JP2012008046A - Water temperature measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water temperature measurement device capable of measuring only water temperature by adjusting a timing of temperature measurement to reliably eliminate air temperature measurement.SOLUTION: A water temperature measurement device 110 of the present invention includes a buoy 210; a temperature sensor 214 that is provided on the outer surface of the buoy 210 and measures temperature; at least one detection means (a first water sensor 216) that determines whether the temperature sensor is in contact with the water surface in a state that the buoy is floated on the water; a measurement control circuit 218 that allows the temperature sensor to perform temperature measurement when the temperature sensor is determined to be in contact with the water surface by the detection means; and an information transmission part 222 that transmits water temperature information that indicates the measured temperature.

Description

  The present invention relates to a water temperature measuring device capable of measuring the temperature of water.

  Measurement of sea surface temperature (Sea Surface Temperature) in order to discover global meteorological events such as meteorology and oceanography, the occurrence of red tides, crude oil spills, and El Nino events at an early stage There is a desire to do it.

  Therefore, a technique is disclosed in which the sea surface is imaged using an infrared camera, image data captured before and after time are compared, and a change in sea surface temperature is captured based on a density difference between pixels (for example, Patent Document 1). This technology is intended to detect oil leaks from the submarine pipeline. Based on the temperature difference between the hot oil and the cold seawater, the temperature change in the imaging range of the infrared camera (whether there is an oil leak). Or not). Therefore, the sea surface temperature is separately measured, and the sea surface temperature is calculated by associating the measured water temperature with the density of the image data in advance.

JP 2003-28745 A

  However, in the technique described in Patent Document 1 described above, in order to measure the sea surface temperature, the image data has to be analyzed one by one, and the processing load is large. Moreover, since the sea surface temperature was indirectly measured through image data that fluctuated in time, the real-time property was lacking.

  Therefore, it is possible to install a thermometer on the buoy (buoy) and measure the temperature of the water surface directly with such a thermometer. However, if a thermometer is installed near the buoy water surface, the buoy tilts due to waves, etc. The gauge was exposed to the atmosphere, and the air temperature was measured in parallel with the water temperature, and the water temperature and the air temperature could not be distinguished afterwards. For example, if a thermometer is installed in the sea about 20 cm from the surface of the water that is not exposed to the atmosphere even under the influence of waves, the water temperature can be measured directly, but the water temperature in the water instead of the water surface will be measured. .

  Therefore, in view of such a problem, the present invention provides a water temperature measuring device capable of reliably measuring only the water temperature by devising the temperature measurement timing and reliably eliminating the temperature measurement. It is an object.

  In order to solve the above problems, a water temperature measuring device of the present invention is provided on a buoy, an outer surface of the buoy, a temperature sensor for measuring temperature, and the buoy floating on the water, and the temperature sensor is placed on the water surface. At least one detection means for determining whether the temperature sensor is in contact, a measurement control circuit that enables temperature measurement of the temperature sensor when the detection means determines that the temperature sensor is in contact with the water surface, and the measured temperature The information transmission part which transmits the water temperature information which shows is characterized by the above-mentioned.

  The detection means is a first water sensor provided on the outer surface of the buoy to determine that both of a pair of spaced apart parts are in contact with water, and the temperature sensor is a pair of When the part is viewed from the direction orthogonal to the outer surface of the buoy, it may be arranged on the connection of a pair of parts.

  The water temperature measuring device includes a ballast formed so as to protrude from the buoy in the outer circumferential direction and substantially above the water line, and the temperature sensor is vertically below the ballast with the water temperature measuring device floating on the water. And may be located near the ballast.

  The measurement control circuit makes the temperature sensor measure the temperature while determining that the first water sensor is in contact with water by being part of the closed circuit of the first water sensor and the temperature sensor. May be.

