JP7339663B2 - Gas concentration measuring method for sealed packaging container and gas concentration measuring device used therefor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gas concentration measuring method for a sealed packaging container capable of measuring the concentration of a specific gas in the sealed packaging container with high accuracy, and a gas concentration measuring device used therefor.

2. Description of the Related Art Conventionally, sealed packaging containers such as gas-replaced and sealed retort molded containers (for example, retort cooked rice packs) have been widely used.
In the packaging process of this type of sealed packaging container, after removing the oxidizing gas (e.g., oxygen) remaining in the head space that may shorten the storage period or shelf life of the packaged product, nitrogen, carbon dioxide, etc. are removed. Gas-replacement packaging in which the gas is replaced with an inert gas and sealed is performed (Patent Document 1). As a result, the oxidation-causing gas in the sealed packaging container is removed, and the packaged items, particularly foods, can be preserved for a long period of time and kept fresh for a long time.

In the inspection process after gas replacement packaging, an inspection is performed to see if the concentration of oxidizing gases, especially oxygen, is below a predetermined value. This is a sampling inspection in which the composition of a small amount of gas sucked from the sealed packaging container is inspected by inserting a hypodermic needle into the sealed packaging container selected in the first step. In this sampling inspection, sealed packaging containers with injection marks must be discarded. Moreover, if the number of samples is increased in order to improve the inspection accuracy, the inspection time becomes longer, and the increased amount of waste causes an increase in economic and time loss. Furthermore, when the head space in which there is no object to be packaged is narrow in the sealed packaging container, measurement of the gas concentration is extremely difficult because the object to be packaged interferes with the measurement.

Japanese Patent No. 3742042

Therefore, an object of the present invention is to measure the gas concentration of a specific gas inside a sealed packaging container with high accuracy without damaging the sealed packaging container, even if the head space where there is no package is narrow. An object of the present invention is to provide a measuring method and a gas concentration measuring device used therefor.

To solve the above-mentioned problems, there is provided a gas concentration measuring method for measuring the concentration of a specific gas in a sealed packaging container filled with an item to be packaged, replaced with gas, and packaged, using a gas concentration measuring device, the sealed packaging container. has a main body portion internally provided with a space for filling an item to be packaged, and a portion to be measured having a communication portion communicating with the head space in the main body portion and a space for transmitting a laser beam, wherein the main body portion is The space for transmitting laser light of the portion to be measured is formed in an elongated shape along the direction in which one side surface of the body portion extends, and extends outside the body portion. The gas concentration measuring device, which is separately provided adjacently, includes a laser generator that emits a laser beam of a specific wavelength, a laser receiver that receives the laser beam, and a laser beam of a specific wavelength that is sent to the sealed packaging container. a laser type gas concentration meter for measuring the gas concentration of the specific gas remaining inside the sealed packaging container by passing through the measurement target portion, wherein the laser beam emitted from the laser generation portion is emitted to the measurement target portion; A gas concentration measuring method for a sealed packaging container, characterized in that the laser beam transmitted through the transmission space is transmitted in an oblique direction with respect to the longitudinal direction of the laser beam transmission space and then made incident on the laser light receiving part. (Claim 1). Further, to solve the above problems, there is provided a gas concentration measuring method for measuring the concentration of a specific gas in a sealed packaging container filled with an item to be packaged, replaced with gas, and packaged, using a gas concentration measuring device. The packaging container has a main body portion having a space for filling an object to be packaged therein, and a measuring portion having a communication portion communicating with a head space in the main body portion and having a space for transmitting a laser beam, the main body The portion is configured in a rectangular parallelepiped shape, and the laser light transmission space of the portion to be measured is formed in an elongated shape along the direction in which one side surface of the main body portion extends, and The gas concentration measuring device is partitioned by a partition plate portion, and includes a laser generator that emits laser light of a specific wavelength, a laser light receiver that receives the laser light, and the laser light of the specific wavelength that is sealed. a laser type gas densitometer for measuring the gas concentration of the specific gas remaining inside the sealed packaging container by passing it through the measured portion of the packaging container, wherein the laser is emitted from the laser generation portion to measure the measured portion. Gas in a sealed packaging container, characterized in that the laser light transmitted through the laser light transmission space is transmitted in an oblique direction with respect to the longitudinal direction of the laser light transmission space and then made incident on the laser light receiving part. A concentration measuring method (claim 2).

