Water content measurement device

Abstract

According to the present invention, a water content measurement device that measures the water content of food on a production line makes it possible to keep structural elements at or near the production line from being affected by steam and to position other structural elements away from the production line. A water content measurement device (100) comprises an antenna (13) that transmits electromagnetic waves toward food (SA) on a production line (7) and receives electromagnetic waves that have passed through the food (SA), an electromagnetic wave analysis device (15) that analyzes the electromagnetic waves that have passed through the food and been received by the antenna (13), and an information processing device (3) that calculates the water content of the food (SA) on the basis of analysis results for the electromagnetic waves from the electromagnetic wave analysis device (15). The antenna (13) and the electromagnetic wave analysis device (15) are housed in a single housing (11) and form an electromagnetic wave unit (1). The electromagnetic wave unit (1) is communicatively connected to the information processing device (3).

Description

Moisture measuring device

[0001] The present invention relates to a moisture measuring device that measures the moisture content of an object using electromagnetic waves.

[0002] A measuring device is known that uses electromagnetic waves to measure the moisture content of a given object. The measurement of moisture content using electromagnetic waves utilizes the property of electromagnetic waves being absorbed by water. This measuring device includes an antenna that transmits the electromagnetic waves to the object, an antenna that receives the electromagnetic waves that have passed through the object, an electromagnetic wave analyzer that controls and analyzes the electromagnetic waves, and an information processing device that calculates the moisture content based on the analysis results of the electromagnetic waves by the electromagnetic wave analyzer (e.g., based on changes in amplitude and phase of the electromagnetic waves) (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2021-012128

[0004] We are considering using the moisture content measuring device using electromagnetic waves to measure the moisture content of cooked foods while the foods are placed on a production line. For such applications, the measuring device must be installed on the production line where the foods are placed. However, water vapor from the foods is present around the production line where the cooked foods are placed. If the measuring device is placed in such an environment, there is a risk that condensation will occur on the device, causing water droplets to adhere to the device.

[0005] On the other hand, among the components constituting the measuring device, the antenna that transmits electromagnetic waves to food and receives the electromagnetic waves after they have passed through the food must be installed on the production line where the food is placed. Furthermore, it is preferable that the electromagnetic wave analysis device that outputs and analyzes the electromagnetic waves is not located far from the antenna. If the electromagnetic wave analysis device is located far from the antenna, a long cable must be used to connect the electromagnetic wave analysis device to the antenna. A long cable affects the signal between the antenna and the electromagnetic wave analysis device. Furthermore, long cables are often used while being bent, and the bending of this cable also affects the signal. In other words, using a long cable in a measuring device that uses electromagnetic waves makes it difficult to perform accurate measurements.

[0006] Furthermore, the information processing device that calculates the moisture content based on the analysis results of the electromagnetic waves by the electromagnetic wave analyzer is primarily used by users, and therefore it is desirable that this information processing device be clean and be able to be placed away from the production line, which is filled with water vapor and uncomfortable for people.

[0007] The object of the present invention is to provide a measuring device that uses electromagnetic waves to measure the moisture content of cooked food on a production line on which the food is placed, in such a way that components of the measuring device that are placed on or near the production line are not affected by water vapor, while other components can be placed at a location away from the production line.

[0008] A moisture measuring device according to one aspect of the present invention is a device that measures the moisture content of cooked food on a production line on which the food is placed. The moisture measuring device includes an antenna, an electromagnetic wave analysis device, and an information processing device. The antenna transmits electromagnetic waves toward the food placed on the production line and receives the electromagnetic waves that have passed through the food. The electromagnetic wave analysis device analyzes the received electromagnetic waves. The information processing device calculates the moisture content of the food based on the analysis results of the electromagnetic waves by the electromagnetic wave analysis device. In this moisture measuring device, the antenna and the electromagnetic wave analysis device are housed in a single housing to form an electromagnetic wave unit. Furthermore, the electromagnetic wave unit is connected to the information processing device so as to be able to communicate with the information processing device.

[0009] In the moisture measuring device described above, an antenna placed on the production line where cooked food is placed and an electromagnetic wave analysis device that analyzes the electromagnetic waves received by the antenna are housed in a single housing to form an electromagnetic wave unit. By housing the antenna and the electromagnetic wave analysis device in a single housing, exposure of the antenna and the electromagnetic wave analysis device to an atmosphere filled with water vapor can be prevented when the antenna and the electromagnetic wave analysis device are placed near the production line. Meanwhile, by communicatively connecting an information processing device to the electromagnetic wave unit that houses the antenna and the electromagnetic wave analysis device, the information processing device can be placed in a location away from the production line. As a result, exposure of the information processing device to water vapor can be prevented. Furthermore, users of the information processing device can work in a location away from the production line, which requires cleanliness and is filled with water vapor.

[0010] Furthermore, by housing the electromagnetic wave analysis device together with the antenna in a single housing, the electromagnetic wave analysis device can be located close to the antenna, eliminating the need to connect the electromagnetic wave analysis device to the antenna with a long cable. This allows the electromagnetic wave analysis device to receive the electromagnetic waves received by the antenna without being affected by a long cable. As a result, the information processing device can accurately calculate the moisture content of food based on the electromagnetic wave analysis results, minimizing the impact of cables, etc.

