含氮物質(zhì)檢測系統(tǒng)脈沖發(fā)射源及控制模塊的研制
[Abstract]:The existence of explosives can be recognized by detecting the resonance lines of the nuclear quadrupole moment of the 14N nucleus in nitrogen-containing materials. Each nitrogen-containing explosive has its own resonance spectrum, which corresponds to a fingerprint and is unique. Based on this characteristic, the signal source, power amplifier and control pulse module of nuclear quadrupole moment explosive detection principle prototype are developed in this paper. This paper first introduces the basic principle of nuclear quadrupole resonance, the excitation mode and the overall scheme of nuclear quadrupole resonance detection system. Secondly, according to the practical application frequency of nuclear quadrupole resonance, the radio frequency signal source and control circuit of nuclear quadrupole moment resonance detection system are designed based on DDS technology. On the basis of introducing the basic structure, working principle, advantages and disadvantages of DDS, the hardware and software circuit of DDS is designed and implemented according to the requirement of RF pulse in the system. In order to meet the need of transmitting power of nuclear quadrupole moment resonance detecting system, the circuit scheme of AB type power amplifier to realize power amplifier is presented on the basis of comparing the characteristics of various power amplifiers. The load traction technology is used to design the impedance matching network of the amplifier, but the hardware implementation of the amplifier is not completed because of the time. Finally, the signal source and pulse module of the whole detection system are made and debugged. The test results are as follows: (1) the signal source can output 3.41 MHz / 4.64MHz / 5.1938MHz signal. The output power is more than 10dBm, and the second harmonic suppression is 28dBc. (2) in the FID pulse sequence, the width of 90 擄pulse is 50usn 85us, the step is 5us. the interval period is 50ms / 800ms, the width of 0 擄pulse in the step 50ms.SE pulse sequence is 50usn 85usand the step is 5us. the width of refocus pulse is 150us-290us. step 20us. Has been implemented through the pulse control module. The output level is more than 3.3 V. The test results show that the designed module basically meets the expected requirements.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TQ560.7;TN78
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