Furthermore, what solves the above-mentioned problems is a gas concentration measuring device for measuring the concentration of a specific gas in a sealed packaging container filled with an item to be packaged, replaced with gas, and packaged,
The hermetically sealed packaging container has a main body portion internally provided with a space for filling an object to be packaged, and a measurement target portion having a communication portion communicating with a head space in the main body portion and a space for transmitting a laser beam, The body portion is configured in a rectangular parallelepiped shape, and the laser light transmission space of the portion to be measured is formed in an elongated shape along a direction in which one side surface of the body portion extends. provided separately adjacent to the outside of the
The gas concentration measuring device includes a laser generator that emits a laser beam of a specific wavelength, a laser receiver that receives the laser beam, and a laser beam of the specific wavelength that passes through the measurement target portion of the sealed packaging container. and a laser type gas concentration meter for measuring the gas concentration of the specific gas remaining inside the sealed packaging container, and the said The gas concentration measuring apparatus is characterized in that the laser beam is transmitted obliquely to the longitudinal direction of the space for transmitting the laser beam, and then made incident on the laser light receiving portion (Claim 3). Furthermore, what solves the above problems is a gas concentration measuring device for measuring the concentration of a specific gas in a sealed packaging container filled with an item to be packaged, replaced with gas, and packaged, wherein the sealed packaging container has an internal a main body portion having a space for filling an object to be packaged in the main body portion; The laser light transmitting space of the portion to be measured is formed in an elongated shape along the direction in which one side surface of the main body extends, and is partitioned within the main body by a partition plate. The gas concentration measuring device includes a laser generator that emits a laser beam of a specific wavelength, a laser receiver that receives the laser beam, and a laser beam of a specific wavelength that passes through the cover of the sealed packaging container. and a laser type gas concentration meter for measuring the gas concentration of the specific gas remaining inside the sealed packaging container by passing it through a measuring part, and for transmitting the laser light emitted from the laser generating part to the part to be measured. The gas concentration measuring apparatus is characterized in that the laser light passing through the space is transmitted in a direction oblique to the longitudinal direction of the space for transmitting the laser light, and then made incident on the laser light-receiving part (claim 4). ).

According to the gas concentration measuring method of claim 1 or 2 , the concentration of the specific gas inside can be measured with high accuracy without damaging the sealed packaging container, even if the head space where there is no packaged object is narrow. can do. Moreover, the optical path length of the laser beam can be made longer, and the concentration of the specific gas inside the sealed packaging container can be measured with higher accuracy.
According to the gas concentration measuring device according to claim 3 or 4 , the concentration of the specific gas inside can be measured with high accuracy without damaging the sealed packaging container, even if the head space where there is no packaged object is narrow. can do. Moreover, the optical path length of the laser beam can be made longer, and the concentration of the specific gas inside the sealed packaging container can be measured with higher accuracy.

