Abstract：Based on the principle of continuous wave (CW) radar displacement measurement and the characteristics of strong radar wave penetration, the relationship between liquid level and radar wave intermediate frequency (IF) signal is established on the basis of establishing a relationship model between the propagation path and the radar wave signal strength, and a non-intrusive method of liquid level measurement of water flow in pipelines is proposed. Then the flow rate of water flow in gravity flow drainage pipes is calculated according to Manning formula, and the non-invasive drainage pipe flow measurement based on radar waves is realized. By comparing with the measurement data of the reference electromagnetic flowmeter, the experimental results show that the average error of the proposed non-intrusive flow measurement method is within 3.6%, which can meet the accuracy requirements of the flow measurement of the majority of gravity flow.
MA Y C, ZHAO W G, ZHANG S Y, et al. Study on Dynamic Threshold Method Based on Echo Similarity for Ultrasonic Gas Flow Meter[J]. Acta Metrologica Sinica, 2022, 43(4):482-488.
[2]
GERHART P M, GERHART A L, HOCHSTEIN J I. Fundamentals of Fluid Mechanics, 9th edition[M]. New York: John Wiley and Sons, Inc, 2018.
XIE Y, HUANG M, WANG C Y, et al. Improved algorithm for wide beam linear array radar level meter measurement[J]. Journal of Xidian University, 2021, 48(2): 165-172.
CHEN W M, LI C L. Radar-Based displacement / distance measuring techniques[J]. Journal of Electronic Measurement and Instrumentation, 2015, 29(9): 1251-1265.
TANG X Y, ZHANG Q D, WANG J L, et al. Research on Indoor Positioning System Based on Wireless Network Fine Time Measurement Technology[J]. Chinese Journal of Computers, 2022, 45(3): 567-584.
WU J H, LI C, WANG R, et al. The Slop Fitting Method of Sonar Point Cloud on the Inner Wall of Sewer Based on Density Algorithm and Tangent Slop Fitting of the Circle[J]. Acta Metrologica Sinica, 2023, 44(2): 232-237.
ZHANG H W, ZHANG L H, PENG H, et al. Research on cognition and calculation method of alluvial river roughness[J]. Journal of Hydraulic Engineering, 2020, 51(7): 203-207.
GUO Y X, GUO X L, YANG P Z, et al. Sensitivity analysis of the hydraulic conveyance coefficients of pips[J]. Journal of Hydraulic Engineering, 2019, 50(8): 1021-1028.
LI Q Q, WANG T Q, YU H Y, et al. Temperature Measurement of Fluid in a Tube Using a Microwave Cylindrical Cavity Resonator Sensor[J]. Acta Metrologica Sinica, 2023, 44(5): 714-721.
FENG Y Q, MIAO C, CHEN L, et al. Research on High-precision Micro Deformation Measurement System[J]. Journal of Microwaves, 2023, 39(S1): 281-284.
ZHAO Y Z, CHEN L Y, ZHANG F B, et al. A New Method of Joint Radar and Communication Waveform Design and Signal Processing Based on OFDM-chirp[J]. Journal of Radars, 2021, 10(3): 453-466.
ZHAO N, WANG C, WU L Q, et al. Measurement and Analysis of Phase Interface Parameters of Horizontal Pipe Section Plug Flow Based on Ultrasonic Phased Array Technology[J]. Chinese Journal of Sensors and Actuators, 2022, 35(7): 960-966.
AKGIRAY. Explicit solutions of the Manning Equation for Partially Filled Circular Pipes[J]. Canadian Journal of Civil Engineering, 2005, 32 (3): 490-499.
BI Y H, HUO J, L D R, et al. Ka&W dual-frequency millimeter-wave cloud radar at Yangbajing - Performance and comparison[J]. Journal of Infrared and Millimeter Waves, 2022, 41(2): 470-482.
2024, Vol. 45 
