It depends on the way in which much wind you measure. If the wind speed is small, you need to use thermal wind speed and direction sensor or ultrasonic wind speed and direction sensor. If the wind speed is high, you can use wind cup sensor with a wind vane to measure.
The above three kinds of sensors can output wind speed and wind direction at the same time. Among them, wind direction measured by ultrasonic and thermal sensors is three-dimensional, and the wind direction measured by vane is two-dimensional.
In addition, if the wind direction output is not needed, the universal thermal wind speed sensor can be used. It has no direction output, but it can measure the wind in any direction.
Principle of measuring wind direction with self-made simple wind vane
Principle of measuring wind direction with self-made simple anemoscope:
The sensor is a mechanical rotary sensor, which can sense the air flow 11m away from the ground, detect and photoelectric transform the air flow speed and direction, conduct digital quantization, time averaging, storage and other processing, and then transmit to the indoor meteorological observation station through the communication equipment and routing of the system. Indoor data processing station (DPU) calculates and makes a 2-minute average wind speed and direction report. Based on the sensor’s 5-second wind data, the report of just and variable wind direction is generated, and the vector wind is decomposed in the direction of runway and vertical direction.
Those preparations should be made when installing wind direction sensors
Preparation for installation of wind direction sensor:
1. To determine the installation position of the wind direction sensor, the installation position should avoid obstacles and choose a higher position as far as possible.
2. The length of the connection line shall be established according to the distance between the wind direction sensor and the terminal equipment. If the line is already too long, the cost of the line can be saved by wireless transmission.
3. After determining the connection line of the sensor, an overall planning should be made for the line of the wind direction sensor, and the line should be simplified as much as possible to reduce the maintenance cost in the subsequent stage.
4. The wind direction sensor in some areas should be well protected from lightning, especially the installation of lightning rod facilities, to prevent lightning damage to the sensor as far as possible.
5. Before installation, we should make a good maintenance plan and assign maintenance personnel. Non-professionals should just try to maintain the sensor.
6, if there is a certain amount of water around the location of the sensor or the air is too humid, should be prepared to waterproof and moisture-proof work.
7. Check whether combustible and explosive materials exist in the location where the sensor is mounted.
How to design a wireless sensor array to detect the temperature field and wind speed field of air-cooled island
There needs to be a procedure alignment
The sensor is a kind of detection device, which can feel the measured information, and can transform the felt information into electrical signals or other required forms of information output according to certain rules, so as to meet the requirements of information transmission, processing, storage, display, recording and control.
Characteristics of sensors include miniaturization, digitization, intelligence, multi-function, systematization and networking. It is the first stage to realize automatic detection and control. With the existence and development of sensors, objects have senses of touch. Taste and smell, and gradually become alive. Generally, according to its basic perception function, it can be subdivided into ten categories: thermal sensor, light sensor, gas sensor, force sensor, magnetic sensor, moisture sensor, sound sensor, radiation sensor, color sensor and taste sensor.
Main ventilator CO sensor gas sensor wind speed sensor installed in the duct is not conducive to maintenance, can you adjust the position, to what place?
It can be adjusted appropriately. As long as the measured data in that paragraph is true and reliable. The total back is generally within 50 from the mouth can be.
How does an automatic weather station measure wind direction and speed?
Automatic weather stations usually use wind speed and direction sensor to observe the change of wind, the wind speed and direction sensor with better quality recommends you to use square big cloud, is specialized in automatic weather station equipment manufacturers, but also provide a variety of industry-level automatic weather station.
Is it necessary to install wind speed sensor in the air inlet roadway of underground working face?
Need.
In robot automation technology, rotational motion velocity is often measured, and linear motion velocity is often measured indirectly through rotational velocity. A tachometer generator, for example, is a speed sensor that converts rotational speed into electrical signals. The tachometer requires a linear relationship between the output voltage and the speed, and requires that the output voltage gradient. Time and temperature stability are good. The tachometer can be subdivided into direct flow type and alternating current type. The excitation mode of absolute current tachometer can be divided into separately excited type and permanent magnetic type. The armature structure has grooved, hollow, plate printed circuit and other forms, among which the grooved type is the most frequently used.
How does the anemometer work and how does the anemometer work?
1. Principle of anemometer:
The basic principle of the anemometer is that a thin metal wire is enclosed in a fluid and heated by an electric current, making its temperature higher than that of the fluid. Therefore, the wire anemometer is called “hot-wire”. When the fluid flows through the wire in a vertical direction, it will take part of the heat away from the wire and cause the wire temperature to clear. Ac
cording to the forced convection heat exchange theory, the relation between the heat Q dissipated by the hot-wire and the velocity v of the fluid can be derived. Wire is usually constructed of platinum, rhodium, tungsten and other metals with high melting point and good ductility. Common wire diameter 5 m, length 2mm, minimum probe diameter 1 m, length 0.2mm. According to different USES, the hot wire probe is also made into double wire, triple wire, oblique wire and v-shaped, x-shaped, etc. In order to increase the strength, sometimes use metal film instead of metal wire, usually in a thermal insulation substrate coated with a thin metal film, known as hot film probe. The hot-wire probe must be adjusted before use. Static calibration was conducted in the specialized standard wind tunnel, measuring the velocity and the relationship between the output voltage and drawing standard curve, dynamic calibration was conducted in the pulsating flow field is known, or in the anemometer heated circuit and a pulse signal, check the frequency response of hot-wire anemometer, if poor frequency response available corresponding compensation circuit to improve them.
The velocity measurement range from 0 to 100m/s can be divided into three sections: low speed: 0 to 5m/s; Medium speed: 5 to 40m/s; High speed: 40 to 100m/s. The thermal probe of the anemometer is used for the accurate measurement of 0 to 5m/s, and the rotary probe of the anemometer is used for the optimal measurement of the velocity of 5 to 40m/s. The pitot tube gives the best results at high speeds. An additional criterion for the correct selection of anemometer velocity probes is temperature, usually the temperature of the thermal sensor of the anemometer is approximately + -70c. The spinner probe of the special anemometer can reach 350C. Pitot tubes are employed to +350C and above.
2. Anemometer usage:
1) observe whether the pointer of the electricity meter point to zero before use. If there is deviation, the mechanical adjustment screw of the electricity meter can be adjusted gently to return the pointer to zero.
2) put the correction switches in the broken position.
3) insert the measuring rod plug into the socket, the measuring rod is placed vertically upward, the screw plug is pressed to make the probe sealed, the “correction switch” is placed in the full position, and slowly adjust the “full adjustment” knob to make the meter pointer point to the full position.
4) place the “calibration switch” at the “zero position” and slowly adjust the “coarse adjustment” and “fine adjustment” knobs to make the meter pointer to the zero position.
5) after the above steps, gently pull the screw plug to expose the measuring rod probe (length can be selected according to the need), and make the red point on the probe face the wind direction, according to the meter reading, check the correction curve, you can find out the measured wind speed.
6), after measuring several minutes (about 10min), the above steps 3 and 4 must be repeated once to standardize the current in the meter.
7) after the test, the “calibration switch” shall be placed in the inoperative position.
Installation method of coal mine wind speed sensor
The section is regular, as far as possible in the middle of the roadway, and there is no turning and no debris in the roadway within 10 meters before and after, and the direction of the arrow indicated by the sensor is connected, and the transmission line can be connected.
What is the wind speed transmitter?
A wind speed transmitter is a device that converts a wind speed signal into a correspondingly sized analog voltage or current signal.
Wind Sensor 