[0011] It is a diagram showing the overall configuration of the moisture measuring device. It is an external perspective view of the electromagnetic wave unit. It is a diagram showing the internal configuration of the electromagnetic wave unit. It is an enlarged view of the vicinity of the end portion on the side where the opening is formed on the bottom surface of the housing.

[0012] (1) Configuration of the Measuring Device A moisture measuring device 100 according to one embodiment will now be described with reference to the drawings. The moisture measuring device 100 is installed in a factory that produces food SA. Specifically, the moisture measuring device 100 is placed on the production line of the food factory and measures the moisture content of food SA that is placed and transported along the production line. The food SA to be measured is, for example, cooked food such as boiled rice, vegetables and / or meat that have been cooked by heating, such as "baking" or "steaming," or processed foods that are produced by subjecting raw materials (vegetables, meat, etc.) to a specific process. Because such food SA generates water vapor, the production line for food SA and its surroundings are filled with a steam-filled atmosphere.

[0013] 1, the moisture measuring device 100 includes an electromagnetic wave unit 1, an information processing device 3, and a gas flow generating section 5. FIG.

[0014] The electromagnetic wave unit 1 is placed above the production line 7 on which cooked food SA is placed. It transmits electromagnetic waves (called primary electromagnetic waves) to the food SA transported by the production line 7 to the location of the electromagnetic wave unit 1. The electromagnetic wave unit 1 also receives electromagnetic waves (called secondary electromagnetic waves) that pass through the food SA, are reflected by the production line 7, and return from the food SA. These primary and secondary electromagnetic waves have frequencies on the order of gigahertz, for example. The electromagnetic wave unit 1 analyzes the primary and secondary electromagnetic waves and transmits the analysis results to the information processing device 3.

[0015] The production line 7 is a device on which cooked food SA is placed and transported. The production line 7 is, for example, a transport device such as a belt conveyor. The production line 7 is preferably configured to reflect electromagnetic waves that pass through the food SA. For example, the portion of the production line 7 on which the food SA is placed may be made of a metal (e.g., stainless steel) that reflects electromagnetic waves, or a member that reflects electromagnetic waves (e.g., a metal plate such as a stainless steel plate) may be disposed below the portion on which the food SA is placed.

[0016] The information processing device 3 is a system configured with an arithmetic processing circuit such as a CPU, storage devices (RAM, ROM, SSD, hard disk, etc.), various interfaces, input devices such as a touch panel, a display device, etc. The information processing device 3 is, for example, an operation panel operated by a user, a personal computer, a tablet terminal, or a mobile terminal.

[0017] The information processing device 3 executes various information processes related to the moisture measuring device 100. Specifically, the information processing device 3 can control the transmission of electromagnetic waves from the electromagnetic wave unit 1. The information processing device 3 also receives the analysis results of the primary and secondary electromagnetic waves from the electromagnetic wave unit 1, and calculates the moisture content of the food SA based on the received analysis results of the primary and secondary electromagnetic waves.

[0018] The information processing device 3 is communicatively connected to the electromagnetic wave unit 1. Specifically, as described below, the information processing device 3 is communicatively connected to the electromagnetic wave unit 1 via a first signal input / output line CA1 such as a USB (Universal Serial Bus) cable. Signal transmission and reception between the information processing device 3 and the electromagnetic wave unit 1 is not significantly affected by the state of the first signal input / output line CA1. Therefore, a relatively long cable can be used as the first signal input / output line CA1. In other words, the first signal input / output line CA1 allows the information processing device 3 to be placed at a location away from the production line 7 on which the electromagnetic wave unit 1 is placed.

[0019] In this way, by being able to place the information processing device 3 at a location away from the production line 7, the user of the information processing device 3 can work at a location away from the production line 7, which requires cleanliness and is filled with water vapor.

[0020] The gas flow generating unit 5 generates a gas flow between the electromagnetic wave unit 1 and the food SA. This gas flow is also called an "air curtain." The gas flow generating unit 5 is, for example, a device that generates a gas flow of air, such as a fan or an air blower. If water vapor is present in the propagation path of the electromagnetic waves (primary electromagnetic waves, secondary electromagnetic waves) between the electromagnetic wave unit 1 and the food SA, there is a risk of condensation on the electromagnetic wave unit 1. Therefore, in this embodiment, the gas flow generating unit 5 generates a gas flow between the electromagnetic wave unit 1 and the food SA, thereby removing water vapor from the propagation path of the electromagnetic waves between the electromagnetic wave unit 1 and the food SA. By removing water vapor from the propagation path of the electromagnetic waves, condensation on the electromagnetic wave unit 1 can be prevented.

[0021] Additionally, the moisture measuring device 100 may be provided with, for example, a moving unit for adjusting the position of the electromagnetic wave unit 1 relative to the manufacturing line 7 .

[0022] (2) Configuration of the Electromagnetic Wave Unit The configuration of the electromagnetic wave unit 1 will be described below with reference to Figures 1 to 3. Figure 2 is an external perspective view of the electromagnetic wave unit 1. Figure 3 is a diagram showing the internal configuration of the electromagnetic wave unit 1. As shown in Figures 2 and 3, the electromagnetic wave unit 1 has a cubic or rectangular parallelepiped shape. In Figures 2 and 3, the extension direction of one side of the horizontal plane of the electromagnetic wave unit 1 is the X direction, the direction perpendicular to the X direction on the horizontal plane is the Y direction, and the height direction of the electromagnetic wave unit 1 is the Z direction.

