Uses innovative radar technology to measure speed, water level and flow
2023-05-28 22:24:22, SOMMER Messtechnik GmbHSOMMER's innovative Doppler radar sensors with high performance for water flow, water level hydrology, water resources, wastewater monitoring, unique snow and snow water equivalent, meteorological monitoring technology and user-friendly systems for data management and telemetry are proof of the company's unique innovative spirit. Far from any infrastructure and remote and harsh environments SOMMER's equipment enables sensing and monitoring systems for environmental parameters, such as weather stations for environmental monitoring in alpine regions, are reliable manifestations of SOMMER's reliable products and superb technology.
RQ-30 Flow Sensor
RQ30 surface flow sensor applies a new generation of microstrip flat antenna, it is on a thin media base (such as Teflon glass fiber pressure layer), one side attached to a thin metal layer as a grounding plate, the other side with photolithography etching and other methods to make a certain shape (parallelogram or triangle) of the metal patch, the use of microstrip lines and axial probes to the patch feed, which constitutes a microstrip flat antenna.
Features and advantages
Small size, light weight, low profile, can be conformal with carrier (such as aircraft).
Diversified electrical properties. Different designs of microstrip elements, the maximum radiation direction can be adjusted from side shot to end shot range; easy to get various polarizations.
Easy to integrate, can be integrated with active devices and circuits into a unified assembly.
Good detection accuracy, less influenced by the environment.
Application of single sensor 3-dimensional beam sparse subband can achieve multi-purpose detection, such as simultaneous detection of flow velocity, water level, rain intensity.
The flat microstrip system emits a very short microwave pulse of 1ns, and measures the running time of the pulsed microwave time of flight through the 3-dimensional sparse subband velocity, distance like algorithm and time domain signal spreading method, and simultaneously measures the environmental signal (rain), and calculates the velocity by DSP compensation method according to the environmental signal noise.
SOMMER RQ30 uses linear polarization and has good resistance to rain and snow. Specifically: first, the linearly polarized wave is not affected by reflection, so it does not produce phase changes after reflection and does not affect reception; second, in the case of obstacle occlusion, on the back side of these obstacles linearly polarized wave bypassing ability is stronger than circularly polarized wave; third, the linear polarization of the smaller polarization loss is more conducive to acceptance.
Bypassing ability of the transmitting frequency: in fact, this is the ability to resist rain and snow interference. Microwave waves in the propagation path when encountering obstacles, always try to bypass the obstacle, and then forward propagation. This phenomenon is called the microwave bypass. It is known that the bypassing ability of ultra-short waves is weak, and the so-called "shadow zone" will be formed behind tall buildings. However, the signal quality is affected not only with the receiving antenna distance from the obstacle and the size of the obstacle, but also with the frequency. The higher the frequency, the larger the obstacle, the closer, the greater the impact. On the contrary, the lower the frequency, the smaller and farther the obstacle, the smaller the impact. Therefore, the 24GHZ frequency is much stronger than the 36GHZ frequency against rain and snow interference.
Power consumption: SOMMER RQ 30 power consumption is small. RQ 30 uses high Q value (5000-10000) microwave dielectric resonant oscillator as the frequency stabilizing element, compared with Geng effect oscillator, with low phase noise, high frequency stability, easy to tune, low power consumption outstanding features.
SOMMER RQ30 comes with FTT Fourier transform function software, can be Fourier transform of the echo signal, the echo signal into the frequency domain for analysis, which not only reflects the structural characteristics of the echo signal, and can make fast convolution, target identification and many other algorithms easy to implement is an important and effective means of analysis in the echo signal processing.
SOMMER RQ30 directly on the motherboard integrated waterproof RS485 standard interface, the use of transparent RS485 port communication protocol, in terms of direct access to telemetry systems.
Technical parameters
1、Product type: flat plate radar (the latest generation) irradiation distance greater than 200 meters
2、Measurement principle: Doppler
3、Adapted to the direction of water flow: downstream, counter-current optional
4, river / channel type optional: 1) very gentle consistent water 2) general gentle river / channel 3) general river / channel 4) turbulent river / channel 5) very turbulent river / channel 6) splash water
5、Adapt to climate conditions: all-weather work, suitable for working in heavy rain and snowstorm, no rain failure
6、Control mode: hardware trigger, software protocol parallel control, free start and stop measurement action
7, radar band and frequency: Ka band; 24.160 GHz8, data acquisition time: 0 to 240 s adjustable
9, measurement interval setting range: work mode 1: 8 s to 5 h adjustable; work mode 2: external device hardware trigger work mode 3: RS484, SDI-12 port command
10, a measurement in the flow data output mode: 1) moving average 2) remove the average of large numbers 3) minimum value average 4) median average
11、Radar beam angle: 6.5°x 5.5º @ -3dB point, transmitting power 50 mW.
