JPS60161554A - Salinometer - Google Patents

Abstract

PURPOSE:To measure the concentration of salt in the sea or the like an electric current value by a method wherein a coil wound in appropriate winding diameter and length is put in a non-magnetic and non-metallic watertight case, the case is set in the sea, and an AC voltage is impressed on the coil. CONSTITUTION:The coil 1 of the device which comprises a series circuit 3 composed of the coil 1 wound in appropriate winding diameter and length and an ammeter 2 measuring a current (i) flowing through the coil, and a power supply unit 4 impressing a prescribed AC voltage on the circuit 3, is put in a nonmagnetic and non-metallic watertight case 5 made of synthetic resin, for instance, and this case 5 is set in the seawater W. When the AC voltage is impressed on the opposite ends 1A and 1B of the coil 1, an induced current il corresponding to the concentration of salt in the seawater W flows in accordance with an alternating magnetic flux phi generated in the coil. Then the current (i) increase in the coil 1, since said current il cancels the alternating magnetic flux phi. The current (i) thus increasing is measured by the ammeter 2. In this way, salinometer having a simple structure which is hard to be affected by temperature and noise and free from electrolytic corrosion is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a salinity meter, and more particularly to a salinity meter that measures salinity using magnetically induced electromotive force in seawater.

Salinity is a representative characteristic of seawater, and organisms living in the ocean depend on it.

Fish ecosystems are also related to salinity, and therefore measurement of salinity is an important element in the exploration of fisheries resources.

By the way, conventional salinity measurement methods generally involve immersing an electrode in an aqueous solution, applying an alternating current voltage between the electrodes, measuring the electrical conductivity due to ions contained in seawater, and converting this into concentration and displaying it. Although these devices are well-known and widely used, they require a current to be passed through the electrodes, although there may be slight differences depending on the model. Therefore, the condition of the electrode surface has a large effect on measurement accuracy, and this Therefore, there is a problem that the electrode surface must be frequently cleaned, and since the material must not be subject to electrolytic corrosion, it is inevitably expensive.

However, in order to eliminate the above drawbacks, two waterproof coils are installed in seawater, one is used as an excitation transformer and the other is a detection transformer, and when an alternating current voltage is applied to the excitation transformer. It is also known to use a detection transformer to detect the induced electromotive force generated depending on the salinity of seawater, and thereby measure the salinity; however, with this method, the detection device is completely removed from the seawater. Although it has the advantage of being able to measure the salt concentration by shutting it off, it requires two coils, each with a voltage application device and a current detection device, making the device complex and making it difficult to suspend it deep into the sea. Therefore, when measuring the salt concentration in the sea, the structure of the watertight container becomes complicated, which has its drawbacks.

In view of the above-mentioned drawbacks, the present invention has been made with the purpose of providing a magnetic induction type salinity meter which is susceptible to electrolytic corrosion and has a significantly simpler structure. It consists of a series circuit consisting of a coil wound to the same diameter and length and an ammeter, and a power supply device that applies a constant alternating voltage to the circuit.9 The coil is a nonmagnetic and nonmetallic watertight case. It is characterized by being configured such that it can be housed inside the vessel and installed underwater.

Next, the present invention will be explained using examples.

FIG. 1 is a conceptual diagram of the structure of the present invention.

The salinity meter A of the present invention includes a series circuit 3 consisting of a coil l wound with an appropriate diameter and length, an ammeter 2 for measuring the current l flowing through the coil 1, and a series circuit 3 that The coil L is housed in a watertight case 5 made of non-magnetic and non-metallic material, such as a watertight case 5 made of synthetic resin, and can be installed underwater. has been configured.

Next, the operation of this invention will be explained.

FIG. 2 is an explanatory diagram of the operation of this invention.

In FIG. 2, when an alternating current voltage is applied to both ends IA and IB of the coil 1, an alternating magnetic flux y is generated.

At this time, the seawater W has an induced current i corresponding to the salinity concentration.
l flows.

This induced current ll cancels out the alternating magnetic flux X, and to supplement this, the current i in the coil 1 increases. This current 1
By measuring this with the ammeter 2, it is possible to know the salt concentration in seawater.

FIG. 3 is a conceptual diagram of the configuration of another embodiment of the present invention.
In FIG. 3, l is the coil l shown in FIG. 1, 2 is the ammeter shown in FIG.
is a coil made to have the same electrical characteristics as coil 1, and is placed near coil 1 but in the air.

Further, R□ and R2 are resistances where R1=R2, and are set to appropriate values for the coil 1 and the coil 10.

With such a circuit configuration, it is possible to detect only the increase in current due to the influence of salt content, regardless of the influence of temperature and noise.

Since this invention is constructed as described above, the element for detecting salt in seawater does not come into direct contact with seawater, and the salt concentration in seawater can be measured with only one coil. The structure of the detection part installed inside can be simplified, the structure of the watertight container can also be simplified accordingly, and the measurement of salt concentration in dust at a certain depth can be easily carried out, among other practical effects. We have it.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of the structure of the present invention, FIG. 2 is an explanatory diagram of the operation of an embodiment, and FIG. 3 is a conceptual diagram of the structure of another embodiment. A... Salinity meter, l... Coil, 2... Ammeter, 3... Series circuit, 4... Power supply, W... Seawater. 1g I 2m 73 bunches

Claims (1)

[Claims] (1) It consists of a series circuit consisting of a coil wound with an appropriate diameter and length and an ammeter, and a power supply device that applies a constant AC voltage to the circuit, and the coil is non-magnetic and non-magnetic. A salinity meter characterized by being configured such that it is housed in a watertight metal case and can be installed underwater.