FIG. 3 is an explanatory diagram for explaining the action of one embodiment of the sealed packaging container used in the gas concentration measuring method of the present invention; Fig. 2 is a front view of the sealed packaging container shown in Fig. 1; Fig. 2 is a right side view of the sealed packaging container shown in Fig. 1; FIG. 2 is a plan view of the sealed packaging container shown in FIG. 1; FIG. 2 is a front view showing how the sealed packaging container shown in FIG. 1 is used; 1 is a front view of an embodiment of a gas concentration measuring device used in the gas concentration measuring method of the present invention; FIG. FIG. 7 is a plan view of the gas concentration measuring device shown in FIG. 6; FIG. 7 is a right side view of the gas concentration measuring device shown in FIG. 6;

In the present invention, the laser light emitted from the laser generating section 11 and transmitted through the laser light transmitting space 6 of the measured portion 7 is transmitted obliquely through the laser light transmitting space 6 of the measured portion 7. A sealed packaging container in which the density of a specific gas inside can be measured with high accuracy without damaging the sealed packaging container by making it incident on the laser light receiving part 12 later, even if the head space where there is no packaged object is narrow. A gas concentration measuring method and a gas concentration measuring device were realized.

An embodiment of the method for measuring the gas concentration of a sealed packaging container according to the present invention will be described with reference to the embodiment shown in FIGS. 1 to 8. FIG.
The method for measuring the gas concentration of a sealed packaging container of this embodiment uses a gas concentration measuring device 10 to measure the concentration of a specific gas in a sealed packaging container 1 filled with an item S to be packaged, replaced with gas, and packaged. In this method, a sealed packaging container 1 has a main body 3 having a space 2 for filling an object to be packaged therein, a communication part 5 communicating with a head space 4 in the main body 3, and a space 6 for transmitting a laser beam. The gas concentration measuring device 10 includes a laser generator 11 that emits a laser beam of a specific wavelength, a laser receiver 12 that receives the laser beam, and the laser beam of a specific wavelength. and a laser type gas concentration meter 13 for measuring the gas concentration of the specific gas remaining inside the sealed packaging container 1 by transmitting it through the measured part 7 of the sealed packaging container 1, The laser light passing through the laser light transmission space 6 of the measurement part 7 is transmitted obliquely to the laser light transmission space 6 of the measured part 7 and then made incident on the laser light receiving part 12. This is a method for measuring the gas concentration in a sealed packaging container. Details will be described below.

The sealed packaging container 1 of this embodiment is a container for retort cooked rice, and the specific gas inside is oxygen. However, the sealed packaging container is not limited to this, and as shown in FIG. Therefore, it broadly includes sealed packaging containers in which the gas concentration cannot be measured with high accuracy, and also includes sealed packaging containers containing specific gases other than oxygen.

Inside the body portion 3, there is provided an object filling space 2 for filling the object to be packaged (cooked rice in this embodiment) S. In this embodiment, the main body portion 3 and the object filling space 2 has a substantially rectangular parallelepiped shape, but the shape is not limited to a rectangular parallelepiped, and may be of any shape.

The portion to be measured 7 has a space 6 for transmitting laser light therein, and is a portion for measuring the concentration of a specific gas by transmitting laser light. It is provided adjacent to the main body portion 3 via 5 . However, although the part to be measured 7 in this embodiment is provided separately adjacent to the main body part 3, it is not limited to this, and the concentration of a specific gas can be measured by transmitting a laser beam. Any form may be used as long as it exists, and for example, a space for filling an object to be packaged and a space for transmitting a laser beam are separated from each other by a partition plate in the main body. It should be noted that the portion to be measured 7 preferably has a structure in which only the gas in the headspace 4 moves through the communicating portion 5, but moisture and A very small amount of the item to be packaged S may migrate.

The sealed packaging container 1 of this embodiment is integrally formed of a transparent material (such as polypropylene) in order to allow laser light to pass through the measured portion 7 to measure the concentration of the specific gas. However, the sealed packaging container of the present invention is not limited to this. The body portion and/or the portion to be measured may be formed of a material capable of transmitting laser light of a specific wavelength. In the present application, the term “transparent material” broadly includes transparent or translucent materials regardless of whether or not they are colored. In addition, in the present application, a material capable of transmitting a laser beam of a specific wavelength refers to a material capable of transmitting a laser beam of a specific wavelength regardless of whether it is transparent or translucent, whether or not it is a material, pattern, letter or figure, or colored. broadly encompasses

Moreover, it is preferable that the laser light transmitting space 6 of the measured portion 7 is formed in an elongated shape as in this embodiment. As a result, a longer optical path length of the laser light can be ensured, and the measurement accuracy of the specific gas concentration can be improved. A film F is adhered to the upper surface of the sealed packaging container 1 of this embodiment, so that the space 2 filled with the packaged material, the communicating portion 5 and the space 6 for transmitting laser light are kept in a sealed state.