  Whether or not the outer surface of the buoy and the horizontal position of the buoy in the state where the water temperature measuring device is floated on water are provided vertically above the horizontal position of the first water sensor and the horizontal position of the temperature sensor and are in contact with water A second water sensor for determining whether or not the measurement control circuit determines that the first water sensor is in contact with water, and determines that the second water sensor is not in contact with water. During this time, the temperature sensor may measure the temperature.

  The buoy may be composed of two members, and the ballast may be a flange for connecting the two members.

  As described above, the present invention can devise the temperature measurement timing to reliably eliminate the temperature measurement and reliably measure only the water temperature.

It is explanatory drawing for demonstrating the schematic positional relationship of the water temperature measuring system concerning 1st Embodiment. It is explanatory drawing for demonstrating the external appearance of the water temperature measuring apparatus concerning 1st Embodiment. It is explanatory drawing for demonstrating the external appearance of the water temperature measuring apparatus concerning 1st Embodiment. It is the functional block diagram which showed the schematic function of the water temperature measuring apparatus concerning 1st Embodiment. It is a horizontal sectional view of a temperature sensor and a 1st water sensor for explaining relative positional relation of a temperature sensor and a 1st water sensor, and a flange. It is explanatory drawing for demonstrating a measurement control circuit. It is explanatory drawing for demonstrating the external appearance of the water temperature measuring apparatus concerning 2nd Embodiment. It is explanatory drawing for demonstrating the external appearance of the water temperature measuring apparatus concerning 2nd Embodiment. It is the functional block diagram which showed the schematic function of the water temperature measuring apparatus concerning 2nd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(First embodiment: water temperature measurement system 100)
FIG. 1 is an explanatory diagram for explaining a schematic positional relationship of the water temperature measurement system 100 according to the first embodiment. As shown in FIG. 1, the water temperature measurement system 100 includes a water temperature measurement device 110, a satellite 120, and an information aggregation device 130.

  For example, the water temperature measuring apparatus 110 of the present embodiment floats on the sea 102 and measures the water temperature of the sea 102. The water temperature measurement device 110 transmits water temperature information indicating the measured water temperature to the satellite 120 via an information transmission unit described later provided in itself. Then, the satellite 120 transmits the received water temperature information to the remote information aggregating apparatus 130. The information aggregating apparatus 130 aggregates the water temperature information and performs statistical processing on the water temperature information of the plurality of water temperature measuring apparatuses 110.

  The water temperature measuring device 110 aims to eliminate only the temperature measurement by devising the temperature measurement timing and measure only the water temperature. Hereinafter, a specific configuration of the water temperature measuring device 110 according to the present embodiment will be described in detail.

(Water temperature measuring device 110)
2 and 3 are explanatory diagrams for explaining the appearance of the water temperature measuring device 110 according to the first embodiment, and FIG. 4 is a schematic function of the water temperature measuring device 110 according to the first embodiment. It is the functional block diagram which showed. In particular, FIG. 3 (a) is a view seen from the horizontal direction when the water temperature measuring device 110 is floated on water, and FIG. 3 (b) is a view seen from the vertically lower side when the water temperature measuring device 110 is floated on water. FIGS. 3C and 3D are cross-sectional views for explaining the flange, respectively.

  As shown in FIGS. 2 to 4, the water temperature measurement device 110 includes a buoy 210, a ballast 212, a temperature sensor 214, a first water sensor (detection means) 216, and a measurement control circuit 218. The air pressure sensor 220 and the information transmitter 222 are configured.

  The buoy 210 is, for example, formed in a spherical shape having a diameter of 600 mm, and plays a role of floating the water temperature measuring device 110 itself on the water surface using buoyancy.

  In this embodiment, the ballast 212 protrudes from the buoy 210 in the outer circumferential direction and is formed in a disk shape. The ballast 212 has a structure in which the center of gravity of the water temperature measuring device 110 is vertically lower. By setting the center of gravity vertically downward and setting the weight appropriately with respect to the buoyancy of the buoy 210, the bottom surface of the ballast 212 is configured to be positioned substantially on the waterline when the water temperature measuring device 110 is floated on water. The

  Here, the ballast 212 plays a role of suppressing the water temperature measuring device 110 from being inclined with respect to the substantially draft line, and the structure in which the center of gravity is set to be vertically lower has the role of the water temperature measuring device 110 restoring the inclination with respect to the substantially water line. Bear.

