基于柯氏音法与示波法结合的新型血压测量系统

本文提出了柯氏音法与示波法结合的新型血压测量方法,深入研究了柯氏音信号的综合处理方法。其中有效特征实时抽取算法大幅度降低了信息存储量;示波法粗测与柯氏音法精测相结合,保证了测量值的稳定性和准确性。最后开展了血压测量实验,运用研发的新型血压测量系统进行人体血压自动测量,测量结果与人工测量法对比,人工测量值标准差是大于自动测量值的标准差,证明该系统具有较高的准确性。     

飞秒激光频率梳测距综述

精准的距离测量对于卫星编队飞行、行星空间定位、大型结构形状测量、微小位移测量以及工业制造测量等方面具有重要意义。近年来,基于飞秒激光频率梳的测距技术以其测量速度快、准确度高等优点成为国际研究热点。在简要阐述飞秒激光频率梳原理特性基础上,分析了目前国内外主要的飞秒激光频率梳测距的原理及测距结果,包括飞行时间法、多波长干涉法、双频率梳法、空间色散干涉法、实时色散傅里叶变换法以及多技术综合测距法。简要介绍了在测量过程中对空气折射率修正和色散补偿方法,对各类测距方法进行了对比总结,着重介绍了基于飞秒激光频率梳的测距最新研究进展。     

数字电视的测量

本文论述了加强数字电视信号测量的必要性，简要介绍了数字电视测量与模拟电视测量的区别，概要介绍了数字电视测量的特点和基本方法，并结合作者的工作实际对数字电视的测量尤其是MPEG－2／DVB码流和串行数字分量信号的测量进行了重点介绍，提出了立足现有条件进行数字电视信号测量的可行方法，并提出了进一步改进的建议。     

市话电缆故障脉冲测量法可行性探讨

本文简要介绍了脉冲法在电缆线路障碍测量中的应用,对将该法用于市话电缆障碍测量的可行性进行了论证。     

一种实用的高精度时间间隔测量方法

简要介绍了目前通用的几种时间间隔测量方法，并结合工程实践，描述了时延法测量时间间隔的原理和具体实现方法，并给出了实验结果。     

BP神经网络在比色法测温系统标定中的应用

红外辐射特性测量是导弹预警和识别的主要手段,相关研究具有较大的军事应用价值.目标的表面温度测量是红外辐射特性测量的基础.简要介绍了基于比色法测量目标表面温度系统的原理和结构,推导了表面温度测量模型并详细介绍了测温过程.分别使用最小二乘法和BP神经网络方法对测量数据进行处理,与最小二乘法相比,BP神经网络具有精度高、通用性好等特点.     

主动式光学三维成像技术概述

简要介绍了三维成像的基本概念,综述了常用的主动式光学三维成像技术的基本原理,包括基于几何法的三维几何法成像及基于时间测量的三维成像激光雷达:连续波法(位相法和FMCW法)及脉冲法.简单讨论了各种成像方法的优缺点及应用范围,并简要介绍了各种技术的应用.     

衍射法测量介质的折射率及其应用

简要介绍用光栅衍射法测量固体、液体介质折射率方法的原理、装置和实验结果,分析了这种方法的     

超声技术在变压器局部放电检测中的应用

对比了变压器局部放电的几种检测方法,简要介绍了利用超声技术测量变压器局部放电的原理,详细阐述了变压器局部放电超声定位系统的设计方法。结果表明,利用超声法测量变压器局部放电比其它方法更为有效。     

测量系统分析(MSA)及其软件设计

有效地实施测量系统分析是获得高质量的测量数据的关键。介绍了MSA的基本内容及其软件设计，给出了MSA软件的程序流程结构，简要介绍了软件的各功能模块。使用Visual Basic和Visual C^＋＋混合编程来实现MSA软件的设计，最后给出了采用均值一极差法和方差分析法进行R＆R评定的应用示例和线性分析示例。     

基于SOPC的智能电子血压计设计

针对以往电子血压计的不足,介绍了一种基于可编程片上系统(SOPC)的智能电子血压计的设计,血压测量的方法采用基于充气过程的示波法。该系统采用CycloneII系列低成本FPGA,并嵌入NIOSII软核作为核心处理器,可以完成自动测量血压、信息显示、数据存储、查看和删除历史数据等功能。由于采用了FPGA,从而简化了电路的设计,提高了系统的可靠性和稳定性,并且使系统具有较强的可扩展性,有利于系统的升级。     

基于充气过程的血压检测技术研究

传统的示波法均是在放气过程中测量血压,基于这种原理设计的血压测量系统功耗高,体积大,个体适应性差,难以满足动态血压监测低功耗和微型化的要求。本文研究了基于充气的自适应血压测量技术,克服了放气血压测量的缺陷,从而满足了动态血压监测的要求。     

基于MSP430单片机的电子血压计的设计

针对传统电子血压计的不足,介绍了一种基于超低功耗单片机的全自动血压测量系统的设计方案,测量血压的方法是基于充气过程的示波法。该测量系统采用MSP430系列超低功耗混合信号处理器作为核心处理器,采用幅度系数算法计算出血压值和心率值,可以完成自动测量血压、信息显示、数据存储、查看和删除历史数据等功能。由于采用了MSP430混合信号处理器,简化了电路的设计,提高了系统的可靠性和稳定性。实际应用表明,该系统具有操作简便、测试准确的特点,达到了设计要求     

便携式电子血压计连续动态监测的设计

设计了一种能够连续监测动态血压的便携式电子血压计。血压计测量方法采用示波法,以ATmega16单片机为核心,实现A/D转换、定时测量、数据存储、串口通信、LCD显示等功能,可用作偶测血压计,需要时能够连续全天24小时监测动态血压和脉搏。     

