麻烦哪位朋友帮忙把下面这短话翻译成英文，在下谢过了

This alarm detects a human body the infrared, and by infrared sensors, signal amplifier circuit, voltage comparator delay circuit and acoustics, alarm circuit etc. When people enter the alarm surveillance area, can alarm sound, suitable to family, office, warehouse, laboratory, are important occasions security alarm. Summarizes the infrared radiation of knowledge, pyroelectric infrared sensor structure and work principle. Pyroelectricity infrared sensor design, a passive infrared alarm circuit, analyzed the function and working principle of the circuit. Pyroelectric infrared sensor has a lot of advantages, in security, alert in the device such as are widely used.

Keywords: infrared pyroelectric Fresnel lens effect