JPH0269667A - Ionic wind speed meter - Google Patents

Abstract

PURPOSE:To measure the speed and direction of an ionic wind with high accuracy and responsiveness by detecting currents flowing to each ion collector provided on a circumference around a corona discharge line and calculating the speed and direction from detected current values. CONSTITUTION:Ion collectors 31-38 are provided on a circumference around a corona discharge line 1. A positive or negative DC high voltage of four to several tens kV is applied across the discharge line from a high-voltage power source 2. Ions generated by the corona discharge from the line 1 are uniformly generated in the circumferential direction and collected by each collector 3 after the ions are suitably made to flow by an ionic wind. As a result, the electric currents made to flow to the collectors 31-38 are detected by means of the current detecting section 61-68 of an arithmetic device 7 and the speed and direction of the ionic wind are calculated from the detected current values. Thus the speed and direction of the ionic wind can be measured with high accuracy and responsiveness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ion layer and a velocity meter for measuring wind speed and the like using ions generated by corona discharge.

[Prior Art] Wind speed measurement has become more diverse, and recently, responsive anemometers have been attracting attention. In order to increase responsiveness, it is essential that there are no moving parts, and for this reason anemometers have been developed using various principles. Ion anemometers also fall into this category, and measure wind speed from the movement of ion groups generated by corona discharge. Ion anemometers themselves have been proposed with various principles.

A conventional ion anemometer consists of a corona discharge wire in the center with ion collectors facing each other and aligned in the direction of wind flow.5 In this ion anemometer, when the wind speed is zero, In this case, the ions emitted from the corona discharge wire flow equivalently to the upstream ion collector and the downstream ion collector, but if there is wind speed, the ions heading upstream are flowed downstream, so the upstream side The wind speed can be detected by the difference between the current value flowing through the ion collector and the current value flowing through the downstream ion collector.

[Problems to be solved and attempted by the invention] However, although this ion anemometer can detect one speed of debris, it cannot detect up to one side of the screen, and the ion flow is upwind. Since the direction is downwind, there is a problem that the upstream ion collector and downstream ion collector must be accurately arranged with respect to the wind direction.9 The present invention was made in consideration of the above circumstances, and To provide an ion folding speed meter that can detect wind direction. [Means for Solving the Problem] In order to achieve the above object, the present invention provides a corona discharge wire and a plurality of It has an ion collector, a current detection section that detects the current value flowing through each of the ion collectors, and an arithmetic device that measures the wind speed and wind direction from the current value detected by the current detection section.

[Function] According to the above configuration, since the ion collector is provided on the circumference around the corona discharge wire, the ions generated by the corona discharge from the corona discharge wire are generated uniformly in the circumferential direction. 1. As a result of this being appropriately blown by the wind and collected by each ion collector, the current value of each ion collector can be detected and the wind speed and direction can be determined from each current value.

[Embodiments] Hereinafter, preferred embodiments of the present invention will be described based on the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a corona discharge wire installed vertically, and 9 connected to a high-voltage power source 2. With this corona discharge wire 1 as the center, 4 to 10 ion collectors 31 are arranged on the circumference.
~N is provided.

The second ion collectors 31 to 3N each have a lead wire 4
The lead wires 4 are connected to the current detection sections 6, . . . of the arithmetic device 7, respectively. This current detection section 6.
The detected values of −〇 are respectively input to the arithmetic device 7, and the arithmetic device 7 determines the wind direction and wind speed.

First, the corona discharge wire 1 and the ion collector 31-N are
As shown in FIG. 2, upper and lower supports 8 and 9 made of insulating material
held between. A mounting seat 1011 for the corona discharge wire l is provided at the center of this upper and lower support #8.9, and the mounting seat 1
A corona discharge wire 1 is stretched between 0.11 and ion collector 3 is placed on the circumference around the corona discharge wire
1-N are provided at approximately equal intervals. This lower support 9
A mark 12 indicating a direction such as north is provided, and this mark 12 is automatically directed to the set direction such as north.

The corona discharge wire 1 is made of, for example, a tungsten wire with a diameter of 0.1 m1yφ and an effective discharge length of 30 turns, and an ion collector 3. -N is made of a tungsten rod with a diameter lllInφ, and has a radius of 12 m around the corona discharge wire 1.
Eight pieces are provided at 45 degree intervals on the circumference of m.

The second corona discharge wire 1 is powered by a high voltage power supply 2 of 4 to several tens of K.
A positive or negative DC high voltage of V is applied 9. Each ion collector 31-N is provided on the outer periphery of the lower support 9.
Terminals 13 are provided corresponding to the terminals 13, and the terminals 13 are connected to the flow detectors 61 to 61 through the lead wires 4, respectively.
N, and the detected values are expressed as yf, respectively.
The wind direction and speed are input to the device 7, and the wind direction and speed are determined by the arithmetic device 7.

