Development of a surface respond parameters measurement of low responsibility detector

摘要

A new detecting system of low responsibility detector surface respond is introduced. The testing principle of detector surface respond detecting by laser modulation is given. The instrument consists of a modulation laser, focusing optical system, a week current amplifying circuit, two dimensions movement flat, the data acquisition, computer interface circuit and related software. The critical part of instrument is a focusing optics system with Φ5mm aperture and a narrow frequency amplification with 1 MHz frequency. The interface chip of USB is CY7C68013-128TQPF which controls the sampling of the signal and disposing data. The CPLD controls modulating laser, FIFO time and two dimension flat. The result of experiment indicates that the system offers an excellent way for selecting detector of good characteristic and analyzing detectors' respond characteristic. Also it can be used to detect manufacturing, apply heat detector and analyze characteristic of heat detector fields.