[0023] The electromagnetic wave unit 1 has a housing 11, an antenna 13, an electromagnetic wave analysis device 15, and a temperature sensor 17. The housing 11 houses the antenna 13, the electromagnetic wave analysis device 15, and the temperature sensor 17.

[0024] Antenna 13 transmits primary electromagnetic waves to food SA transported by production line 7 to the location of electromagnetic wave unit 1. Antenna 13 also receives secondary electromagnetic waves that are generated when the primary electromagnetic waves pass through food SA, are reflected by production line 7, and return from food SA. Antenna 13 is, for example, a horn antenna. Antenna 13 is provided with a first terminal 13a for inputting a high-frequency signal for outputting electromagnetic waves (primary electromagnetic waves) from antenna 13, and for outputting a high-frequency signal corresponding to the electromagnetic waves (secondary electromagnetic waves) received by antenna 13.

[0025] The electromagnetic wave analysis device 15 sets the output power of the primary electromagnetic waves to be transmitted to the food SA, and outputs a high-frequency signal based on this output power setting to the antenna 13. The electromagnetic wave analysis device 15 also inputs a high-frequency signal corresponding to the secondary electromagnetic waves that have passed through the food SA and been received by the antenna 13. The electromagnetic wave analysis device 15 analyzes the primary electromagnetic waves output from the antenna 13 and the secondary electromagnetic waves received by the antenna 13, and outputs the analysis results to the information processing device 3. The electromagnetic wave analysis device 15 is, for example, a vector network analyzer (VNA).

[0026] The electromagnetic wave analysis device 15 has a power supply line CA2, a second signal input / output line CA3, and a second terminal 15a. The power supply line CA2 is connected to a power supply PS external to the housing 11 and supplies power from the power supply PS to the electromagnetic wave analysis device 15. The second signal input / output line CA3 is a wiring for outputting analysis results relating to the primary electromagnetic waves and secondary electromagnetic waves to the information processing device 3.

[0027] The second terminal 15a is a terminal for connecting the electromagnetic wave analysis device 15 to the antenna 13. By connecting the second terminal 15a of the electromagnetic wave analysis device 15 and the first terminal 13a of the antenna 13 via a third signal input / output line CA5, the electromagnetic wave analysis device 15 and the antenna 13 are connected so as to be able to transmit and receive signals.

[0028] The temperature sensor 17 is fixed to an electromagnetic wave window 11d (described later) at the bottom of the housing 11 and is a sensor that measures the temperature of the food SA on the production line 7. The temperature sensor 17 is, for example, an infrared sensor. In the moisture measuring device 100, the information processing device 3 receives a signal from the temperature sensor 17 and can determine the temperature of the food SA based on the signal.

[0029] The following describes details of the housing 11 and a method for storing the antenna 13 and the electromagnetic wave analysis device 15 in the internal space of the housing 11. First, details of the housing 11 will be described. The housing 11 is a hollow cubic or rectangular parallelepiped member having an internal space. The housing 11 has a top surface 11a, side surfaces 11b, and a bottom surface 11c. The top surface 11a, side surfaces 11b, and bottom surface 11c are integrally formed and separate the internal space of the housing 11 from the external space. The integrally formed top surface 11a, side surfaces 11b, and bottom surface 11c constitute the main body of the housing 11. The top surface 11a, side surfaces 11b, and bottom surface 11c may be integrated by, for example, forming them as separate members and fixing them together by welding or the like, or they may be integrated by hollowing out a single member to form the top surface 11a, side surfaces 11b, and bottom surface 11c.

[0030] The main body of the housing 11 (i.e., the top surface 11a, side surfaces 11b, and bottom surface 11c) is made of, for example, stainless steel. By making the main body of the housing 11 out of stainless steel, rusting of the main body of the housing 11 can be suppressed even when the electromagnetic wave unit 1 is installed on the production line 7. Furthermore, even if food comes into contact with the housing 11, this contact does not adversely affect the housing 11 and / or the food, making it superior to other materials in terms of hygiene. As a result, the housing 11 can be kept clean.

[0031] If another material such as iron were used for the housing 11, a coating or the like would be required to prevent rust, but there is a concern that the coating may deteriorate over time and fall off the housing 11. The stainless steel housing 11 is made of a pure material, which prevents foreign matter from falling into the food SA. As such, the main body of the stainless steel housing 11 is ideal for placement on the food production line 7.

[0032] A pair of mounting portions 111 are provided on the Y-direction end side of the upper surface 11a of the housing 11. The electromagnetic wave unit 1 is fixed on the production line 7 by fixing the mounting portions 111 to mounting members provided on the production line 7.

[0033] An opening is provided on the top surface 11a of the housing 11. During normal use, this opening is closed by a lid 112. By removing the lid 112, the internal space of the housing 11 can be accessed through the opening on the top surface 11a. For example, when fixing the antenna 13 to an antenna fixing portion 118 inside the housing, by removing the lid 112, the antenna fixing portion 118 can be accessed through the opening on the top surface 11a.