The gas concentration measuring method of this embodiment is a method of measuring the gas concentration of a specific gas remaining in the sealed packaging container 1. It is carried out in the inspection process of a packaging machine such as a rotary type or pillow type packaging machine having various processes related to.

In the gas concentration measuring method of this embodiment, the residual specific gas is oxygen gas (O ₂ ). In the packaging process of the packaging machine which is performed in an air atmosphere, the inside of the sealed packaging container 1 is also filled with the atmosphere when the items to be packaged are filled.

Oxidation-causing gases such as oxygen gas contained in the atmosphere oxidize and deteriorate packaged items, especially foods. Therefore, in the packaging machine, after the packaging process of filling the sealed packaging container with the items to be packaged, the atmosphere is evacuated from the sealed packaging container, and an inert gas such as nitrogen gas (N ₂ ) or carbon dioxide gas is used. A gas purge step is provided to replace (CO ₂ ).

After that, the method of measuring the gas concentration of the oxygen gas in the gas-replaced sealed packaging container 1 and inspecting whether the gas concentration is below the reference value is the gas concentration measuring method according to the present embodiment. When the gas concentration of oxygen gas is measured, if the gas concentration is below the reference value, the gas replacement is performed normally and the sealed packaging container 1 is filled with inert gas, so the package is packed. can be prevented from oxidizing, and the shelf life and shelf life can be extended. On the other hand, if the gas concentration exceeds the standard value, the product is determined to be defective and is discharged, for example, in the packaging process (defective product discharge process) of the packaging machine.

As shown in FIG. 6, the gas concentration measuring apparatus 10 used in the gas concentration measuring method of this embodiment includes a laser generator 11 for emitting laser light and a laser light receiving section 12 for receiving laser light. It has a type gas concentration meter 13 .

The laser type gas concentration meter 13 is formed so as to be able to analyze a specific gas by wavelength-tunable semiconductor laser absorption spectroscopy.

Here, Tunable Diode Laser Absorption Spectroscopy (TDLAS) is a gas containing a specific gas to be measured and a predetermined incident light intensity related to laser light output from a semiconductor laser element. In this method, the transmittance is obtained from the transmitted light intensity of the laser light after passing through a cell that is sealed and absorbed by the specific gas, and the gas concentration is measured from the absorbance of the laser light based on the transmittance. .

It is known that each gas, including specific gases, has its own absorption wavelength band, and that absorption wavelength band includes a plurality of absorption lines related to wavelengths that absorb light more strongly. TDLAS modulates and amplifies the wavelength of the output laser light in the near-infrared region so that it matches the specific wavelength associated with one of the multiple absorption lines of the specific gas to be measured. is configured to Then, the gas concentration is measured by determining the absorbance of the laser beam based on the absorption spectrum of the specific wavelength that changes before and after the cell is transmitted. In this embodiment, the gas to be measured is oxygen gas, and the sealed packaging container 1 is the cell that seals the gas to be measured.

The laser generation unit 11 has a laser light source and a control unit that sets the wavelength of the laser light emitted from the laser light source to a specific wavelength and adjusts the light intensity to a predetermined light intensity.
The laser light source includes a semiconductor laser element composed of a diode whose wavelength can be changed, and is formed so as to be capable of outputting laser light in the near-infrared region. The control unit adjusts the wavelength of the laser light output from the semiconductor laser element to a specific wavelength unique to the specific gas to be measured, and controls amplification so that the laser light is emitted with a predetermined incident light intensity. is formed in

Here, since the specific gas measured by the laser type gas concentration meter 13 according to the present embodiment is oxygen gas, the absorption wavelength band peculiar to the oxygen gas is the 760 nm band. A specific wavelength associated with one of the absorption lines is selected as the output wavelength of the laser light.

