JPH0943178A - Mist sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mist sensor for automating a mist water sampler by detecting the presence or absence of mist. SOLUTION: A mist sensor consists of a first rod electrode 1 where an edge part 1a is installed upward, a second rod electrode 2 which is separated while drooping over it, adheres mist F, and where an edge part 2a is formed conically, and a detection part 3 for detecting the conduction between both electrodes 1 and 2 due to mist dripping from the conical edge part 2 by applying a voltage between both electrodes l and 2, an upward edge part 1a is practically flat, and a gap W between both electrodes 1 and 2 ranges from 0.8mm to 1.2mm. Therefore, when mist water dropping from the conical edge part 2a reaches the upward edge part 1a, a circuit consisting of both electrodes 1 and 2 and a power supply 4 closes and the detection part 3 detect electrical ON/OFF signals. By connecting the detection part 3 to the control system of a mist water sampler, the mist water sampler can be automated to obtain accurate mist water data. Further, the move of an equipment can be limited to the minimum time, life can be extended, and energy is saved and maintenance control can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fog sensor, and more particularly to a fog sensor that detects the presence or absence of fog, converts it into an electric signal, and activates a fog water sampler.

[0002]

2. Description of the Related Art As a part of atmospheric environment measurement, in addition to measurement of acid rain, etc., in areas where fog is likely to occur, radiant fog and gliding fog that occur in nature are collected by a fog water sampler. Analytical studies of the components are being carried out. A necessary condition for forming fog particles is that air has a large amount of condensation nuclei and water vapor, and the air is cooled. Typical fog generated in this way is radiative mist generated by cooling the air in contact with the ground surface by radiative cooling that occurs on the ground surface, and gliding generated by cooling by adiabatic expansion of air blowing up the hillside. There is fog.

These fog particles are almost spherical and have a diameter of 2-10.
0 μm, the number concentration greatly varies within the range of 20 to 500 pieces / ml. The amount of fog is 1 g / m ^{3 for} a fog with a high water content and 0.02 g / m ³ for a light fog with a low water content. Conventionally,
A fog water sampler that collects fog naturally collides the fog that has flowed naturally with a water collection screen consisting of many fine lines and meshes and collects it in a water collection container through a fog particle filter ( (Not shown), as shown in FIG. 5, a water-collecting fan 12 is attached to the rear of the water-collecting screen 13 to forcibly suck in air containing mist to collect mist particles in the air.
Water collection container 15 through the fog particle filter 14
Had been collected in.

[0004]

However, since the fog generation time cannot be accurately predicted and it is difficult to notice from the generation to the fog disappearance, the accuracy of quantitative measurement of the fog collected by the fog water sampler is low. However, sometimes there was a problem that I missed the opportunity of collection. In addition, there are optical sensors that use a light-receiving element and a light-emitting element to detect fog, and a sensor that measures fog to determine fog. However, as described above, the optical sensor has a low fog detection accuracy because it is difficult to determine the fog occurrence because the transmissivity of fog having a large difference in diameter and density is not constant.

Further, in the sensor for judging the fog by measuring the electric transmittance, the substrate used is corroded by the moisture of the fog, and there is a problem that it is not practically used especially near the coast. It was difficult to automate the fog water sampler whether an optical sensor or an electric sensor using a substrate was adopted.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a fog sensor which detects the presence or absence of fog and takes it out as an electric signal so that the fog water sampler can be automated. It is a thing.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is a first rod electrode having an end portion facing upward, and a first rod electrode. Applying an AC voltage between the second rod electrode and the second rod electrode, which has a conical end with mist attached to the upward end of the electrode in a suspended state. And a detection unit that detects electrical continuity between the conical end portion and the upward end portion due to mist dripping from the conical end portion.

The invention according to claim 2 of the present invention is characterized in that the upper end of the first rod electrode is substantially flat. Furthermore, the invention according to claim 3 of the present invention is characterized in that the distance between the conical end portion and the upward end portion that are spaced apart in the hanging state is 0.8 mm to 1.2 mm. is there.