[0034] 2, a predetermined mark M (e.g., a graphic that calls attention, a trademark, a logo, etc.) is provided on the outer surface of the lid 112. This mark M is not provided by attaching an attachment (e.g., a sticker, etc.) on which the mark M is printed to the outer surface of the lid 112, but is provided directly on the outer surface of the lid 112 by performing a predetermined process (e.g., laser marking, etc.) on the outer surface of the lid 112. Such a mark M may also be provided on the outer surfaces of the top surface 11a, the side surfaces 11b, and the bottom surface 11c, but it can also be provided directly on the outer surfaces of the top surface 11a, the side surfaces 11b, and the bottom surface 11c.

[0035] If a sticker or other adhesive is attached to the outer surface of the housing 11, there is a possibility that the adhesive may peel off from the housing 11 and fall into the food SA due to deterioration of the adhesive itself or deterioration of the adhesive strength, etc. By performing a predetermined process on the housing 11 and providing a predetermined mark M directly on the housing 11, it is possible to eliminate the possibility of such an adhesive falling into the food SA.

[0036] Provided on the end side of the top surface 11a in the X direction are a first wiring outlet 113 for extracting the power supply line CA2 of the electromagnetic wave analysis device 15 to the outside of the housing 11 and connecting it to the power supply PS, a second wiring outlet 114 for extracting the second signal input / output line CA3 of the electromagnetic wave analysis device 15 to the outside, and a third wiring outlet 115 for extracting the wiring CA4 of the temperature sensor 17 to the outside and connecting it to the information processing device 3. The first wiring outlet 113, the second wiring outlet 114, and the third wiring outlet 115 are fixed to the top surface 11a to prevent water vapor from entering the inside of the housing 11 from the outside.

[0037] The first wiring outlet 113 and the third wiring outlet 115 are, for example, waterproof connectors.

[0038] The second wiring outlet 114 is a waterproof relay member having a predetermined port and a terminal for connecting the port to the second signal input / output line CA3. The second wiring outlet 114 is attached to the upper surface 11a in a waterproof structure. The predetermined port of the second wiring outlet 114 is, for example, a USB port. This allows the information processing device 3 and the second wiring outlet 114 to be connected using the first signal input / output line CA1, which is a USB cable.

[0039] With the above configuration, the information processing device 3 arranged outside the housing 11 and the electromagnetic wave analysis device 15 arranged in the internal space of the housing 11 can be connected so as to be able to send and receive signals via the first signal input / output line CA1, the second wiring outlet 114, and the second signal input / output line CA3.

[0040] A pressure adjustment plug 116 is provided on the top surface 11a of the housing 11. The pressure adjustment plug 116 makes the atmosphere in the internal space of the housing 11 the same as the atmosphere in the space outside the housing 11 while maintaining waterproof and dustproof properties of the internal space.

[0041] Since the top surface 11a, side surfaces 11b, and bottom surface 11c of the housing 11 are formed gastight, if the pressure adjustment plug 116 is not provided, the atmosphere when the antenna 13 and the electromagnetic wave analysis device 15 are housed in the internal space of the housing 11 will be maintained as is. In such a case, when the electromagnetic wave unit 1 is placed on the production line 7, a situation may arise in which the atmosphere in the internal space of the housing 11 differs significantly from the external atmosphere. If the atmosphere in the internal space of the housing 11 differs significantly from the external atmosphere, condensation may occur in the internal space of the housing 11.

[0042] The pressure adjustment plug 116 allows gas to pass between the internal space of the housing 11 and the outside while maintaining waterproof and dustproof properties, thereby preventing the atmosphere in the internal space of the housing 11 from being significantly different from the atmosphere outside, which would otherwise occur if external gas were to flow into the internal space of the housing 11 or if gas in the internal space of the housing 11 were to flow out to the outside. As a result, condensation can be prevented from occurring in the internal space of the housing 11, and damage to the antenna 13, electromagnetic wave analysis device 15, etc. stored in the internal space of the housing 11 due to condensation can be prevented.

[0043] A first protrusion 117a and a second protrusion 117b are formed on the inner space side of the upper surface 11a. An antenna fixing portion 118 is provided to bridge the first protrusion 117a and the second protrusion 117b.

[0044] An opening O1 is provided in the bottom surface 11c of the housing 11. The opening O1 is closed by an electromagnetic wave window 11d. Specifically, the electromagnetic wave window 11d closes the opening O1 by sandwiching a packing 11e between itself and the bottom surface 11c and fastening it to the bottom surface 11c with screws or the like. By providing the packing 11e between the bottom surface 11c and the electromagnetic wave window 11d, the electromagnetic wave window 11d can be fastened to the bottom surface 11c in a gas-tight manner.

[0045] The packing 11e can be made of, for example, a rubber material containing metal (e.g., metal particles). A metal detection device is generally installed on the food SA production line 7 to detect metal contamination in the food SA. Therefore, by making the packing 11e from a material containing metal, even if a part of the packing 11e (e.g., a small fragment) falls into the food SA, it can be quickly detected by the metal detection device installed on the production line 7. The packing 11e may also be a different color from the object being inspected (the food SA). This makes it easier to detect a fallen part of the packing 11e by color identification or visual inspection by a human.

[0046] The electromagnetic wave window 11d is made of a material that allows electromagnetic waves to pass through (for example, a resin such as polycarbonate). By making the electromagnetic wave window 11d of a material that allows electromagnetic waves to pass through, the primary electromagnetic waves transmitted from the antenna 13 can be transmitted from inside the housing 11 to the outside through the electromagnetic wave window 11d and the opening O1. Furthermore, the secondary electromagnetic waves that have passed through the food SA can be guided into the housing 11 through the electromagnetic wave window 11d and the opening O1.