The laser generator 11 is housed in a first housing 15 , and the first housing 15 has a laser emission window 16 . A sapphire glass that easily transmits light in the near-infrared region is fitted in the laser emission window 16 . The laser generator 11 is formed to emit laser light from the first housing 15 through the laser emission window 16 .

The inside of the first housing 15 is formed so that it can be evacuated or gas replaced (gas purge) in order to remove a specific gas, oxygen gas in this embodiment. Therefore, the inside of the first housing 15 can be maintained in a vacuum or filled with an inert gas such as nitrogen gas or carbon dioxide. As a result, it is possible to prevent the laser light from being absorbed by the specific gas in the first housing 15 before it is emitted from the laser light source through the laser emission window 16, thereby improving the accuracy of gas concentration measurement. can be made

The laser light receiving section 12 has a light receiving sensor for receiving the laser light transmitted through the measured portion 7 of the sealed packaging container 1 and a measuring section for measuring the gas concentration based on the light receiving signal from the light receiving sensor.

The light-receiving sensor is composed of an element such as a photodiode that converts the transmitted light intensity of the laser beam transmitted through the measured portion 7 of the sealed packaging container 1 into an electrical transmitted light signal. Thereby, the transmitted light intensity of the laser beam transmitted through the measured portion 7 of the sealed packaging container 1 can be electrically processed.

The measurement unit calculates the transmittance based on the transmitted light signal related to the transmitted light intensity and the incident light signal related to the incident light intensity of the laser light output from the laser generation unit 11, and measures the laser light based on the calculated transmittance. , and based on the absorbance, the concentration of the specific gas in the portion to be measured 7 of the sealed packaging container 1 is measured.

The laser light receiving section 12 is built in the second housing 17 . The second housing 17 has a laser receiving window 18 . Similar to the laser emission window 16, the laser reception window 18 is fitted with sapphire glass that easily transmits light in the near-infrared region. Thus, the laser light receiving portion 12 is formed to receive the laser light that has passed through the measured portion 7 of the sealed packaging container 1 through the laser light receiving window portion 18 .

Similarly to the first housing 15, the inside of the second housing 17 is also formed so that it can be evacuated or replaced with gas. Therefore, it is possible to prevent the laser light from being absorbed by the specific gas in the second housing 17 until the laser light is received by the light receiving sensor through the laser light receiving window 18. Gas concentration measurement can be performed. can improve the accuracy of

In this manner, the laser gas concentration meter 13 emits a laser beam from the laser generator 11 through the laser emission window 16, and transmits the laser beam into the measured portion 7 of the sealed packaging container 1 to be measured. The laser light-receiving portion 12 receives the laser beam transmitted through the measured portion 7 of the sealed packaging container 1 through the laser-receiving window portion 18 .

Then, the gas concentration measuring device 10 having the laser type gas concentration meter 13 detects the laser light emitted from the laser generating part 11 and transmitted through the laser light transmission space 6 of the part 7 to be measured. It is configured to be incident on the laser light receiving section 12 after being transmitted obliquely to the working space 6 .

Next, a specific operation of the gas concentration measuring method and the gas concentration measuring apparatus of the present invention will be explained using an embodiment shown in the drawings.

In the gas concentration measuring method and the gas concentration measuring apparatus 10 of the present invention, the sealed packaging containers 1 placed on the belt Y of the conveyor W are intermittently conveyed sequentially, as shown in FIG. 6 or 7 . The sealed packaging container 1 is placed on the belt Y so that the longitudinal direction of the portion to be measured 7 of the sealed packaging container 1 is conveyed in the conveying direction (arrow H direction) in FIG.