12、Radar vertical angle adjustment range: 30-60° (automatic compensation), conventional flow measurement direction angle: 58-61 degrees
13、Vertical angle tracking resolution and accuracy: resolution 0.1°; accuracy 1°
14、Radar horizontal direction angle: can be set
15, radar probe distance from the water surface: 0.5 m to 30 m (maximum installation height 100 m)
16, flow measurement range: 0.15 m to 15 m / s water level measurement: conventional 15 m, 30 m or 70 m, 26 GHz (K-Band) pulse time of flight measurement
17、Resolution and error: ±0.02 m/s; ±1 %
18, analog interface: 4-20 mA, can access to integrate water level, temperature, weather, environment and other sensors
19, digital interface: RS232; RS-232 (TTL); RS-485A; RS485B (1200 Baud --115200 Baud); SDI-12 (1200 Baud)
20, transmission baud rate: 1200-19200021, automatic output results: flow rate, section average flow rate, surface real-time flow rate, water level, signal-to-noise ratio, section area, etc., can set a variety of communication protocols. Flow accuracy: in the cross-section regulation flow velocity distribution has been the case to achieve a class of station measurement accuracy
22、Restart working mode: 1) hard restart: remove all the historical data in the cache of the last measurement to start calculating the current flow rate with new data; 2) soft restart: retain all the historical data in the cache of the last measurement combined with new data to start calculating the current flow rate; 23、direct graphic display of signal quality
24、Automatically generate different water level level comprehensive K-value table, section K-value line, comprehensive flow rate, water level, flow process line, section siltation change alarm
25, cross-sectional sub-water level refinement of the rate of precise adjustment of the decimal point, the cross-section of different riverbed quality according to the actual distribution of the width of the division, respectively, according to its nature to determine the roughness. Then, then their respective corresponding overwater area as the weight, weighted average to find out the average roughness, according to the vertical line location roughness, plus its left and right sides between high and low roughness through the impact of water flow gradient force, and finally using the method of reasoning plus experiment to derive the roughness formula.
26、RQ30D：For the complexity of the section, can be a host command another with the same type of radar flow measurement system joint synchronous work. rq-commander modeling software complex different sub-section synthetic flow software.
27、Power source: 5.5 - 30 VDC
28、Power protection: with power supply misconnection and overvoltage protection function
29、Current: maximum 130 mA (when measuring)
30、Dormancy: less than 1mA
31、Operating temperature: -35℃~+60℃
32、Storage temperature: -40 ° C ~ 60 ° C
33、Built in lightning protection standard: 0.6 kW Ppp
34, Field protection level: IP 68
35, anti rain interference: in 250 mm / hour rain intensity or greater conditions, flow data stability consistency
36、Self-learning function, in the absence of actual data in the case of extrapolation of water level flow relationship, extrapolation of flow.
Escenarios de aplicaciónEl RQ-30 es capaz de medir el caudal en ríos, arroyos, canales abiertos y canales donde se requiera una monitorización continua. Gracias a la tecnología de radar sin contacto, el dispositivo de medición no se ve afectado fácilmente por la contaminación, los residuos o la madera flotante en el agua. Además, la medición sin contacto garantiza un mantenimiento muy reducido y un funcionamiento a prueba de fallos, especialmente durante crecidas o inundaciones.
Medición continua in situ del servicio hidrológico del Rin fijo
El servicio hidrográfico del estado federado de Vorarlberg (Austria) es responsable de la medición del caudal del Rin. La medición del caudal debe realizarse registrando continuamente el volumen de agua (nivel del agua, tasa de descarga) y, en particular, determinando con precisión el caudal en situaciones extremas causadas por inundaciones. Por lo tanto, los sensores deben instalarse de forma segura en un lugar donde no puedan ser dañados por escombros o madera a la deriva para evitar daños en los sensores. La instalación sencilla y rentable en el puente y la posibilidad de activación son otros requisitos importantes para el sistema de medición.
El sensor de radar de descarga RQ-30 mide la velocidad y el nivel del agua en el Rin -sin contacto y, por tanto, sin mantenimiento- y calcula automáticamente la descarga actual en m³/s. El sistema está instalado en la base del puente principal del pueblo de Hoechst, sobre el Rin, donde está protegido de la crecida y las inundaciones. El RQ-30 es fácil de instalar y es un instrumento de medición de caudal robusto y fiable. Como resultado, se pueden obtener datos precisos del caudal incluso en acontecimientos extremos, como la inundación de 2005, que se produjo una vez en un siglo.
Disponible inmediatamente después de su puesta en funcionamiento, el RQ-30 no requiere ninguna actividad que requiera mucho tiempo para obtener curvas de caudal. Mediante la recogida continua de valores de velocidad y nivel del agua y el cálculo del caudal en el lugar de medición, se puede analizar la relación entre el nivel del agua y el caudal (h/Q) y la velocidad y el nivel del agua (v/h). Además, los cambios en el lecho del río pueden deducirse de los cambios en estas relaciones y el caudal puede modificarse en consecuencia. De este modo, mediante el control continuo de los caudales se pueden cuantificar con precisión los índices de descarga.
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