[0047] As shown in Fig. 4, an inclined surface 119 inclined with respect to the Z direction is formed at the portion of the bottom surface 11c where the electromagnetic wave window 11d is arranged, specifically at the end of the bottom surface 11c on the side where the electromagnetic wave window 11d is arranged (i.e., the end of the bottom surface 11c on the side where the opening O1 is formed). Fig. 4 is an enlarged view of the vicinity of the end of the bottom surface 11c on the side where the opening O1 is formed.

[0048] By forming the inclined surface 119 on the bottom surface 11c, the gas flow from the gas flow generating unit 5 flows more easily with less stagnation, making it less likely for water vapor in the atmosphere of the production line 7 to remain on the electromagnetic wave window 11d. As a result, adhesion of water droplets to the electromagnetic wave window 11d can be suppressed. By suppressing adhesion of water droplets to the electromagnetic wave window 11d, it is possible to suppress interaction between the primary electromagnetic wave output from the antenna 13 and the secondary electromagnetic wave after passing through the food SA and water droplets attached to the electromagnetic wave window 11d. In other words, it is possible to prevent water droplets attached to the electromagnetic wave window 11d from interfering with the moisture percentage measurement.

[0049] Next, a method for storing the antenna 13 and the electromagnetic wave analysis device 15 in the internal space of the housing 11 will be described. As shown in Fig. 3, the antenna 13 is stored in the internal space of the housing 11 by being fixed to an antenna fixing portion 118 provided on the top surface 11a of the housing 11. The antenna 13 fixed to the antenna fixing portion 118 is disposed in the internal space of the housing 11 so as to face the electromagnetic wave window 11d. This allows the antenna 13 to transmit electromagnetic waves to the outside of the housing 11 through the electromagnetic wave window 11d and the opening O1, and to guide external electromagnetic waves through the electromagnetic wave window 11d and the opening O1.

[0050] The electromagnetic wave analysis device 15 is fixed to an upper portion of the side surface 11b of the housing 11 facing the internal space, and is housed in the internal space of the housing 11. By fixing the electromagnetic wave analysis device 15 to the side surface 11b of the housing 11 and housing it in the internal space of the housing 11, the electromagnetic wave analysis device 15 can be placed close to the antenna 13 housed in the internal space of the housing 11. As a result, the third signal input / output line CA5 connecting the electromagnetic wave analysis device 15 and the antenna 13 can be shortened.

[0051] The electromagnetic wave analysis device 15 is positioned in a direction that ensures a large space between the second terminal 15a of the electromagnetic wave analysis device 15 and the side surface 11b of the housing 11. This allows the third signal input / output line CA5 to be stored in the internal space of the housing 11 without being bent tightly. By positioning the electromagnetic wave analysis device 15 in this direction, the power supply line CA2 and the second signal input / output line CA3 can also be wired to a minimum length within the housing 11.

[0052] Furthermore, if the long side of the electromagnetic wave analysis device 15 is arranged parallel to the short side direction (Y direction) of the housing 11, the short side of the housing 11 will become longer, which may result in a larger housing 11. In other words, by arranging the long side of the electromagnetic wave analysis device 15 parallel to the long side of the housing 11, the housing 11 can be made compact.

[0053] The electromagnetic wave analysis device 15 is fixed to one of the two side surfaces 11b of the housing 11, the side surface 11b opposite to the protruding direction of the first terminal 13a of the antenna 13. This prevents the distance between the second terminal 15a of the electromagnetic wave analysis device 15 and the first terminal 13a of the antenna 13 from becoming too small, and allows the third signal input / output line CA5 to be housed in the internal space of the housing 11 without being bent too tightly.

[0054] In this way, by making the third signal input / output line CA5 short and not forming a tight bend, the electromagnetic wave analysis device 15 can transmit high-frequency signals for outputting primary electromagnetic waves to the antenna 13 with almost no influence from the third signal input / output line CA5, and can receive high-frequency signals corresponding to the secondary electromagnetic waves received by the antenna 13 with almost no influence from the third signal input / output line CA5.

[0055] Furthermore, it is preferable to maintain a constant bending state of the third signal input / output line CA5 through which the high-frequency signal propagates. If the bending state of the third signal input / output line CA5 changes with each moisture content measurement, the bending state fluctuations will affect the propagation state of the high-frequency signal in the third signal input / output line CA5, making it impossible to accurately measure the moisture content. For this reason, the third signal input / output line CA5 is fixed to a first wiring fixing member 120a provided on a first protrusion 117a protruding from the top surface 11a of the housing 11. The first wiring fixing member 120a is, for example, an insulation lock. By fixing the third signal input / output line CA5 to the first wiring fixing member 120a, the bending state of the third signal input / output line CA5 is less likely to change.

[0056] By making it difficult for the bending state of the third signal input / output line CA5 to change, the high-frequency signal for generating the primary electromagnetic wave to be transmitted to the food SA and the high-frequency signal corresponding to the secondary electromagnetic wave after passing through the food SA can be propagated between the antenna 13 and the electromagnetic wave analysis device 15 without being affected by the third signal input / output line CA5. In this way, by transmitting and receiving the high-frequency signal for generating the primary electromagnetic wave and the high-frequency signal corresponding to the secondary electromagnetic wave after passing through the food SA without being affected by changes in the bending of the third signal input / output line CA5, the moisture content of the food SA can be measured more accurately.

