Understanding Range Gated or Pulse Doppler 让我们了解一下 距离选通或脉冲多普勒技术

1. ADFM™ Family of Products ADFM™产品大家庭Gary N. Skipper, P.E.Flow Meter Marketing Manager流量计市场营销经理

2. Isco’s Marketing VisionIsco产品的市场营销愿景Obtain flow measurement data of the highest possible quality for every application and budget在每次应用和每笔预算中获得尽可能质量最高的流量测量数据 Provide our customers with a complete portfolio of accurate and cost-effective flow monitoring solutions for use in open channel, non-potable water applications. 向我们的客户提供一整套 精确而又经济的明渠、非饮用水流量监测解决办法。

3. UnderstandingRange Gated or Pulse Doppler让我们了解一下距离选通或脉冲多普勒技术

4. What is Pulse Doppler?什么是脉冲多普勒技术? • Originally a velocity profiling technology developed for the oceanographic and river communities 一种最初用于海洋和江河领域的速度剖面技术 • Part of the “proper” implementation of the Doppler principle for velocity measurement 把多普勒原理应用于速度测量的“恰当的”装置的一部分 • Transmit short, acoustic pulses rather than a long, continuous wave train 发射的是声学短脉冲而不是连续长波束

5. Why is Pulse Doppler Unique?为什么说脉冲多普勒技术是独一无二的? • The only method for measuring a true velocity profile 测量实际速度剖面的唯一方法 • Multiple v measurements removes need for in-situ calibration 多束的速度测量法无需原地校准 • PD allows measurement of very slow or zero velocity 脉冲多普勒技术能够用于极低流速甚至零流速的测量 • Measures flow rate accurately in large pipes or channels 能够精确测量大管径或大管道的流量流速

6. Pulse Doppler Terminology脉冲多普勒技术有关术语 • Transceiver 无线电收发器 • Acoustic pulse 声学脉冲 • PD vs. CWD 脉冲多普勒 vs. 连续波多普勒 • Bin 测速线 • Range-Gating 距离选通 • Narrow beam-width 狭窄的波束宽度 • Velocity components 速度分量 • Velocity distribution 速度分配 • Flow pattern 水流模型 • The “algorithm” 运算法则 • Basis functions 基本功能

7. ADFM™ - Velocity Profiling ADFM™ - 速度剖面

8. Flow Velocity Vector 速度向量 Vector Component 速度构成 Bin测速线 Velocity Vectors, Directionality, and Velocity Measurement速度向量，方向性，速度测量

9. ADFM Data from 5 m Pipe 5米管道的ADFM数据Louisville, KY肯塔基州路易斯维尔市

10. ADFM Accuracy Test ResultsADFM精确度测试结果 • US Bureau of Reclamation Water Resources Research Laboratory, 1.2 and 3.5 m wide channels - three separate tests 1.7%, 1.8% and 2.0% differences - 0.8% calibrated Venturi • Sacramento 3 m line - 1.8% difference - 2% dye test • Phoenix 1.2 – 2.2 m lines – 1% difference - 2% dye tests • Pima County WMD – 450 mm Flow Test Loop 1.5% difference - 0.25% NIST traceable meter • US Dept of Agriculture Water Conservation Laboratory 1.5% difference - 0.2% NIST traceable weight tank • Salt River Project - Arizona Canal 0.5% difference over 4 weeks - 2% calibrated weir

11. Summary - Velocity Profiling简要-速度剖面 • Most accurate, precise open channel velocity measurement method available 目前准确性和精确度最高的明渠流速测量方法 • In-situ calibration not required 无需现场校准 • Well suited for accurate flow measurement in difficult hydraulic conditions 非常适于在恶劣的水利条件下进行精确的流量测量 • Accurately measures very low, zero or reverse velocities 能精确测量极低速水流、静止流和逆流

12. Flow monitoring……application, application, applicationADFM能胜任各种条件下的水流监测 All of your existing applications, plus… 除了上述各种应用外，还有…… • Complex Hydraulics 复杂的水利条件 • Large Diameter Pipes 大管径 • Large Open Channels 大明渠 • Slow Flows 低速水流 • Difficult Installation or Calibration Conditions 安装或校准存在困难的情况

