SOFTWARE FOR PULSED & FT ESR SPECTROMETERS

这个子项目是许多研究子项目中利用 资源由NIH/NCRR资助的中心拨款提供。子项目和 调查员(PI)可能从NIH的另一个来源获得了主要资金， 并因此可以在其他清晰的条目中表示。列出的机构是 该中心不一定是调查人员的机构。 在PULSE和FT ESR仪器开发的当前阶段，软件问题成为必要和耗时的问题。它们包括：为嵌入式微处理器编写硬件级代码，为MS Windows操作系统编写驱动程序，友好直观的用户界面，数据采集和处理软件，以及脚本解释器。我们编写了以下Win32应用程序：用于代码下载和与控制我们的定时系统的SHARC DSP通信的程序；以及用于在工作台硬件测试中使用的新定时系统中设置时间间隔的程序。Win32控制台版本的数据采集软件是为现有的X/Ku波段FT ESR光谱仪编写的，其时序基于流行的DG535延迟发生器。数据采集由Acqiris AP240 1Gsps暂态信号平均器提供。此外，还开发了脉冲序列校准和校正程序。其目的是考虑从编程值到TWTA输出的路径上累积的时序误差。脉冲序列目前由4Gsps 1.5 GHz数字示波器捕获。我们计划使用1 GHz的AP240模数转换卡来为数字信号处理器建立查找表，以便对脉冲序列进行相应的校正。在这种情况下使用Acqiris卡将需要增加射频开关来控制电桥输出和射频探测器之间的ADC输入，并为ADC时钟实现2 GHz的外部时基，以确保精确的定时。开发最后阶段的Visual C图形用户界面程序将使用Acqiris AP240双通道1 GSPS ADC平均器和新的定时硬件提供脉冲序列设置和数据采集。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. At the current stage of instrumentation development for pulsed and FT ESR, software issues become necessary and time-consuming matters. They include: writing hardware level code for embedded microprocessors, drivers for MS Windows operating systems, friendly and intuitive user interfaces, data acquisition and processing software, and script interpreters. We wrote the following Win32 applications: program for code download and communication with the SHARC DSP that controls our timing systems; and programs for setting time intervals in new timing systems that are used in workbench hardware testing. The Win32 console version of data acquisition software was written for the existing X/Ku-band FT ESR spectrometer, whose timing is based on popular DG535 delay generators. Data capture is provided by an Acqiris AP240 1Gsps transient signal averager. In addition, a program for pulse sequence calibration and correction is developed. Its purpose is to account for timing errors accumulated on the path from the programmed value to the TWTA output. The pulse sequences currently are captured by 4Gsps 1.5 GHz DSO. We plan to make use of a 1 GHz AP240 ADC card for building look-up tables for DSP, which will correct pulse sequences accordingly. Using the Acqiris card in this regime will require adding RF switches to steer the ADC inputs between the bridge outputs and RF detector and implementing a 2 GHz external time-base for ADC clocking in order to guarantee precise timing. The Visual C++ GUI program in the final stage of development will provide pulse sequence set up and data acquisition using Acqiris AP240 dual-channel 1 Gsps ADC averager and new timing hardware.