阵列探测器在成像光谱偏振探测技术中的应用

Application of array detectors in imaging spectrometer polarization detection technique

为了在成像光谱偏振仪中应用近红外焦平面阵列探测器,得到高质量图像信息,结合新型弹光调制型成像光谱偏振探测技术(PEM-ISP),提出了一种基于近红外焦平面阵列探测器的成像光谱偏振探测技术。系统采用FPA-640×512 InGaAs焦平面阵列探测器作为光学探测接收元件,采用高速现场可编程门阵列(FPGA)作为信号处理单元,做到对光学信号的快速采集与并行处理,满足高速、实时的信号传输与处理技术等要求。将经高速A/D采集得到的数据存储到FPGA外扩的静态随机存储器中,以保证数据的完整性。数据最终通过通用串行总线传至上位机,上位机通过LabVIEW实现图像还原。结果表明,该系统可以应用于PEM-ISP中,实现对测量信号的精确探测与采集,并得到完整的图像信息。

In order to apply near-infrared focal plane array detectors in imaging spectrometer polarization instruments to get the high-quality image information , a new type of imaging spectrometer detection techniques on basis of near -infrared focal plane array detectors was proposed combining with a photo-elastic modulator-based imaging spectro-polarimeter （ PEM-ISP） .A FPA-640 ＆#215;512 InGaAs focal plane array detector was used as an optical detector receiving element and a high -speed field-programmable gate array （ FPGA ） was used as the signal processing unit to get fast acquisition and parallel processing of the optical signal and meet the other requirements of the high-speed, real-time signal transmission and processing .The data collected by the high-speed A/D was storaged in the expanding outside SRAM of the FPGA in order to ensure the data integrity .And then, the data was ultimately transmitted to the host computer via USB for image restoration . The experimental results show that the system can be applied to PEM-ISP, achieve accurate detection and acquisition of the measurement signals and get complete image information .