Photoelectric sensor for online characterization of tobacco leaf curing color

Abstract

The utility model relates to the technical field of tobacco leaf processing detection, specifically relates to a photoelectric sensor for the chroma online representation in the tobacco primary curing process, the utility model measurement is more stable, and the error caused by the uneven reflection of tobacco surface can be effectively eliminated by the integrating sphere structure, the detection is more accurate: the resolution of chroma analysis is improved by multiband photoelectric detection, the operation is more reliable: the protection and heat abstractor guarantee the long -term work of sensor under the primary curing environment, the maintenance is more convenient: the calibration device can be automatic calibration in time, reduces the manual maintenance, and the expansibility is strong: the signal processing device can be linked with the process control system, realizes the automatic regulation of the baking process.

Description

Technical Field

[0001] This utility model relates to the field of tobacco processing and testing technology, specifically to a photoelectric sensor for online characterization of color during the initial curing of tobacco leaves, belonging to the technical field of photoelectric detection and automated monitoring equipment for agricultural product processing. Background Technology

[0002] As a crucial raw material in the tobacco industry, the initial curing process of tobacco leaves directly impacts their final appearance and aroma. During this initial curing, color changes on the surface of the tobacco leaves are an important parameter reflecting the curing process.

[0003] Current colorimetric testing mainly relies on manual visual judgment, which has the following problems: strong subjectivity, with different workers having different judgment standards; low testing efficiency, requiring downtime for sampling; lack of quantitative basis, making it difficult to achieve automated control; and ordinary optical equipment is difficult to operate stably in high temperature and high humidity environments.

[0004] Therefore, a photoelectric sensor that can operate stably in the initial curing environment and has the ability to collect and quantify data in real time is needed to achieve continuous and objective monitoring of the color of tobacco leaves during initial curing. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a photoelectric sensor for online characterization of the initial curing color of tobacco leaves, comprising: the sensor including: a light source assembly, an integrating sphere light-collecting device, a filter array, a photoelectric sensor assembly, and a signal processing and control device; The light source assembly is installed above the detection cavity, and its light-emitting surface illuminates the surface of the tobacco leaf being tested. The detection cavity is used to hold the tobacco leaf being tested. The reflected light from the tobacco leaf being tested is collected by the integrating sphere light-collecting device and enters the filter array through the exit hole of the integrating sphere light-collecting device. The support for the filter array and photoelectric sensor assembly is installed at the outlet of the integrating sphere light-collecting device. The multiple filters of the filter array correspond to the photoelectric sensor assembly of different wavelength bands. The photoelectric signal is transmitted to the signal processing and control device through the amplification circuit.

[0006] Preferably, the sensor further includes a calibration device, which is installed on the side of the inlet of the integrating sphere light-collecting device.

[0007] Preferably, the calibration device is an electric rotating mechanism that drives a standard whiteboard to switch in the detection path.

[0008] Preferably, the sensor further includes a protection and heat dissipation device, which includes a metal housing, a heat insulation layer, and a ventilation channel.

[0009] Preferably, the signal processing and control device is disposed inside the protection and heat dissipation device and is connected to the filter array and photoelectric sensor assembly via a cable.

[0010] Preferably, the light-emitting surface of the light source assembly illuminates the surface of the tobacco leaf being tested through a diffuser.

[0011] Preferably, the light source assembly adopts a ring-shaped LED light strip structure with a detection channel in the center.

[0012] Preferably, the photoelectric sensor assembly is a packaged module structure.

[0013] The innovative aspects of the embodiments in this specification include: More stable measurements: The integrating sphere structure effectively eliminates errors caused by uneven reflection on the tobacco leaf surface; More accurate detection: Multi-band photoelectric detection improves the resolution of colorimetric analysis; More reliable operation: Protective and heat dissipation devices ensure that the sensor can work for a long time in the initial baking environment; More convenient maintenance: The calibration device can automatically calibrate at regular intervals, reducing manual maintenance; Strong scalability: The signal processing device can be linked with the process control system to realize automated adjustment of the baking process. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments or related technologies of this specification, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a photoelectric sensor for online characterization of the initial color of tobacco leaves after curing.

[0016] Reference numerals: 10, light source assembly; 20, integrating sphere light-collecting device; 30, filter array and photoelectric sensor assembly; 40, calibration device; 50, signal processing and control device; 60, protection and heat dissipation device. Detailed Implementation

[0017] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] It should be noted that the terms "comprising" and "having," and any variations thereof, in the embodiments and drawings of this specification are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0019] This specification discloses an online photoelectric sensor for characterizing the initial color of tobacco leaves after curing, which will be described in detail below. Example 1

[0020] like Figure 1 As shown, a photoelectric sensor for online characterization of the initial color of tobacco leaves includes: a light source assembly 10; an integrating sphere light-collecting device 20; a filter array and photoelectric sensor assembly 30; a calibration device 40; a signal processing and control device 50; and a protection and heat dissipation device 60.

[0021] The light source assembly 10 is installed above the detection cavity, and its light-emitting surface illuminates the surface of the tobacco leaf being tested through a diffuser. The reflected light from the tobacco leaf is collected by the integrating sphere light-collecting device 20, homogenized, and then enters the filter array and photoelectric sensor assembly 30 through the exit hole.

