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为改进红外锁相热成像检测中的热调制激励效果,提高系统集成和使用性能,引入了数字功率控制技术。以可控硅为功率元件,推导控制角与功率的关系。以正弦调制激励为例,通过数值计算求解控制角随时间的变化规律,基于数字电路设计导通角控制算法和实现方法建立了实验平台并进行了实验验证和对比。结果表明:该方法的功率控制精度高,热成像波形的保真度明显优于常规激励技术,体积和结构也得到改善,电磁安全性满足要求,可以更好地应用于红外锁相热成像检测中。
In order to improve the thermal modulation excitation effect in infrared lock-in thermal imaging detection and improve the system integration and usability, digital power control technology is introduced. Using thyristor as power component, the relation between control angle and power is derived. Taking sinusoidal modulation excitation as an example, the changing rule of control angle with time was solved by numerical calculation. The experimental platform was established based on the digital control algorithm and the method of conduction angle control. The experimental verification and comparison were also made. The results show that the proposed method has the advantages of high power control precision, fidelity of thermal imaging waveform is better than conventional excitation technology, volume and structure are also improved, electromagnetic safety meets the requirements, and can be better applied to infrared phase-locked thermal imaging detection in.