  2 and 3, the ballast 212 is, for example, a flange 232 for connecting the upper hemisphere portion 210a and the lower hemisphere portion 210b of the buoy 210, from the upper hemisphere portion 210a and the lower hemisphere portion 210b. Each of the flange members 234 (indicated by 234a and 234b in FIGS. 2 and 3), each extending in the horizontal direction and having a width of 100 mm, is composed of two pieces, and the two flange members 234a and 234b are overlapped in the vertical direction.

  As shown in FIG. 3C, the flange member 234 is formed with a hole portion 236 penetrating in the vertical direction. By forming the hole 236 in the flange member 234, the water temperature measuring device 110 as a whole can be reduced in weight. Further, the hole 236 functions as a damper by letting a part of the pressure due to the water received by the flange member 234 from the wave through the hole 236, absorbs vibration, and stabilizes the posture of the buoy 210.

  3D, the flange member 234 is formed with a hole 240 through which the bolt 238a is inserted in the vertical direction at a position different from the hole 236. Grooves 234c are formed on the opposing surfaces of the flange members 234a and 234b in the direction of the buoy 210 in the hole 240, and an O-ring 242 is installed in the groove 234c.

  Then, by inserting the bolt 238a into the hole 240 and screwing the nut 238b into the bolt 238a, the O-ring 242 is crushed as shown by the white arrow in FIG. The member 234b comes into close contact. With such a configuration, it is possible to avoid water intrusion into the water temperature measuring device 110. Here, since the groove 234c for installing the O-ring 242 is formed in the flange member 234b, the flange member 234b is formed thicker than the flange member 234a by the depth of the groove.

  By providing the stabilizer 212 that stabilizes the posture of the buoy 210 as described above, the buoy 210 is prevented from being tilted by waves or the like, and the stabilizer 212 has the lower hemisphere portion 210b of the buoy 210 always immersed in water. Acts like

  The temperature sensor 214 is composed of, for example, a thermistor whose electric resistance changes with temperature, a thermocouple, or the like, and measures the temperature around the temperature sensor 214. Here, a thermistor will be described as an example of the temperature sensor 214.

  In the present embodiment, the temperature sensor 214 is vertically downward relative to the flange 232 (stabilizer 212) in a state where the water temperature measuring device 110 is floated on water, and is located on the inner side of the outer periphery of the flange 232 and on the flange. 232 is located in the vicinity. Therefore, the temperature sensor 214 is provided in the lower hemisphere portion 210b and is positioned in the immediate vicinity of the flange member 234b.

  Thus, by providing the temperature sensor 214 vertically downward relative to the flange 232, the temperature sensor 214 can be brought into contact with water while the water temperature measuring device 110 is floated on the water. In addition, when the water temperature measuring device 110 is floated on water, the lower surface side of the flange 232 is positioned on the water line, so that the temperature sensor 214 is provided vertically below the flange 232, so that the temperature sensor 214 can measure the temperature of the water surface (water surface, water surface) instead of underwater.

  Further, for example, when attempting to measure the sea surface temperature, since there are floating substances in the sea, there is a possibility that the temperature sensor 214 may be damaged by the collision of the floating substances. However, since the temperature sensor 214 is provided on the inner side of the outer periphery of the flange 232 and in the vicinity of the flange 232, the floating object collides with the flange 232 before the temperature sensor 214. Thus, it is possible to avoid a situation where the temperature sensor 214 is broken and the water temperature measurement becomes impossible.

  Furthermore, when measuring the water temperature of the water surface, heat from direct sunlight may affect the measurement of the water temperature. The water temperature measuring device 110 according to the present embodiment is vertically downward relative to the flange 232, and the configuration in which the temperature sensor 214 is provided on the inner side of the outer periphery of the flange 232 allows the flange 232 to block direct sunlight. The influence on the measurement of water temperature by sunlight can be avoided.