13. The ADFM Family of Pulse Doppler Products ADFM脉冲多普勒产品大家庭

14. 4 independent velocity beams 4条独立的流速波束 Ultrasonic depth measurement 超声波液位测量 Typical probe life 10 years 探头寿命长达10年 250 mm of water depth required to measure velocity 测量流速需要250 mm液位 ADFM™ Pro20 Transducer Assembly ADFM™ Pro20传感器系列

15. Velocity Profiling速度断面

16. Applications for ADFMADFM的各种应用 • Large pipes and channels with flow depths 1 – 6 meters 液位1-6米的大管径和渠道 • Collection systems 污水采集系统 • Treatment plant- influent, effluent and process control applications 污水处理厂－ 入水、出水和过程控制等各种应用 • Stormwater Outfalls 暴雨径流排水口 • Permanent monitoring sites 永久性监测现场

17. Basic Specification基本规格 • Velocity 速度 • Range: ± 10 m/s 量程± 10 m/s • Accuracy: 0.5% of reading ± 3 mm/s 精确度：0.5%，读数误差± 3 mm/s • Depth 液位 • Range 0.15 to 6 m 量程 0.15 to 6 m • Accuracy: 0.5% of reading ± 5 mm 精确度： 0.5%，读数误差± 5 mm • Flow Rate 流量 • Accuracy: 2% of reading 精确度：2%读数误差

18. accQmin™

19. accQmin™

20. Specifications 规格 • Accuracy is a function of depth 精确度取决于液位 50-150 mm 5% of reading 5%的读数误差 150-300 mm 3% of reading 3%的读数误差 > 300 mm 2% of reading 2%的读数误差 • Level Range 液位量程： 50 mm – 1 m. • Velocity 流速量程： +/- 5 m/s

21. Applications for the accQmin accQmin的各种应用 • Small pipes and channels with flow depths less than meter 液位低于1米的小管径和渠道 • Collection systems 污水采集系统 • Treatment plant- influent, effluent and process control applications 污水处理厂－入水、出水和过程控制等各项应用 • Permanent monitoring sites 永久性监测现场

22. H-ADFM宽明渠流量计 • Measures a horizontal profile across wide channels • 　　测量宽明渠的水平断面 • Horizontal profile detects variations in velocity across the flow • 　　水平断面可提供流速分布 • Operates in large width to depth aspect ratios – 10:1 • 安装在非常宽的明渠(宽度:液位-10:1) • Large, sensitive ceramics work well in very clean water (< 5 mg/L suspended solids) • 敏感的大压电陶瓷很适用于非常干净的水流中（悬浮体<5mg/L）

23. The H-ADFM - Large Channels大渠道H-ADFM

24. Specifications规格 • Velocity accuracy 0.5% ± 0.2 cm/s 流速精度 0.5% ± 0.2 cm/s • Profiling range of 20 m 剖面量程 20米 • Velocity Range +/- 10 m/s 流速量程 +/- 10 m/s • Level accuracy 0.5% ± 3 mm 液位精度 0.5% ± 3 mm

25. Applications for the H-ADFM H-ADFM的各种应用 • Large Channels (or pipes) > 3 m 大明渠（或管道） > 3 m • Where horizontal velocity variation is complex 水平流速复杂多变的环境 • “Clean” Water “干净”水 • Treatment plant effluent 污水处理厂出水 • Chlorine Contact Basins 有氯接触的水池

26. ADFM Hot Tap封闭管道流量计

27. Hot Tap Installation – Sensor can be installed while the pipe is in operation Hot Tap安装－可在管道运行状态下安装传感器

28. Typical Hot Tap Installation Hot Tap安装典型图示

29. Hot Tap Specifications Hot Tap规格 • Full Pipes 0.45 – 2.5 m 满管0.45 – 2.5 m • > 50 mg/l TSS 颗粒浓度> 50mg/L • Standard 50 mm tap and valve 适用于50mm标准旋塞和阀门 • AC or DC available 直流电或交流电 • Requires no routine maintenance 无需日常保养 • Max. Operating Temp – 350 C 最大操作温度- 350 C • Static Pressure: 350 kPa Nominal 　 静压：350 kPa 名义 • Flow Accuracy: 2% of reading 　 流量精度：２%读数误差

30. Applications for the Hot Tap Hot Tap的各种应用 • Force Main Influent to WWTP 污水处理厂入水口的压力干管 • Full Pipe for WWTP process 污水处理厂运行中的满管 • Pump Stations 泵站 • Any magmeter application for wastewater 直读式频率计在污水中的应用均能胜任