[0057] A second wiring fixing member 120b is provided on a second protruding portion 117b protruding from the upper surface 11a of the housing 11. The second wiring fixing member 120b fixes the wiring CA4 of the temperature sensor 17. The second wiring fixing member 120b is, for example, an insulation lock.

[0058] The first wiring fixing member 120a and / or the second wiring fixing member 120b may be, for example, a metal-containing insulation lock, so that even if the first wiring fixing member 120a and / or the second wiring fixing member 120b are closed, they can be detected by a metal detector or the like even if they fall onto the food SA production line 7.

[0059] (3) Moisture content measurement method The following describes a method for measuring the moisture content of food SA using the moisture measuring device 100. First, the gas flow generating unit 5 is operated to generate a gas flow between the electromagnetic wave unit 1 and the production line 7 (food SA).

[0060] Next, the electromagnetic wave analysis device 15 outputs a high-frequency signal to the antenna 13 so that the antenna 13 transmits a primary electromagnetic wave toward the food SA. The primary electromagnetic wave transmitted from the antenna 13 passes through the food SA placed on the production line 7 and is reflected by the production line 7. After passing through the food SA, the primary electromagnetic wave is reflected, generating a secondary electromagnetic wave. The secondary electromagnetic wave propagates toward the electromagnetic wave unit 1. The secondary electromagnetic wave propagating toward the electromagnetic wave unit 1 is received by the antenna 13. The antenna 13 outputs a high-frequency signal corresponding to the received secondary electromagnetic wave to the electromagnetic wave analysis device 15.

[0061] The electromagnetic wave analysis device (vector network analyzer) 15 analyzes the electromagnetic waves and outputs the analysis results to the information processing device 3. Specifically, the electromagnetic wave analysis device 15 analyzes the amplitude and / or phase of the electromagnetic waves when they pass through the food SA and outputs the analysis results to the information processing device 3.

[0062] The information processing device 3 calculates the moisture content of the food SA based on the analysis results received from the electromagnetic wave analysis device 15. Specifically, the electromagnetic wave analysis device 15 calculates the change in amplitude and / or phase of the electromagnetic waves when the food SA passes through, compared to the amplitude and / or phase (background data) of the electromagnetic waves when the food SA does not pass through, which has been analyzed and stored in advance. The information processing device 3 calculates the moisture content of the food SA by comparing the calculated change in amplitude and / or phase of the electromagnetic waves with a calibration curve stored in advance.

[0063] In the moisture measuring device 100 described above, an antenna 13, which is placed on the production line 7 on which cooked food SA is placed, and an electromagnetic wave analysis device 15, which analyzes the electromagnetic waves received by the antenna 13, are housed in a single housing 11 to form the electromagnetic wave unit 1. By housing the antenna 13 and the electromagnetic wave analysis device 15 in a single housing 11, it is possible to prevent the antenna 13 and the electromagnetic wave analysis device 15 from being exposed to an atmosphere filled with water vapor when they are placed near the production line 7.

[0064] On the other hand, by communicatively connecting the information processing device 3 to the electromagnetic wave unit 1 that houses the antenna 13 and the electromagnetic wave analysis device 15, the information processing device 3 can be placed at a location away from the production line 7. As a result, the information processing device 3 can be prevented from being exposed to water vapor. Also, the user of the information processing device 3 can work at a location away from the production line 7, which requires cleanliness and is filled with water vapor.

[0065] Depending on the food SA production line 7, periodic cleaning may be required for maintenance, but cleaning can be made easier by being able to insert, remove, and separate cables at 113, 114, and 115. Because there is no need to remove the housing 11 from the production line 7 during cleaning, the positional relationship between the antenna 13 and the electromagnetic wave analyzer 15 and the wiring state can be prevented from changing with each cleaning, and there is no need to worry about installation reproducibility.

[0066] The electromagnetic wave unit 1, which remains in place on the production line 7 during cleaning, can be cleaned by, for example, wiping the outer surface of the housing 11.

[0067] Furthermore, by storing the electromagnetic wave analysis device 15 together with the antenna 13 in a single housing 11, the electromagnetic wave analysis device 15 can be located close to the antenna 13, eliminating the need to connect the electromagnetic wave analysis device 15 to the antenna 13 with a long cable. This allows the electromagnetic wave analysis device 15 to output a high-frequency signal for outputting a primary electromagnetic wave from the antenna 13 to the antenna 13 without being affected by the cable, and to receive a high-frequency signal corresponding to the secondary electromagnetic wave received by the antenna 13 without being affected by the cable. As a result, the information processing device 3 can accurately calculate the moisture content of food based on the analysis results of the electromagnetic waves that are not affected by cables, etc.

[0068] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the gist of the invention. The information processing device 3 and the electromagnetic wave unit 1 are not limited to being able to communicate with each other via a wired connection using the first signal input / output line CA1, but may also be able to communicate with each other wirelessly using a wireless LAN or the like.