  Since the water temperature measuring device 110 is intended to measure the temperature of the water surface, a means for detecting (determining) whether the temperature sensor 214 is in contact with the water surface is required. In this embodiment, the means for electrically detecting water (seawater) is taken as an example. However, it is only necessary to detect whether the temperature sensor 214 is in contact with the surface of the water, and the water pressure may be detected. It may be detected.

  A first water sensor 216 serving as a detection unit is provided on the outer surface of the buoy 210 and determines whether or not it is in contact with water. In the present embodiment, the first water sensor 216 determines that it is in contact with water when both of the pair of spaced apart portions 216a and 216b are in contact with water. The first water sensor 216 uses, for example, a difference in resistance value (conduction coefficient) between the liquid (water) and gas (atmosphere) to flow a current from the part 216a to the part 216b of the first water sensor 216, for example. By measuring the current value at the time, it is possible to grasp whether or not it is in contact with the liquid. The first water sensor 216 is not limited to the configuration in which the pair of parts 216a and 216b are separated from each other, and for example, the pair of parts may have a coaxial structure. The first water sensor 216 is not limited to measuring the presence or absence of contact with water by measuring a current value, but may be a sensor using a wavelength absorbed by water molecules.

  FIG. 5 is a horizontal sectional view of the temperature sensor 214 and the first water sensor 216 for explaining the relative positional relationship between the temperature sensor 214 and the first water sensor 216 and the flange 232.

  As shown in FIG. 5, when the temperature sensor 214 is viewed from a direction orthogonal to the outer surface of the buoy 210, the pair of portions 216a and 216b of the first water sensor 216, on the connection of the pair of portions 216a and 216b, That is, it arrange | positions between a pair of site | parts 216a, 216b of the 1st water sensor 216. FIG. Thus, while it is determined that the first water sensor 216 is in contact with water, the temperature sensor 214 positioned between the pair of portions 216a and 216b of the first water sensor 216 inevitably has water. Will be in contact. Therefore, the measurement control circuit 218 described later can reliably determine whether or not the temperature sensor 214 is in contact with water through the first water sensor 216.

  Here, if the distance between the pair of portions 216a and 216b of the first water sensor 216 is excessively increased, the measurement control circuit 218 described later will be connected to the first sensor even though the temperature sensor 214 is in contact with water. It may be determined that the water sensor 216 is not in contact with water, and the temperature sensor 214 may stop measuring the water temperature. Here, in order to increase the opportunity for measuring the water temperature, the pair of portions 216a and 216b of the first water sensor 216 should be as short as possible across the temperature sensor 214.

  As shown in FIG. 5, the part 216a is sealed by the O-ring 250 and the O-ring 252a, and the part 216b is sealed by the O-ring 250 and the O-ring 252b. The temperature sensor 214 is sealed by an O-ring 250. With the configuration including such O-rings 250, 252 a, and 252 b, it is possible to install the temperature sensor 214 and the first water sensor 216 on the outer surface of the buoy 210 while preventing water from entering the buoy 210.

  The measurement control circuit 218 enables the temperature sensor 214 to measure the temperature when the detection unit determines that the temperature sensor 214 is in contact with the water surface. In the present embodiment, the measurement control circuit 218 causes the temperature sensor 214 to measure the temperature while determining that the first water sensor 216 is in contact with water.

  In the present embodiment, since the temperature sensor 214 is disposed on the connection of the pair of portions 216a and 216b of the first water sensor 216, when it is determined that the first water sensor 216 is in contact with water, It can be estimated that the temperature sensor 214 is also in contact with water. Accordingly, while the measurement control circuit 218 determines that the first water sensor 216 is in contact with water (while the first water sensor 216 is conducting), the temperature sensor 214 measures the temperature. The configuration allows the temperature sensor 214 to measure the temperature only while it is in contact with water. Therefore, the water temperature measuring device 110 can reliably exclude the air temperature and measure only the water temperature.

