In order to resolve problem of traditional fire detector

such as low measurement precision and slow response

an ultraviolet detector is designed based on flame.Detection principle and circuit of flame detector are analyzed.Circuit consists of UV sensor drive module

data processing module

communication and alarm module.The collected data is dealed with sliding window algorithm and judge flame signal from background noise

which improves sensitivity of system and reduces false alarm rate.Besides

sensitivity of fire detector can be changed to meet the needs of different environment.Experimental results prove that this flame detector has characteristics of good stability

fast response

high measurement precision and has high practical value.