When the fog water adhering to and dropping on the second rod electrode reaches from the conical end to the flat upward end of the first rod electrode, the first and second rod electrodes and the AC power supply. The circuit consisting of is closed. At this time, the detection unit detects the generation of fog as an on / off electric signal. If this detector is connected to the control system of the fog water sampler, the fog water sampler can be automated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred fog sensor according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, a fog sensor 10 according to the present invention includes a first rod electrode 1 having an end 1a installed upward and an upward end 1 of the first rod electrode 1.
An alternating current power supply 4 is provided between the second rod electrode 2 and the second rod electrode 2 in which the end portion 2a is formed in a conical shape with the fog F attached thereto in a hanging state. The detection unit 3 includes a detection unit 3 for detecting conduction between the conical end 2a and the upward end 1a by the fog F dripping from the conical end 2a by applying a low voltage AC voltage. Coil 31
The electrical signal detected by the detection unit 3 is sent to the control unit 11 (FIG. 2).

Round rod electrodes made of stainless steel are preferably used for both the first rod electrode 1 and the second rod electrode 2, and it is preferable to provide a plurality of these rod electrodes in order to improve detection accuracy. , The upper end 1a of the first round bar electrode 1 is
Substantially flat is preferred, but a dish is also suitable. Further, considering that the fog particles gradually increase while gathering while descending due to their own weight, the second round bar electrodes 2 that are spaced apart in the hanging state are provided.
Cone-shaped end portion 2a of the first round rod electrode 1 and the upward end portion 1
The distance from a is preferably 0.8 mm to 1.2 mm, and it is desirable that the distance be narrow in order to quickly detect the occurrence of fog, but it is desirable that it be wide in order to quickly detect the end of fog generation. The optimum function is about 1 mm, which can accurately detect both the generation and the end of fog.

As shown in FIG. 3, a plurality of second round bar electrodes 2 each having a conical end 2a are attached (by soldering or screwing) to an upper metal conductive fitting 6. The mounting bracket 6 is fixed to the insulative mounting frame 5 with a fixing bolt 7b, and is also mounted so that power can be supplied from a power connection bolt 7a penetrating the insulative mounting frame 5. Stainless steel is suitable as the metal conductive mounting member 6 because it is highly resistant to corrosion by fog water.

Similarly, the same number of the first round bar electrodes 1 having the substantially flat end portions 1a as the second round bar electrodes 2 are attached to the lower metal conductive fittings 6 (soldering). , Or by screwing), the mounting bracket 6 is fixed to the insulating mounting frame 5 with fixing bolts 7b, and the power source connecting bolt 7a penetrating the insulating mounting frame 5 is connected.
It can be installed to supply power from.

Next, between the lower insulating mounting frame 5 to which the first round bar electrode 1 is fixed and the upper insulating mounting frame 5 to which the second round bar electrode 2 is fixed, an insulating The adjustment frames 8 and 8 are put in and fixed by frame fixing bolts 9 so that the two electrodes 1 and 2 which are spaced apart from each other have an appropriate distance W. This interval W
The setting of controls the sensitivity of the fog sensor of the present invention.
It is set to 0.8 mm to 1.2 mm, preferably about 1 mm.

As shown in FIG. 4, when the suction fan 16 is installed behind the fog sensor 10 and is constantly operated, the flow A of the atmosphere is improved, the effect of the fog sensor 10 is enhanced, and fog particles are generated. It is also useful for preventing corrosion of the fog sensor itself by drying it appropriately. Next, the operation of the fog sensor 10 according to the present invention will be described. As shown in FIG. 1, a low-voltage AC power supply 4 is connected to the second round bar electrode 2 via a relay coil 31. A low voltage AC power source 4 is connected to the first round bar electrode 1 to form a circuit.

The fog F adhering to the second round bar electrode 2 gradually collects along the round bar electrode 2 while descending by its own weight, forming a single drop at the conical end 2a, which is spaced directly below. However, the upper end 1a of the first round bar electrode 1 is reached. When the round electrodes 1 and 2 are electrically connected in this way, the relay coil 31 is excited, the relay contact 32 is operated, and an electric ON / OFF signal is sent from the detection unit 3.