[0069] For example, by providing a wireless communication device (e.g., a wireless LAN router device) in the electromagnetic wave unit 1, connecting the second signal input / output line CA3 of the electromagnetic wave analysis device 15 to this wireless communication device, and if necessary, also providing a wireless communication device in the information processing device 3, the information processing device 3 and the electromagnetic wave analysis device 15 can communicate wirelessly via the wireless communication device and the second signal input / output line CA3.

[0070] If the information processing device 3 is located far away from the production line 7 (i.e., the electromagnetic wave unit 1), the facility where the production line 7 is located may be equipped with, for example, a wireless repeater and / or a device for network communication with the outside world, such as the Internet (e.g., a router device, a gateway device, etc.).

[0071] The antenna 13 and the electromagnetic wave analysis device 15 can also be connected in close proximity using a socket or the like.

[0072] When the electromagnetic wave analysis device 15 is fixed to the side surface 11b of the housing 11, a heat conductive material may be sandwiched between the electromagnetic wave analysis device 15 and the side surface 11b. This allows the heat generated from the electromagnetic wave analysis device 15 to be efficiently transferred to the housing 11, preventing the electromagnetic wave analysis device 15 from becoming too hot.

[0073] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0074] (First Aspect) A moisture measuring device (e.g., moisture measuring device 100) is a device that measures the moisture content of cooked food (e.g., food SA) on a production line (e.g., production line 7) on which the food is placed. The moisture measuring device includes an antenna (e.g., antenna 13), an electromagnetic wave analysis device (e.g., electromagnetic wave analysis device 15), and an information processing device (e.g., information processing device 3). The antenna outputs electromagnetic waves toward the food placed on the production line and receives the electromagnetic waves that have passed through the food. The electromagnetic wave analysis device analyzes the electromagnetic waves that have passed through the food and received by the antenna. The information processing device calculates the moisture content of the food based on the analysis results of the electromagnetic waves by the electromagnetic wave analysis device. In this moisture measuring device, the antenna and electromagnetic wave analysis device are housed in a single housing (e.g., housing 11) to form an electromagnetic wave unit (e.g., electromagnetic wave unit 1). The electromagnetic wave unit is also communicably connected to the information processing device.

[0075] In the moisture measuring device of the first aspect, an antenna placed on a production line where cooked food is placed and an electromagnetic wave analysis device that analyzes the electromagnetic waves received by the antenna are housed in a single housing to form an electromagnetic wave unit. By housing the antenna and the electromagnetic wave analysis device in a single housing, it is possible to prevent the antenna and the electromagnetic wave analysis device from being exposed to an atmosphere filled with water vapor when they are placed near the production line. Meanwhile, by communicatively connecting an information processing device to the electromagnetic wave unit that houses the antenna and the electromagnetic wave analysis device, the information processing device can be located away from the production line. As a result, the information processing device can be prevented from being exposed to water vapor. Furthermore, users of the information processing device can work in a location away from the production line, which requires cleanliness and is filled with water vapor.

[0076] Furthermore, by housing the electromagnetic wave analysis device together with the antenna in a single housing, the electromagnetic wave analysis device can be located close to the antenna, eliminating the need to connect the electromagnetic wave analysis device to the antenna with a long cable. This allows the electromagnetic wave analysis device to receive the electromagnetic waves received by the antenna without being affected by a long cable. As a result, the information processing device can accurately calculate the moisture content of food based on the analysis results of the electromagnetic waves that are not affected by cables, etc.

[0077] (Second Aspect) In the moisture measuring device of the first aspect, the antenna and the electromagnetic wave analysis device may be connected within the housing by a signal input / output line (e.g., third signal input / output line CA5). In this case, the electromagnetic wave unit may have a wiring fixing member (e.g., first wiring fixing member 120a) that fixes the signal input / output line. In the moisture measuring device of the second aspect, fixing the signal input / output line to the wiring fixing member makes the bending state of the signal input / output line less likely to change. By making the bending state of the signal input / output line less likely to change, high-frequency signals related to electromagnetic waves can be transmitted and received between the antenna and the electromagnetic wave analysis device without being affected by the signal input / output line. As a result, the moisture content of food can be measured more accurately.

[0078] (Third Aspect) In the moisture measuring device of the first or second aspect, the housing may have a main body (e.g., top surface 11a, side surface 11b, bottom surface 11c) made of stainless steel and an electromagnetic wave window (e.g., electromagnetic wave window 11d) that faces the antenna and allows electromagnetic waves to pass through. In the moisture measuring device of the third aspect, even if the electromagnetic wave unit is installed on a production line, the housing can be prevented from rusting due to water vapor and maintained in a clean state. Furthermore, by making the electromagnetic wave window transparent to electromagnetic waves, electromagnetic waves transmitted from the antenna can be transmitted from the inside of the housing to the outside through the electromagnetic wave window. Furthermore, the electromagnetic waves that have passed through the food can be guided back into the housing through the electromagnetic wave window.

[0079] (Fourth Aspect) In the moisture measuring device of the third aspect, the housing may have a packing (e.g., packing 11e) disposed between the main body and the electromagnetic wave window. In this case, the packing may be made of rubber containing metal. In the moisture measuring device of the fourth aspect, the electromagnetic wave window is fixed to the housing in a gas-tight manner, and even if part of the packing falls into food, this can be quickly detected.