  In the present embodiment, the measurement control circuit 218 uses the water in the vicinity of the water temperature measurement device 110 through the first water sensor 216 as a part of the closed circuit of the temperature sensor 214 so that the first water sensor 216 While determining that it is in contact with water, the temperature sensor 214 is caused to measure the temperature.

  FIG. 6 is an explanatory diagram for explaining the measurement control circuit 218 according to the present embodiment. As shown in FIG. 6, the measurement control circuit 218 is connected in series with the temperature sensor 214 and the first water sensor 216, and includes a voltage power supply 260, a shunt resistor 262, an amplifier 264, an A / D converter 266, It is comprised including. For example, when the pair of portions 216 a and 216 b of the first water sensor 216 come into contact with water, the measurement control circuit 218 becomes a closed circuit, and a current corresponding to the resistance value (temperature) of the temperature sensor 214 flows in the closed circuit. The amplifier 264 amplifies the voltage applied to both ends of the shunt resistor 262, and the A / D converter 266 converts the amplified voltage into data as a temperature value. Thereby, the measurement control circuit 218 can acquire a temperature value.

  Since the measurement control circuit 218 controls the temperature sensor 214 based on the determination result of the first water sensor 216, the measurement control circuit 218 originally determines whether or not it is in contact with water through the first water sensor 216; A function unit that turns ON / OFF the measurement by the temperature sensor 214 in response to the determination result is required.

  Here, as shown in FIG. 6, when the first water sensor 216 itself is part of a closed circuit, the pair of parts 216 a and 216 b have a function of energizing when the first water sensor 216 comes into contact with water. The above-described ON / OFF function can be used, and it is possible to omit the circuit that determines whether or not it is in contact with water and the functional unit that turns ON / OFF the measurement by the temperature sensor 214. As described above, the temperature sensor 214 according to the present embodiment is composed of a thermistor, and thus acquires a voltage value or a current value that can uniquely specify the water temperature. Seawater is highly conductive, and the influence of including seawater in the closed circuit can be minimized by setting the resistance value range of the thermistor to be larger than the resistance value range of seawater.

  For example, when the first water sensor 216 is in contact with seawater, the resistance value of the first water sensor 216 is several ohms to several tens of ohms, and when it is in contact with the atmosphere, the resistance value is infinite. It becomes. In contrast, the temperature sensor 214 has a resistance change range in the temperature range to be used of several tens of k ohms to several hundreds of k ohms.

  When the first water sensor 216 is in contact with seawater, the combined resistance value of the first water sensor 216 and the temperature sensor 214 is almost determined by the resistance value of the temperature sensor 214, and the influence of the first water sensor 216. Is completely absent.

  When the first water sensor 216 is in contact with the atmosphere, the resistance value of the first water sensor 216 is infinite, and the temperature sensor 214 has a resistance value determined by the temperature of the atmosphere. In this case, the resistance value of the temperature sensor 214 is not affected and the combined resistance value of the first water sensor 216 and the temperature sensor 214 is infinite.

  Therefore, the current flowing in the closed circuit obtained by applying a predetermined voltage to the first water sensor 216 and the temperature sensor 214 is in contact with the atmosphere when the first water sensor 216 and the temperature sensor 214 are in contact with seawater. It differs greatly from the case where you are.

  When the first water sensor 216 is in contact with the atmosphere, no current flows, and when the first water sensor 216 is in contact with seawater, the current value is determined by the resistance value of the temperature sensor 214.

  Therefore, if the measurement control circuit 218 acquires the voltage value or current value only when the circuit is connected, the acquired voltage value or current value is a value corresponding to the water temperature.

  The measurement control circuit 218 determines that the voltage value or the current value is a value related to the water temperature based on a predetermined threshold value or more. For example, if the range of the current flowing through the shunt resistor during measurement of the water temperature is 10 μA to 150 μA, the current value is 0 μA when the first water sensor 216 is in contact with the atmosphere. What is necessary is just 5 microamperes.