Improved tracking of limb occlusion pressure for surgicaltourniquets

Constant-pressure tourniquets are widely used to occlude blood flow into a patient's limb to facilitate the performance of a wide variety of surgical procedures. Adaptive tourniquets that automatically adjust the cuff pressure to the minimum necessary for occlusion (limb occlusion pressure) as a function of the patient's changing systolic blood pressure are expected to reduce the incidence of tourniquet-related injuries. However, these devices have not been widely used, largely due to problems in tracking the systolic blood pressure safely, accurately, and reliably in clinical environments with noise present. Initial lab trials and clinical trials compared the performance in tracking limb occlusion pressure during varying noise conditions of a typical oscillometric blood pressure monitor with that of a prototype system. The prototype system functions by detecting noise and rapidly estimating limb occlusion pressure using only data uncorrupted by noise. Results showed that the prototype consistently estimated limb occlusion pressure more rapidly, more accurately, and more reliably than the oscillometric monitor in noisy conditions typical of surgical procedures. The results also indicate that the prototype is feasible for incorporation into an adaptive tourniquet     

Electrocardiogram-assisted blood pressure estimation

Accurate automatic noninvasive assessment of blood pressure (BP) presents a challenge due to conditions like arrhythmias, obesity, and postural changes that tend to obfuscate arterial amplitude pulsations sensed by the cuff. Researchers tried to overcome this challenge by analyzing oscillometric pulses with the aid of a higher fidelity signal-the electrocardiogram (ECG). Moreover, pulse transit time (PTT) was employed to provide an additional method for BP estimation. However, these methods were not fully developed, suitably integrated, or tested. To address these issues, we present a novel method whereby ECG-assisted oscillometric and PTT (measured between ECG R-peaks and maximum slope of arterial pulse peaks) analyses are seamlessly integrated into the oscillometric BP measurement paradigm. The method bolsters oscillometric analysis (amplitude modulation) with more reliable ECG R-peaks provides a complementary measure with PTT analysis (temporal modulation) and fuses this information for robust BP estimation. We have integrated this technology into a prototype that comprises a BP cuff with an embedded conductive fabric ECG electrode, associated hardware, and algorithms. A pilot study has been undertaken on ten healthy subjects (150 recordings) to validate the performance of our prototype against United States Food and Drug Administration approved Omron oscillometric monitor (HEM-790IT). Our prototype achieves mean absolute difference of less than 5 mmHg and grade A as per the British Hypertension Society protocol for estimating BP, with the reference Omron monitor.     

Reduction of interference in oscillometric arterial blood pressure measurement using fuzzy logic

In oscillometry, oscillation amplitudes (OAs) embedded in the cuff pressure are drastically affected by a variety of artifacts and cardiovascular diseases, leading to inaccurate arterial blood pressure (ABP) measurement. The purpose of this paper is to improve the accuracy in the arterial pressure measurement by reducing interference in the OAs using a recursive weighted regression algorithm (RWRA). This method includes a fuzzy logic discriminator (FLD) and a recursive regression algorithm. The FLD is used to reduce the effect of artifacts caused by measurement motion disturbance or cardiovascular diseases, and to determine the truthfulness of the oscillation pulse. According to the truth degree, the relationship between the cuff pressure and OA is reconstructed using the regression algorithm. Because the regression method must utilize inverse matrix operation, which will be difficult to implement in an automatic or ambulatory monitor, the recursive regression method is proposed to solve this problem. To test the performance of this RWRA, 47 subjects underwent the ABP measurement using both the auscultation and the oscillometry combined with the RWRA. It was found that the average difference between the pooled blood pressures measured by the auscultation and those by the oscillometry combined with the RWRA was found to be only 4.9 mmHg. Clinical results demonstrated that the proposed RWRA is more robust than the traditional curve fitting algorithm (TCFA). We conclude that the proposed RWRA can be applied to effectively improve the accuracy of the oscillometric blood pressure measurement.     

基于MSP430的石油井下压力测试系统的设计

介绍存储测试理论,分析石油井下测试系统的工作原理。应用,并详细分析整个系统的状态转换。与传统的测压器相比,井射孔压力测试方面有更广泛的应用。在此基础上介绍MSP430单片机在此测试系统中的该测试系统具有体积小、低功耗等特点,这使其在油     

无人机光电平台技术指标设计方法

光电平台通常安装在飞机上,实施对地面目标或空间目标的跟踪,并给出目标的精确位置信息,是常规武器靶场和机载光电测量、光电跟踪中必不可少的设备。文中先简要介绍无人机光电平台在实际应用中的战术使用指标,然后根据无人机战术使用指标给出了设计光电平台技术指标的方法,并举例说明。     

基于蓝牙4.0的示波法电子血压计的设计与实现

平稳、健康的血压是人们维持机体正常新陈代谢的基本前提之一。近年来,随着人们生活方式、饮食习惯的改变,我国心血管疾病的发病率也随之不断上升,血压检测和便携式智能医疗设备逐渐成为了人们关注的重点,但目前市场上的电子血压计多以独立个体的形式存在,不具备数据传输功能,无法真正满足"个性化"医疗需求。因此,本文将以智能医疗中心为基础、将软件作为实现手段,探讨基于蓝牙4.0的示波法电子血压计的设计与实现,该血压计以示波法为原理,主要由Android端APP、下机位数据采集部分构成,通过蓝牙4.0进行数据传输。与传统电子血压计相比具有携带方便、测量便捷、稳定性强等优势,在家庭慢性病防控和血压检测中具有重要意义。