzes the specific application of phase process in the frequency and phase difference measurement. The measurement of length and its variation and sound velocity is also simply introduced. The frequency measurement precision greatly affects the other works in the time and frequency area. Different from the traditional methods, the frequency measurement method proposed in this paper applies the phase synchronization concept to the formation of the measurement gate, and the counting error is eliminated. According to the experiments, the measurement precision of this method can reach 1210 / s-, and the structure is simple. In the field of aerospace, phase difference measurement plays an important role in phase and time synchronization and real-time phase observation. The phase difference measurement method in this paper introduces the mesomeric source which is separately compared with the reference and measured signals. The measurement gate is formed according to the two phase synchronization, and the counting error in the traditional methods is eliminated. Confirmed by the experiments, the measurement precision of this method can reach 10 ps, and the structure is simple. The circuit of the phase difference measurement has one more shaping and amplifying circuit and phase coincidence detection circuit than the circuit of the frequency measurement does. In the measurement of length and its variation, the length quantity is converted to the voltage quantity according to the time-length conversion relationship. The length measurement is realized by measuring the voltage. The measurement precision can reach millimeter level. The measurement ofsound velocity is realized according to the spreading characteristics in the air of the sound wave and its natures, and the measurement error is in 0.5%. In the measurement, the spreading distance is changed and the phase change is observed by an oscilloscope. Then the wave length is obtained, and the measurement of sound velocity is realized. In the data process, the method of successive minus is adopted. This further illustrates that the phase process technology can be widely used in the physical quantity measurement. It is a new thought to combine the measurement of the quantity with the phase process technology, and it will be an inevitable development trend in the measurement field in the future.