When measuring wind speed, the computing device 7 divides the seven corona discharge lines 1 into an ion collector group 3W located on the windward side and an ion collector group 3S located on the leeward side with respect to the wind direction W, as shown in FIG. , the current value ■ detected by the windward side ion collector group 3vI, and the current value IL detected by the ion collector group 3L located on the leeward side, into the current-voltage converter 14W14L''C'' voltage value V,, VL. After converting,
After subtracting and adding these voltage values V w and V L in the subtracter 15 and adder 16, respectively, the subtracted X value (
V-VL) and the added value (V!F +VL) are divided by the divider 17 K (Vw -Vt, , /Vll +VL)
L, outputs its output VO as a wind speed value. Also m1
The direction is determined by dividing each ion collector 31-N into the leeward side and the windward side, and calculating the output VO of the wind speed value as described above, and determining the output from the angle at which the output becomes the maximum value with respect to the mark 12. The maximum value is determined as the wind speed.

Next, the operation of the above embodiment will be explained.

First, place the ion anemometer of the present invention shown in FIG. 2 so that its mark 12 coincides with a predetermined direction such as north, or use a gyro or the like to automatically make the mark 2 point in a predetermined direction. After that, a high voltage is applied to the corona discharge wire 1,
When corona discharge starts, ions generated by ionization are
The electric field formed between the corona discharge wire 1 and each of the ion collectors 31 to 3N causes the ion to flow toward each of the ion collectors 31 to 3N, but is slightly blown to the leeward side by the wind. Therefore,
Ammeter 6 from each ion collector 31-N. Since the current value detected at ~ is affected by the wind direction and wind speed, the current value detected by the ammeter 6, -0 from each ion collector 31-9 is processed by the calculation device 7 to determine the wind direction with respect to the mark 12. and wind speed can be detected.

Next, the data actually obtained for wind speed and wind direction are shown in Figures 4 to 6.
This will be explained using figures.

In Figure 4, the number of ion collectors for the corona discharge wire is 4 to 8, and the voltage applied to the corona discharge wire 1 is 4 to 10.
When changing KV, what is the relationship between the applied voltage and the total current value Iw + It detected by the ion collector?
For comparison, Figure 9 also shows data when two ion collectors are installed. As can be seen from the figure, as the number of ion collectors increases, the corona discharge starting voltage decreases, and as the applied voltage increases, the total current value IW also increases, and the total current value changes by varying the wind speed and direction. I checked, but the total current value was 1. +I.

It was found that there was no change when the number of ion collectors was 4 to 8, but the total current value changed when there were 2 ion collectors.

Next, as shown in Figure 1, the number of ion collectors is set to eight, a wind whose speed is known in advance is flowed from the direction of the mark 12, and the voltage applied to the corona discharge wire 1 is varied from 5 to 10 KV. Figure 5 shows the data for determining the change in output ■○. As can be seen from Figure 5, as the wind speed increases, the output V
o also increases, and it is recognized that there is a certain proportional relationship, although there is a deviation near the wind speed of zero. Furthermore, as the applied voltage increases, the output VO decreases, but this is thought to be because the electric field strength increases and the Coulomb force increases.

FIG. 5 shows the relationship between wind speed and output VO when the wind direction is known in advance, and the actual wind direction varies.

FIG. 6 shows that the ion anemometer of the present invention is rotated with respect to the wind direction by changing the applied voltage from 5 to 10 KV, and the ion anemometer of the present invention is rotated with respect to the wind direction.
3 shows the change in output Vo when the angle θ of all marks 12 is changed. In the figure, when θ=π/2, the mark 12 is in a state facing upwind as shown in FIG. As can be seen from FIG. 6, the polarity of the output VO with respect to the rotation angle is different, but θ-π7/2. The sine change reaches its maximum value at θ=−π/2. Therefore, to find the wind direction, divide the current value in the ion collector into windward and leeward groups, find each output Vo, find the maximum value, and find the grouped angle at the maximum value. The wind direction can be determined and the maximum output value can be determined as the wind speed.

[Effects of the Invention] As is clear from the above explanation, the present invention provides the following excellent effects.

(1) Since a plurality of ion collectors are provided on the circumference around the corona discharge line, the wind speed and direction can be measured with high accuracy.

(2) There are no moving parts and a layer 1 telemeter with good responsiveness to the wind can be obtained9

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
FIG. 3 is a block diagram showing details of the arithmetic unit in FIG. 1, FIG. 4 is a diagram showing the relationship between applied voltage and collected ion current in the present invention, and FIG. FIG. 6 is a diagram showing the relationship between the wind direction and the output of the calculation device. In the figure, 1 is a corona discharge wire, 3 is an ion collector, 6 is an ammeter, and 7 is a calculation device. Apply voltage to Fig. 4 (kvl Fig. 5 Fig. 2)

Claims (1)

[Claims] 1. It has a corona discharge wire, a plurality of ion collectors provided on the circumference around the corona discharge wire, and a current detection section that detects the value of the current flowing through each of the ion collectors, and the current detection section An ion anemometer characterized by comprising a calculation device for measuring wind speed and wind direction from a detected current value.