[0080] (Fifth Aspect) In the moisture measuring device of the third or fourth aspect, an inclined surface (e.g., inclined surface 119) inclined relative to the vertical direction may be formed in the portion of the main body where the electromagnetic wave window is located. In the moisture measuring device of the fifth aspect, for example, the gas flow between the food and the electromagnetic wave unit is more likely to reach the electromagnetic wave window, making it more difficult for water vapor in the atmosphere of the production line to come into contact with the electromagnetic wave window. As a result, adhesion of water droplets to the electromagnetic wave window can be suppressed.

[0081] (Sixth Aspect) In the moisture measuring device of any of the first to fifth aspects, the housing may be provided with a pressure adjustment plug (e.g., pressure adjustment plug 116) that equalizes the atmosphere in the internal space housing the antenna and electromagnetic wave analysis device with the atmosphere outside the housing. In the moisture measuring device of the sixth aspect, condensation can be prevented from occurring in the internal space of the housing, and damage to the antenna, electromagnetic wave analysis device, etc. housed in the internal space of the housing due to condensation can be prevented.

[0082] (Seventh Aspect) In any of the moisture measuring devices of the first to sixth aspects, an adhesive may not be provided on the outer surface of the housing. The moisture measuring device of the seventh aspect can eliminate the possibility that the adhesive will peel off from the outer surface of the housing due to deterioration and fall into food.

[0083] (Eighth Aspect) The moisture measuring device of any of the first to seventh aspects may further include a gas flow generating unit (e.g., gas flow generating unit 5) that generates a gas flow between the food and the electromagnetic wave unit. In the moisture measuring device of the eighth aspect, water vapor can be removed from the electromagnetic wave propagation path between the electromagnetic wave unit and the food, making the electromagnetic waves less susceptible to the influence of water vapor. As a result, the moisture percentage of food SA can be measured more accurately.

[0084] (Ninth Aspect) In the moisture measuring device of any of the first to eighth aspects, the antenna may have a first terminal (e.g., first terminal 13a) for connecting to an electromagnetic wave analysis device. In this case, the electromagnetic wave analysis device may be disposed in the internal space of the housing on the opposite side of the protruding direction of the first terminal. This prevents the distance between the terminal for connecting the electromagnetic wave analysis device to the antenna (e.g., second terminal 15a) and the first terminal of antenna 13 from becoming too small, and allows the signal input / output wires to be accommodated in the internal space of the housing without being bent too tightly.

[0085] DESCRIPTION OF SYMBOLS 100: Moisture measuring device 1: Electromagnetic wave unit 11: Housing 11a: Top surface 11b: Side surface 11c: Bottom surface 11d: Electromagnetic wave window 11e: Gasket 111: Mounting portion 112: Lid 113: First wiring outlet portion 114: Second wiring outlet portion 115: Third wiring outlet portion 116: Pressure adjusting plug 117a: First protrusion 117b: Second protrusion 118: Antenna fixing portion 119: Inclined surface 120a: First wiring fixing member 120b: Second wiring fixing member 13: Antenna 13a: First terminal 15: Electromagnetic wave analysis device 15a: Second terminal 17: Temperature sensor 3: Information processing device 5: Gas flow generating portion 7: Production line CA1: First signal input / output line CA2: Power supply line CA3: Second signal input / output line CA4: Wiring CA5: Third signal input / output line SA: Food

Claims

1. A moisture measuring device for measuring the moisture content of cooked food placed on a production line on which the food is placed, comprising: an antenna for transmitting electromagnetic waves toward the food placed on the production line and receiving the electromagnetic waves that have passed through the food; an electromagnetic wave analysis device for analyzing the received electromagnetic waves; and an information processing device for calculating the moisture content of the food based on the analysis results of the electromagnetic waves by the electromagnetic wave analysis device, wherein the antenna and the electromagnetic wave analysis device are housed in a single housing to form an electromagnetic wave unit, and the electromagnetic wave unit is connected to the information processing device so as to be able to communicate with the information processing device.

2. The moisture measuring device according to claim 1, wherein the antenna and the electromagnetic wave analysis device are connected by a signal input / output line within the housing, and the electromagnetic wave unit has a wiring fixing member for fixing the signal input / output line.

3. The moisture measuring device according to claim 1, wherein the housing has a main body made of stainless steel and an electromagnetic wave window that faces the antenna and allows the electromagnetic waves to pass through.

4. The moisture measuring device according to claim 3, wherein the housing has a packing disposed between the main body and the electromagnetic wave window, the packing being made of rubber containing metal.

5. The moisture measuring device according to claim 3, wherein a surface inclined relative to the vertical direction is formed in the portion of the main body where the electromagnetic wave window is disposed.

6. A moisture measuring device as described in claim 1, wherein the housing is provided with a pressure adjusting plug that equalizes the atmosphere of the internal space housing the antenna and the electromagnetic wave analysis device with the atmosphere outside the housing.

7. The moisture measuring device according to claim 1, wherein the outer surface of the housing is not provided with any adhesive.

8. The moisture measuring device according to claim 1, further comprising a gas flow generating section that generates a gas flow between the food and the electromagnetic wave unit.

9. The moisture measuring device according to claim 1, wherein the antenna has a first terminal for connecting to the electromagnetic wave analysis device, and the electromagnetic wave analysis device is positioned in the internal space of the housing on the opposite side to the protruding direction of the first terminal.

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