JPS6242035A - Drying degree detecting device for leaf tobacco - Google Patents

Abstract

PURPOSE:To execute the measurement correctly with a simple device by irradiating the light to the leaf of the leaf tobacco, detecting the strength of the wavelength of the prescribed area of the reflecting light, outputting the absorbance from the comparison with the reflecting strength of the reference dry white paper and measuring the drying degree from the size. CONSTITUTION:The light from a light source lamp 1b is focused by a lens 1c, and the light is discontinued by a light chopper 1f rotated at the constant speed by a motor 1e. The light to pass through a lens 1d is irradiated to a leaf tobacco A hung in the drying room, and the reflecting light is focused to a spectral part through natural lighting lenses lg1 and lg2. The focused light is made into the light having the prescribed wavelength of the reflecting light by using filters 2a1, 2a2, the strength of the light of respective wavelengths passing through the filter is detected by detecting devices 3a1 and 3a2, changed to the electric signal and sent to an arithmetic measuring part 4. At the calculating part 4, by obtaining the absorbance from the comparison with the reflecting strength of the reference dry white paper and the reflecting strength of the measured value, the correct measurement can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting the degree of dryness of leaf tobacco in a drying chamber.

[Conventional technology]

As is well known, drying of leaf tobacco in a drying room requires
It usually takes 100 hours. During this time, the degree of yellowing and dryness of the leaf tobacco was observed by the operator's eyes, and the temperature and humidity inside the drying chamber were adjusted as necessary based on the observation results. However, there are individual differences in such visual observation by workers, and even in the case of the same person, observation errors occur depending on the physical condition of the day, and temperature and humidity adjustment differs depending on the type of leaf tobacco. There were problems that could only be solved by experts with many years of experience. Therefore, in order to solve these problems,
Inventions disclosed in Japanese Patent Publication No. 2-34999, Japanese Patent Publication No. 56-15220, etc. were proposed. The gist of these inventions is to detect the degree of dryness of leaf tobacco based on changes in the weight of leaf tobacco, that is, the moisture removal rate in leaf tobacco, and to control the temperature and humidity in the drying chamber based on the detection results. . Although such a detection device can detect the degree of dryness with a certain degree of accuracy, there is a problem in that the device becomes complicated because the weight must be measured accurately.

[Means for solving problems]

In view of the above circumstances, this invention continuously detects the degree of dryness, which is the most important point along with the degree of yellowing in controlling the temperature and humidity of leaf tobacco during drying, by measuring the reflection spectrum of leaf tobacco using a simple device. The purpose is to do so, and the specific technical means thereof include an illumination detection section that irradiates a predetermined area of leaf tobacco with light emitted from a light source lamp and collects the reflected light, and the illumination detection section. a spectroscope that separates the light collected by the spectrometer, a photodetector that detects the intensity of a wavelength in a predetermined region of the light separated by the spectroscope and converts it into an electrical signal, and an electric signal from the photodetector. a calculation and measurement section that amplifies the target signal among the signals and performs necessary calculations;
and an output section that outputs the results of calculations performed by the calculation and measurement section.

[For production]

According to the present invention having the above configuration, light from the light source lamp is irradiated onto the leaf tobacco through the illumination detection section, and the reflected light is collected and input to the spectroscopic section. In this spectroscopy section, the reflected light from the leaf tobacco is divided into spectra, and only the intensity of the necessary wavelength is converted into an electrical signal by the photodetection section and sent to the calculation measurement section. After the calculation and measurement section performs necessary calculations based on these input values, the operator outputs the degree of dryness at the output section. Based on this output value, the operator controls the temperature and humidity in the drying chamber.

〔Example〕

Embodiments of this invention will be described below based on the drawings.

The first embodiment shown in FIGS. 1 and 2 includes an illumination detection section 1,
It is composed of a spectroscopic section 2, a light detection section 3, an arithmetic measurement section 4, and an output section 5.

The illumination detection unit l collects light emitted from a light source lamp Ib illuminated by a current supplied from a power source 1a with a second lens 1d, and intermittents the light with an optical chopper 1f rotated at a constant speed by a motor le. The light passing through the second lens 1d is irradiated onto the leaf tobacco A suspended in the drying chamber, and the reflected light is focused on the spectrometer 2 via the lighting lenses Igl and 1g2. .

The reason why the light chopper 1f was provided is that the light emitted from the light source lamp 1b belongs to the near-infrared region and is therefore susceptible to the effects of temperature and thermal radiation, so by intermittent light, this effect can be eliminated. be. The use of quartz halogen for the light source lamp 1a is optimal because it emits a continuous spectrum in the visible and near infrared regions and has excellent stability and long life, but is not limited thereto.

The spectroscopic section 2 is equipped with a first filter 28 and a second filter 2a2 that allow the reflected light having wavelengths of 1440 nm and 1600 nm to pass through the light collected by the illumination detection section 1, respectively.

The photodetecting unit 3 includes these first filters 2al and 2nd filters.
The intensity of the light of each wavelength that has passed through the filter 2a2 is converted into an electric signal by each detector 3al, 3a2, and sent to the calculation measurement section 4. As a specific example of the detectors 3al and 3a2, Ge photodiodes are suitable.

The arithmetic measurement unit 4 converts the electrical signals from the detectors 3al and 3a2 into a tuned amplifier circuit and a synchronous rectifier circuit 4al, respectively.
, 4a2 selectively amplify the target signal, convert it into a DC signal, input it to the arithmetic circuit 4b, perform necessary arithmetic operations, and output the result to the output section 5.