Then, when the part to be measured 7 of the sealed packaging container 1 reaches the vicinity of the site where the gas concentration measuring device 10 is installed, the first housing 15 and the second housing 15 of the gas concentration measuring device 10 are arranged as shown in FIG. 6 or FIG. The housing 17 is moved from above and below by a first reciprocating mechanism (including a first cylinder 21) 19 or a second reciprocating mechanism (including a second cylinder 22) 20, so that the upper and lower surfaces of the part to be measured 7 are moved. pinch. At this time, the laser emitting window portion 16 and the laser receiving window portion 18 are configured to come into surface contact with oblique positions on the upper and lower surfaces of the measured portion 7 respectively.

After the laser emitting window portion 16 and the laser receiving window portion 18 are brought into surface contact with the upper and lower surfaces of the portion to be measured 7 of the sealed packaging container 1, the sealed packaging is carried out from the laser generating portion 11 through the laser emitting window portion 16. A laser beam is emitted to the measured portion 7 of the container 1 from below. The laser beam travels obliquely upward in the laser beam transmitting space 6 of the measured portion 7 and is received by the laser receiving portion 12 through the laser receiving window portion 18 of the second housing 17 .

The light receiving sensor of the laser light receiving section 12 converts the laser light transmitted through the measured portion 7 of the sealed packaging container 1 into an electronic transmitted light signal, and the transmitted light signal is output to the measuring section. The measurement unit acquires the transmitted light signal and the incident light signal obtained by electronically converting the laser light emitted by the laser generation unit 11, compares the transmitted light signal and the incident light signal, and determines the sealed packaging container of the laser light. 1, the transmittance T for the measured portion 7 is measured. Then, based on the transmittance T, the absorbance of the absorption spectrum of the specific wavelength of the laser light absorbed by the specific gas in the measured portion 7 of the sealed packaging container 1 is calculated, and based on the absorbance, the sealed packaging container 1 The gas concentration of the specific gas in the measured portion 7 is measured.

In this embodiment, the first housing 15 is arranged below the portion to be measured 7 of the sealed packaging container 1, and the second housing 17 is arranged above the portion to be measured 7 of the sealed packaging container 1. However, it is not limited to this, and the scope of the present invention includes a wide range of devices that can obliquely impinge the laser beam on the portion 7 to be measured of the sealed packaging container 1. For example, the first housing 15 is It may be arranged above the part to be measured 7 of the sealed packaging container 1 and the second housing 17 may be arranged below.

1 Sealed packaging container 2 Filled space for packaged material 3 Body portion 4 Head space 5 Communicating portion 6 Space for laser light transmission 7 Part to be measured 10 Gas concentration measuring device 11 Laser generating portion 12 Laser light receiving portion 13 Laser type gas concentration meter 15 1 housing 16 laser emitting window 17 second housing 18 laser receiving window 19 first reciprocating mechanism 20 second reciprocating mechanism 21 first cylinder 22 second cylinder F film w conveyor Y belt S to-be-packaged

Claims (4)