[0022] The filter array support is installed at the outlet of the integrating sphere. Multiple filters correspond to photoelectric sensors of different wavelengths. The photoelectric signals are transmitted to the signal processing and control device 50 through the amplification circuit.

[0023] The calibration device 40 is installed on one side of the integrating sphere inlet, specifically located at [location missing]. The electric rotating mechanism drives the standard white board to switch in the detection path to achieve periodic self-calibration of the system.

[0024] The signal processing and control device 50 is located inside the system housing and is connected to the sensor array via a cable for data processing and chromaticity parameter calculation.

[0025] The external protection and heat dissipation device 60 includes a metal shell, a heat insulation layer and a ventilation channel. It is fixed at the inspection window of the baking workshop and can operate stably for a long time in a high temperature and high humidity environment.

[0026] Through this structure, the present invention realizes real-time monitoring and quantitative analysis of tobacco leaf color. The detection process does not require manual intervention and can continuously output color signals, providing data support for the automatic control of tobacco leaf initial curing process.

[0027] Based on the above embodiments, the light source component adopts a ring-shaped LED light strip structure with a detection channel in the center to make the illumination light more uniform; the photoelectric sensor array adopts a packaged module design, which can be quickly replaced and maintained.

[0028] The light source assembly includes a high color rendering index LED light source, an optical diffuser, a light source support, and a power drive circuit. The LED light source is mounted on the support, and a diffuser is provided at the front end to obtain a uniform light field. The integrating sphere light-collecting device includes a sphere shell, an entrance aperture, an exit aperture, and a high reflectivity inner wall coating. The light reflected from the tobacco leaves enters the sphere cavity through the entrance aperture, undergoes multiple diffuse reflections on the inner wall, and exits through the exit aperture, achieving uniform light signal. The filter array and photoelectric sensor assembly includes a filter support, a multi-channel interference filter, and a photoelectric sensor array. The filter support is mounted at the front end of the exit aperture of the integrating sphere, and each filter corresponds to a photoelectric sensor for detecting light signals in different wavelength bands. The calibration device includes a standard white board, a support arm, an electric rotation mechanism, and a fixed base. The electric rotation mechanism drives the standard white board to switch in the detection path, realizing real-time calibration of the system sensitivity. The signal processing and control device includes an amplification circuit board, a data processing unit, and an output interface; it is used to receive photoelectric sensor signals and output colorimetric results. The protection and heat dissipation device includes a metal shell, a heat insulation layer, and a ventilation channel; the metal shell covers the main body of the system, and the internal air channel is set for forced heat dissipation to adapt to high temperature and high humidity environment.

[0029] In addition, the protection and heat dissipation devices have been enhanced with a temperature-controlled fan and a thermally conductive aluminum substrate, which further improves the overall heat dissipation performance of the structure, making it suitable for baking environments with higher temperatures.

[0030] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this utility model.

[0031] Those skilled in the art will understand that the modules in the apparatus of the embodiments can be distributed in the apparatus of the embodiments as described in the embodiments, or they can be located in one or more devices different from this embodiment with corresponding changes. The modules of the above embodiments can be combined into one module, or they can be further divided into multiple sub-modules.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A photoelectric sensor for online characterization of the initial color of tobacco leaves after curing, characterized in that, include: The sensor includes: a light source assembly, an integrating sphere light-collecting device, a filter array, a photoelectric sensor assembly, and a signal processing and control device; The light source assembly is installed above the detection cavity, and its light-emitting surface illuminates the surface of the tobacco leaf being tested. The detection cavity is used to hold the tobacco leaf being tested. The reflected light from the tobacco leaf being tested is collected by the integrating sphere light-collecting device and enters the filter array through the exit hole of the integrating sphere light-collecting device. The support for the filter array and photoelectric sensor assembly is installed at the outlet of the integrating sphere light-collecting device. The multiple filters of the filter array correspond to the photoelectric sensor assembly of different wavelength bands. The photoelectric signal is transmitted to the signal processing and control device through the amplification circuit.

2. The sensor according to claim 1, characterized in that, The sensor also includes a calibration device, which is installed on the side of the inlet of the integrating sphere light-collecting device.

3. The sensor according to claim 2, characterized in that, The calibration device specifically refers to an electric rotating mechanism that drives a standard whiteboard to switch within the detection path.

4. The sensor according to claim 1, characterized in that, The sensor also includes a protection and heat dissipation device, which includes a metal housing, a heat insulation layer, and a ventilation channel.

5. The sensor according to claim 4, characterized in that, The signal processing and control device is located inside the protection and heat dissipation device and is connected to the filter array and photoelectric sensor assembly via cables.

6. The sensor according to claim 1, characterized in that, The light-emitting surface of the light source assembly illuminates the surface of the tobacco leaf being tested through a diffuser.

7. The sensor according to claim 1, characterized in that, The light source assembly adopts a ring-shaped LED light strip structure with a detection channel in the center.

8. The sensor according to claim 1, characterized in that, The photoelectric sensor assembly is specifically a packaged module structure.

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