  As described above, the configuration in which the measurement control circuit 218 uses the water in the vicinity of the water temperature measurement device 110 as a part of the closed circuit of the temperature sensor 214 through the first water sensor 216 can reduce the circuit and the load. Reliability can be improved. In particular, it is very effective in places where maintenance is difficult such as at sea.

  The atmospheric pressure sensor 220 is provided at the top in the vertically upward direction when the water temperature measuring device 110 is floated on water, and measures the atmospheric pressure on the water. Such an atmospheric pressure sensor 220 also has a greater opportunity to come into contact with the atmosphere due to the ballast 212, that is, can greatly increase the opportunity to measure atmospheric pressure instead of water pressure, and can continuously measure atmospheric pressure.

  The information transmission unit 222 transmits water temperature information indicating the measured temperature and measured atmospheric pressure information using wireless communication.

  Here, the information transmission unit 222 transmits the water temperature information and the atmospheric pressure information, but the present invention is not limited to this, and the voltage value and the current value calculated by the measurement control circuit 218 may be transmitted as they are. In this case, the information aggregating apparatus 130 calculates the water temperature by analyzing the voltage value and the current value.

  As described above, according to the water temperature measurement device 110 according to the present embodiment, it is possible to avoid measurement of an unnecessary temperature such as air temperature and reliably measure only the water temperature. In addition, by using a flange 232 as the ballast 212 and providing the temperature sensor 214 vertically below the flange 232, it becomes possible to measure the water temperature on the surface of the water, not in the water.

(Second Embodiment: Water Temperature Measuring Device 310)
In this embodiment, when the water temperature measuring device 310 is tilted and the temperature sensor 214 is submerged in water, the water temperature on the water surface is not measured. Therefore, the water temperature measuring device 310 that stops the water temperature measurement will be described.

  7 and 8 are explanatory diagrams for explaining the appearance of the water temperature measuring device 310 according to the second embodiment, and FIG. 9 is a schematic function of the water temperature measuring device 310 according to the second embodiment. It is the functional block diagram which showed.

  As shown in FIGS. 7 to 9, the water temperature measuring device 310 includes a buoy 210, a ballast 212 (flange 232), a temperature sensor 214, a first water sensor 216, and a second water sensor. 316, a measurement control circuit 318, an atmospheric pressure sensor 220, and an information transmission unit 222 are configured. The buoy (buoy) 210, the ballast 212 (flange 232), the temperature sensor 214, the first water sensor 216, the atmospheric pressure sensor 220, and the information transmission unit 222, which have already been described as the components in the first embodiment, Since the functions are the same, repeated description is omitted, and here, the second water sensor 316 and the measurement control circuit 318 having different configurations will be mainly described.

  As shown in FIGS. 8A and 8B, the second water sensor 316 has an outer surface of the buoy 210 and the horizontal position of the second water sensor 316 when the water temperature measuring device 310 is floated on water. It is provided vertically above the horizontal position of the water sensor 216 and the horizontal position of the temperature sensor 214, and it is determined whether or not it is in contact with water.

  While the measurement control circuit 318 determines that the first water sensor 216 is in contact with water and determines that the second water sensor 316 is not in contact with water, the temperature control circuit 318 controls the temperature sensor 214 to To measure.

  As shown in FIG. 8 (c), when the water temperature measuring device 310 is exposed to a large wave, and the flange 232 is temporarily not positioned on the waterline and tilted greatly, the temperature sensor 214 is It will be located underwater. In this case, since the first water sensor 216 determines that it is in contact with water, when only the first water sensor 216 is provided, the water temperature measured by the temperature sensor 214 is not in the water surface but in the water. It becomes temperature.

  Therefore, the water temperature measurement device 310 of this embodiment further includes a second water sensor 316 together with the first water sensor 216, and the measurement control circuit 318 determines that the first water sensor 216 is in contact with water. In addition, while it is determined that the second water sensor 316 is not in contact with water, the temperature sensor 214 is caused to measure the temperature.