A gas concentration measuring method for measuring, by a gas concentration measuring device, the concentration of a specific gas in a sealed packaging container in which an object to be packaged is filled, gas-exchanged, and packaged,
The hermetically sealed packaging container has a main body portion internally provided with a space for filling an object to be packaged, and a measurement target portion having a communication portion communicating with a head space in the main body portion and a space for transmitting a laser beam,
The body portion is configured in a rectangular parallelepiped shape, and the laser light transmission space of the portion to be measured is formed in an elongated shape along a direction in which one side surface of the body portion extends. provided separately adjacent to the outside of the
The gas concentration measuring device includes a laser generator that emits a laser beam of a specific wavelength, a laser receiver that receives the laser beam, and a laser beam of the specific wavelength that passes through the measurement target portion of the sealed packaging container. and a laser gas concentration meter for measuring the gas concentration of the specific gas remaining inside the sealed packaging container,
The laser light emitted from the laser generating section and transmitted through the laser light transmitting space of the measured portion is transmitted in a direction oblique to the longitudinal direction of the laser light transmitting space, and then transmitted to the laser light receiving section. A method for measuring the gas concentration of a sealed packaging container, characterized by making the gas incident. A gas concentration measuring method for measuring, by a gas concentration measuring device, the concentration of a specific gas in a sealed packaging container in which an object to be packaged is filled, gas-exchanged, and packaged,
The hermetically sealed packaging container has a main body portion internally provided with a space for filling an object to be packaged, and a measurement target portion having a communication portion communicating with a head space in the main body portion and a space for transmitting a laser beam,
The body portion is configured in a rectangular parallelepiped shape, and the laser light transmission space of the portion to be measured is formed in an elongated shape along a direction in which one side surface of the body portion extends. It is divided by the division board part in the part and provided,
The gas concentration measuring device includes a laser generator that emits a laser beam of a specific wavelength, a laser receiver that receives the laser beam, and a laser beam of the specific wavelength that passes through the measurement target portion of the sealed packaging container. and a laser gas concentration meter for measuring the gas concentration of the specific gas remaining inside the sealed packaging container,
The laser light emitted from the laser generating section and transmitted through the laser light transmitting space of the measured portion is transmitted in a direction oblique to the longitudinal direction of the laser light transmitting space, and then transmitted to the laser light receiving section. A method for measuring the gas concentration of a sealed packaging container, characterized by making the gas incident. A gas concentration measuring device for measuring the concentration of a specific gas in a sealed packaging container filled with an item to be packaged, gas replaced, and packaged,
The hermetically sealed packaging container has a main body portion internally provided with a space for filling an object to be packaged, and a measurement target portion having a communication portion communicating with a head space in the main body portion and a space for transmitting a laser beam,
The body portion is configured in a rectangular parallelepiped shape, and the laser light transmission space of the portion to be measured is formed in an elongated shape along a direction in which one side surface of the body portion extends. provided separately adjacent to the outside of the
The gas concentration measuring device includes a laser generator that emits a laser beam of a specific wavelength, a laser receiver that receives the laser beam, and a laser beam of the specific wavelength that passes through the measurement target portion of the sealed packaging container. and a laser gas concentration meter for measuring the gas concentration of the specific gas remaining inside the sealed packaging container,
The laser light emitted from the laser generating section and transmitted through the laser light transmitting space of the measured portion is transmitted in a direction oblique to the longitudinal direction of the laser light transmitting space, and then transmitted to the laser light receiving section. A gas concentration measuring device characterized by making it incident. A gas concentration measuring device for measuring the concentration of a specific gas in a sealed packaging container filled with an item to be packaged, gas replaced, and packaged,
The hermetically sealed packaging container has a main body portion internally provided with a space for filling an object to be packaged, and a measurement target portion having a communication portion communicating with a head space in the main body portion and a space for transmitting a laser beam,
The body portion is configured in a rectangular parallelepiped shape, and the laser light transmission space of the portion to be measured is formed in an elongated shape along a direction in which one side surface of the body portion extends. It is divided by the division board part in the part and provided,
The gas concentration measuring device includes a laser generator that emits a laser beam of a specific wavelength, a laser receiver that receives the laser beam, and a laser beam of the specific wavelength that passes through the measurement target portion of the sealed packaging container. and a laser gas concentration meter for measuring the gas concentration of the specific gas remaining inside the sealed packaging container,
The laser light emitted from the laser generating section and transmitted through the laser light transmitting space of the measured portion is transmitted in a direction oblique to the longitudinal direction of the laser light transmitting space, and then transmitted to the laser light receiving section. A gas concentration measuring device characterized by making it incident.

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