High-accuracy segmented pulse generation method for temperature control

Abstract

The invention relates to a high-accuracy segmented pulse generation method for temperature control. Binary PWM (Pulse-Width Modulation) long pulses are decomposed into a plurality of short pulses, thereby fulfilling the aim of segmented heating, and avoiding damage to a heating plate due to a large temperature fluctuation change under the situation of over-concentrated heating time, as shown in Fig 1. The segmented pulses are short, thereby lowering the temperature control accuracy compared with non-decomposed pulses. Specific to the problem, the plurality of short pulses are counted and subjected to a closed-loop feedback in order that decomposed low-order phase information is uniformly applied to each short pulse, thereby realizing a high-accuracy and uniform-heating pulse generation circuit.

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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