This calculation is performed as follows. That is, as shown in Figure 4, the absorbance is measured by measuring the light on a pre-dried white paper at the position of the leaf tobacco, and storing the reflection intensity value Io for each wavelength as a reference value. It is expressed as the inverse logarithm of the ratio of the reflection intensity value for each wavelength from leaf tobacco. Expressed in the formula, absorbance - 1 og ÷ - (1).

In the arithmetic and measurement unit 4, since such comparison calculations with dry white paper cannot be performed in real time, instead of the measured values of this dry white paper, the value of the intensity of light at a wavelength with no absorption, that is, 1440 nm, is used. is the standard value 1o,
The value of the intensity of light having a wavelength of 1600 nm in the absorption band of chlorophyll is respectively set as I, and the above equation (1) is calculated to calculate the absorbance, that is, the degree of dryness.

Note that even if the wavelengths of these lights are slightly shifted back and forth, the degree of dryness can be measured, so the wavelengths are not limited to the above wavelengths.

The output section 5 includes a display 5a electrically connected to the arithmetic circuit 4b of the arithmetic and measurement section 4, a recording needle of a pen recorder, and the like. The display 5a is connected to the arithmetic circuit 4b.
The calculated results, that is, the absorbance (dryness) at a wavelength of 1440 nm, are numerically displayed and monitored. Furthermore, with a recording needle such as a pen recorder, it is also possible to record changes over time on recording paper, as shown in FIG. If the arithmetic circuit 4b is also connected to the temperature needle and humidity needle of the drying room, these can be monitored at the same time and centralized control can be performed.

As in the second embodiment shown in FIG. 3 and FIG. By increasing the number of adjustment flow circuits, the lighting lens 1g3.1g4 and the third filter 2
a3.2a4, a detector 3a3.3a4, a tuned amplifier circuit, and a tuned flow circuit 4a2.4a3, in addition to the above two specific wavelengths necessary for calculating the yellowing index, light at two other wavelengths can be generated. It also becomes possible to measure strength. Therefore, these two wavelengths can be converted to, for example, the wavelength 660 required for calculating the degree of yellowing.
By adjusting to r+TI and 900 nm,
Along with dryness, it is also possible to measure the degree of yellowing, which is an important point in controlling the temperature and humidity of leaf tobacco.

According to the apparatus of the present invention having the above configuration, light from the light source lamp 1b is irradiated onto the leaf tobacco A through the lenses 1c and 1d, and the reflected light is collected by the lighting lenses Igl and 1g2 and is incident on the spectrometer 2.

In the spectroscopy section 2, the reflected light from the leaf tobacco A is separated into spectra, and only the intensity of the necessary wavelength is converted into an electrical signal by the photodetection section 3 and sent to the calculation and measurement section 4. After the calculation and measurement section 4 performs necessary calculations based on these input values, the output section 5 outputs the degree of dryness. The operator controls the temperature and humidity inside the drying chamber based on this output value.

〔Effect of the invention〕

As is clear from the above description, the tobacco dryness detection device of the present invention radiates light onto tobacco leaves and detects the intensity of the wavelength of this reflected light in a predetermined region, It outputs absorbance, which is the inverse logarithm of the reflection intensity of , that is, the ratio of the intensity of wavelengths with no absorption, and measures the degree of dryness based on the magnitude of this absorbance. Therefore, very accurate measurements can be made with a simple device. Moreover, if you monitor it on the display, you can always know the current degree of dryness, and in addition, it is also possible to output this as a graph over time, so you can quickly adjust the temperature and humidity in the drying room based on this information. It can be performed. Furthermore, by preparing data on the relationship between absorbance, that is, dryness, and temperature and humidity conditions for each type of leaf tobacco, even an inexperienced worker can easily carry out the work and obtain uniform, high-quality leaf tobacco. be able to. Furthermore,
If the relationship between the degree of dryness and the temperature and humidity conditions in the drying chamber is stored in advance for each type of leaf tobacco in the temperature and humidity control mechanism, the output information from the output section will be automatically controlled every time the output information is input to the temperature and humidity control mechanism. Temperature and humidity control can be performed.

[Brief explanation of drawings]

FIG. 1 shows a first embodiment of the invention, FIG. 2 is an explanatory cross-sectional view taken along line nn in FIG. 1, FIG. 3 shows a second embodiment of the invention, and FIG. 3 is an explanatory diagram of the IV-■ line cross section, Figure 5 is a graph showing the relationship between absorbance and wavelength of reflected light, and Figure 6 is a graph showing the relationship between absorbance and wavelength of reflected light.
The figure shows a graph representing absorbance over time. ■-・Illumination detection section, 2-Spectroscopy section, 3-・Light detection section, 4.
-・Calculation measurement section, 5-・Output section. Patent applicant: UNITSUKU Co., Ltd.
Fuji Kosanyo Co., Ltd. Patent Attorney Mihiko Watanabe Figure 1 Figure 3

Claims (1)

[Claims] (1) An illumination detection unit that irradiates a predetermined area of the leaf tobacco with light emitted from a light source lamp and collects the reflected light; and a spectroscopy unit that separates the light collected by the illumination detection unit; A photodetector section that detects the intensity of a wavelength in a predetermined region of the light separated by the spectrometer and converts it into an electrical signal, and amplifies the target signal of the electrical signal from the photodetector section and performs necessary calculations. What is claimed is: 1. A leaf tobacco dryness detection device comprising: an arithmetic and measuring section that performs the following; and an output section that outputs the results calculated by the arithmetic and measuring section.