As shown in FIG. 2, the fog sensor 10 of the present invention.
Is adopted in the fog water sampler, the fog in the atmosphere is sucked by the suction fan 16 which is constantly operated, taken out as an electric signal by the fog sensor 10 and transmitted to the control unit 11. The control unit 11 is connected to a commercial power source, and the control unit 11 drives the water sampling fan 12 for collecting the fog based on the fog detection signal of the fog sensor 10, and forces the water sampling fan 12 to operate. The fog particles in the air that have been sucked into the water collide with the water sampling screen 13 and are collected in the water sampling container 15 through the fog particle filter 14 for use in various data analyses.

It is desirable that the suction fan 16 that is constantly operated is also connected to the control unit 11, and that the fog sensor 10 and the suction fan 16 of the present invention are provided with a protective cover 17 for avoiding rain. The electrical conduction signal is used as a start signal for the fountain sampler's water sampling fan 12 and the like, and the fog can be sucked from the water sampling screen 13 only while the fog is occurring. The water sampler can be automated. For this reason, the movable time of the fog water sampler is kept to a minimum, the life of the equipment is extended, energy is saved, and maintenance of the equipment is reduced.

Furthermore, since the printed circuit board which is easily corroded is not used and the round rod electrodes 1 and 2 made of stainless steel are adopted, the life of the sensor itself is extended.

[0020]

As is apparent from the above description, the fog sensor of the present invention has a first rod electrode whose end portion is installed upward and a downwardly suspended state at the upper end portion of the first rod electrode. An AC voltage is applied between the second rod electrode, which is separated and has fog attached to form a conical end, and the first rod electrode and the second rod electrode, and drops from the conical end. It consists of a detection unit that detects the conduction between the conical end and the upward end due to fog,
The upward end of the first rod electrode is substantially flat, and the distance between the conical end and the upward end that are spaced apart in a depending state is 0.8 mm to 1.2 mm, preferably about 1 mm. Therefore, when the fog water attached to the second rod electrode and falling falls from the conical end to the flat upward end of the first rod electrode, the first and second rod electrodes and the AC power supply The circuit consisting of is closed, and the detection unit detects an electric ON / OFF signal. If this detector is connected to the control system of the fog water sampler, the fog water sampler can be automated and accurate fog water data can be obtained. Furthermore, the movable time of the fog water sampler is kept to a minimum, the life of the device is extended, energy saving is achieved, and maintenance of the device is reduced.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a fog sensor according to the present invention.

FIG. 2 is a system block diagram of a fog water sampler using a fog sensor according to the present invention.

FIG. 3 is a front view and a side view of a fog sensor according to the present invention.

FIG. 4 is a view in which an atmospheric suction fan is attached to the fog sensor according to the present invention.

FIG. 5 is an explanatory diagram of a conventional fog water sampler.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st rod electrode 1a ... Upward end part 2 ... 2nd rod electrode 2a ... (Cone shape) end part 3 ... Detection part 4 ... AC power supply 5 ... Mounting frame 6 ... Mounting metal fitting 7a ... Power supply connection bolt 7b ... Fixing bolt 8 ... Adjusting frame 9 ... Frame fixing bolt 10 ... Fog sensor 11 ... Control unit 12 ... Water sampling fan 13 ... Water sampling screen 14 ... Fog particle filter 15 ... Water sampling container 16 ... Suction fan 17 ... Protective cover 31 ... Relay coil 32 ... Relay contact 17 ... Protective cover A ... Atmosphere flow F ... Fog W ... Interval

Claims (3)

[Claims] 1. A first rod electrode (1) having an end portion (1a) installed upward, and a mist (F) attached in a hanging state to the upward end portion of the first rod electrode. The conical end portion is formed by applying an AC voltage between the second rod electrode (2) having the conical end portion (2a) and the first rod electrode and the second rod electrode. A fog sensor comprising: a detection unit (3) for detecting conduction between the conical end portion and the upward end portion due to the fog that is further dropped. 2. The fog sensor according to claim 1, wherein the upward end portion of the first rod electrode is substantially flat. 3. The distance between the conical end portion and the upward end portion that are spaced apart in a hanging state is 0.8 mm to 1.2 mm.
The fog sensor according to claim 1 or 2, wherein