  As shown in FIG. 8C, when the water temperature measuring device 310 is largely inclined and the temperature sensor 214 is located in the water instead of the water surface, the second water sensor 316 is the outer surface of the buoy 210 and the water temperature measurement. In the state where the device 310 is floated on water, it is determined to be in contact with water because it is provided vertically above the first water sensor 216 and the temperature sensor 214 relative to the flange 232. To do. Therefore, in the state shown in FIG. 8C, the measurement control circuit 318 performs processing such as not causing the temperature sensor 214 to measure the temperature or invalidating the measurement value. Thereby, the water temperature measuring device 310 can exclude the measurement of the water temperature in water.

  On the other hand, as shown in FIG. 8D, when the flange 232 of the water temperature measuring device 310 is located on the water line and the temperature sensor 214 and the first water sensor 216 are located on the water surface, the second water sensor 316 is Because it is located in the atmosphere, it is determined that it is not in contact with water. Therefore, when in the state shown in FIG. 8D, the measurement control circuit 318 causes the temperature sensor 214 to measure the temperature. Thereby, the water temperature measuring device 310 can only measure the water temperature of the water surface.

  As described above, according to the water temperature measuring device 310 according to the present embodiment, the temperature sensor 214 is provided vertically downward relative to the flange 232, and the first water sensor 216 and the temperature sensor 214 are vertically above. With the configuration in which the second water sensor 316 is provided at a position vertically above the flange 232, the measurement of the water temperature in water can be reliably eliminated, and only the water temperature on the water surface can be measured.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  The present invention can be used for a water temperature measuring device capable of measuring the temperature of water.

DESCRIPTION OF SYMBOLS 110 ... Water temperature measuring device 210 ... Buoy 212 ... Stabilizer 214 ... Temperature sensor 216 ... 1st water sensor 218, 318 ... Measurement control circuit 222 ... Information transmission part 232 ... Flange 316 ... 2nd water sensor

Claims (6)

A buoy,
A temperature sensor provided on the outer surface of the buoy, for measuring temperature;
At least one detection means for determining whether the temperature sensor is in contact with the water surface in a state where the buoy is floated on water;
A measurement control circuit that enables temperature measurement of the temperature sensor when the detection means determines that the temperature sensor is in contact with the water surface;
An information transmitter for transmitting water temperature information indicating the measured temperature;
A water temperature measuring device comprising: The detection means is a first water sensor provided on the outer surface of the buoy to determine that both of a pair of separated parts are in contact with water by contacting the water,
The said temperature sensor is arrange | positioned on the connection of a pair of said part when the said pair of site | part is seen from the direction orthogonal to the outer surface of the said buoy. The water temperature measuring apparatus of Claim 1 characterized by the above-mentioned. The water temperature measuring device includes a ballast formed to protrude from the buoy in the outer circumferential direction and substantially on the waterline.
3. The temperature sensor according to claim 1, wherein the temperature sensor is positioned vertically near the ballast and in the vicinity of the ballast in a state where the water temperature measuring device is floated on water. The water temperature measuring device described.   While the measurement control circuit is a part of a closed circuit of the first water sensor and the temperature sensor, the temperature sensor is determined while the first water sensor is in contact with water. The water temperature measuring device according to any one of claims 1 to 3, wherein the temperature is measured. The outer surface of the buoy and the horizontal position of the buoy in a state where the water temperature measuring device is floated on water are provided vertically above the horizontal position of the first water sensor and the horizontal position of the temperature sensor, and contact the water. A second water sensor for determining whether or not
While the measurement control circuit determines that the first water sensor is in contact with water and determines that the second water sensor is not in contact with water, the temperature sensor detects a temperature. The water temperature measuring device according to any one of claims 1 to 4, wherein the water temperature is measured. The buoy consists of two members,
The water temperature measuring device according to any one of claims 1 to 5, wherein the ballast is a flange for connecting the two members.

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