A high-precision segmental pulse generation method for temperature control

Abstract

The invention relates to a high-precision segmental pulse generation method for temperature control. By decomposing the binary PWM long pulse into multiple short pulses to achieve the purpose of segmental heating, it can avoid the heating time being too concentrated, resulting in large temperature fluctuations and damage to the heating plate, as shown in Figure 1. Since the segmented pulse is shorter, the temperature control accuracy will decrease compared with the pulse before decomposition. In order to solve this problem, the present invention counts multiple short pulses and performs closed-loop feedback, and evenly adds the low-level phase information after decomposition. To each short pulse, a high-precision, uniform heating pulse generating circuit is realized.

Description

technical field [0001] The invention relates to the technical field of nuclear magnetic resonance gyroscope heating, in particular to a high-precision segmental pulse generation method for temperature control. Background technique [0002] Miniature nuclear magnetic resonance gyroscopes have the characteristics of small size, low power consumption, high performance, and large dynamic range, and have become the research focus and hotspot of new inertial devices. The performance of NMR gyroscopes is affected by the macroscopic magnetic moment of atomic nucleus spin, which is directly related to the atomic density of alkali metals. In order to improve the signal-to-noise ratio of the gyro, it is necessary to precisely control the temperature of the atomic gas chamber to reduce its fluctuation. [0003] In order to improve the control accuracy, the existing temperature control method uses a binary number with a long bit width for PWM control. The heating time of this control me...

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Problems solved by technology

[0003] In order to improve the control accuracy, the existing temperature control method uses a binary number with a long bit width for PWM control. This control method has a relatively concentrated heating time, which will lead to a large temperature oscillation range of the heating plate, which is not conducive to the stability of the final temperature.

When heating with long pulses, due to the relative concentration of heating pulses, the temperature of the heating plate will rise too fast, and when non-heating pulses occur, the temperature will drop sharply, causing the heating plate to overheat or even be damaged, and it also brings difficulties to temperature control. higher difficulty

However, if the PWM control method is controlled in segments, the bit width will be reduced. Without closed-loop feedback, the accuracy cannot reach the accuracy of high bit width, and the temperature control will also have large fluctuations.

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