Fruit characteristic parameter measuring device and method

Abstract

This application relates to a fruit characteristic parameter measurement device and method. Among them, the measurement device includes a light emitter, a light receiver, and a measurement device; the light emitter includes an emission plate and a plurality of light-emitting diodes distributed on the emission plate, and the light-emitting diodes are used to emit a first detection light; the light receiver is used to receive a second detection light and output an optical signal; the second detection light is the reflected light that enters the light receiver after the first detection light is diffusely reflected by the pulp of the fruit to be measured; the measurement device is connected to the light-emitting diodes and the light receiver, and is used to obtain an optical intensity parameter according to the optical signal output by the light receiver, and obtain the characteristic parameter of the fruit to be measured according to the optical intensity parameter. By setting the emission plate and the plurality of light-emitting diodes distributed on the emission plate, the irradiation range of the first detection light emitted by the light emitter is increased, which is beneficial to increasing the effective measurement area of the fruit characteristic parameter measurement device and improving the accuracy of the measurement result.

Description

Technical Field

[0001] This application relates to the technology of determining fruit quality, and particularly to a device and method for measuring fruit characteristic parameters. Background Art

[0002] With the continuous improvement of living standards, people have higher and higher requirements for fruit quality. Fruit characteristics such as sweetness, acidity, and hardness are important indicators for judging fruit quality. Therefore, in fruit cultivation, targeted measures are usually taken to improve fruit quality, and after fruit picking, the characteristic parameters of fruits are also measured for grading and selling.

[0003] Traditional non-destructive measurement devices for fruit characteristic parameters use a single light source to irradiate the fruit to be measured, collect the light intensity signal reflected diffusely inside the fruit to be measured, and calculate the relationship between the light intensity and the fruit characteristic parameters to be measured, and then infer the characteristic parameters of the fruit to be measured. However, due to different actual growth conditions, such as uneven illumination, the characteristic parameters of different parts of the same fruit usually vary greatly. Therefore, traditional non-destructive measurement devices and methods for fruit characteristic parameters cannot truly reflect the characteristics of the entire fruit. Summary of the Invention

[0004] Based on this, it is necessary to provide a device and method for measuring fruit characteristic parameters to accurately measure the characteristic parameters of the entire fruit.

[0005] In a first aspect, an embodiment of the present application provides a device for measuring fruit characteristic parameters, which includes a light emitter, a light receiver, and a measuring device;

[0006] The light emitter includes an emission plate and a plurality of light-emitting diodes distributed on the emission plate, and the light-emitting diodes are used to emit a first detection light;

[0007] The light receiver is used to receive a second detection light and output a light signal; the second detection light is the reflected light that enters the light receiver after being diffusely reflected by the pulp of the fruit to be measured by the first detection light;

[0008] The measuring device is connected to the light-emitting diodes and the light receiver, and is used to obtain a light intensity parameter according to the light signal output by the light receiver, and obtain the characteristic parameters of the fruit to be measured according to the light intensity parameter.

[0009] In one of the embodiments, the light emitter includes at least two emission plates, and the emission plates are symmetrically distributed on both sides of the light receiver.

[0010] In one of the embodiments, the light emitter further includes a focusing lens; the focusing lens is arranged on the emission plate and is used to focus the characteristic light emitted by the light-emitting diodes and then enter the pulp of the fruit to be measured.

[0011] In one embodiment, the optical transmitter includes light-emitting diodes of at least two wavelengths; the optical receiver includes photodetectors having the same number as the number of wavelengths, and the photodetectors are connected to a measuring device.

[0012] In one embodiment, the number of light-emitting diodes of different wavelengths is the same and they are evenly distributed on the emission plate.

[0013] In one embodiment, the optical receiver further includes a beam splitter and a filter. The number of filters is the same as the number of photodetectors. The beam splitter, the filter, and the photodetectors are arranged in sequence. The beam splitter is used for splitting the second detected light; the filter is used for filtering the split second detected light to obtain third detected light; the third detected light includes a plurality of monochromatic light beams with different wavelengths; the photodetector is connected to the measuring device and is used for receiving the third detected light corresponding to the wavelength and outputting an electrical signal.

[0014] In one embodiment, the beam splitter is further used for changing the transmission direction of the split second detected light so that the split second detected light is perpendicularly incident on the filter.

[0015] In one embodiment, the measuring device includes a driving circuit, a signal acquisition circuit, and a controller. The driving circuit is connected to the light-emitting diode and is used for driving the light-emitting diode to emit the first detected light. The signal acquisition circuit is connected to the optical receiver and is used for processing the electrical signal output by the optical receiver to obtain a processed signal and sending it to the controller. The controller is connected to the driving circuit and the signal acquisition circuit, is used for sending a control instruction to the driving circuit, and is also used for analyzing the light intensity parameter of the signal processed by the signal acquisition circuit and calculating the characteristic parameter of the fruit to be measured according to the light intensity parameter.

[0016] In a second aspect, an embodiment of the present application provides a method for measuring fruit characteristic parameters, which is implemented based on the fruit characteristic parameter measuring device in the above embodiment. The method includes:

[0017] The optical transmitter emits the first detected light;

[0018] The optical receiver receives the second detected light and outputs an electrical signal;

[0019] The measuring device obtains the light intensity parameter according to the electrical signal and obtains the characteristic parameter of the fruit to be measured according to the light intensity parameter.

[0020] In one embodiment, the first detected light includes at least two wavelengths. The optical receiver receives the second detected light and outputs an electrical signal, including: processing the second detected light to obtain third detected light; the third detected light includes a plurality of monochromatic light beams with different wavelengths; receiving the third detected light corresponding to the wavelength and outputting an electrical signal.

[0021] The beneficial effects brought by the technical solutions provided in the embodiments of the present application at least include:

[0022] A transmitting plate and a plurality of light-emitting diodes distributed on the transmitting plate are arranged on the light emitter. The light-emitting diodes are used to emit the first detection light. Then, the light receiver is used to receive the second detection light that enters the light receiver after being diffusely reflected by the pulp of the fruit to be measured for the first detection light, and perform signal conversion on the second detection light to output an optical signal. Then, the measuring device processes the optical signal to obtain the light intensity parameter, and obtains the characteristic parameter of the fruit to be measured according to the light intensity parameter. In this way, the non-destructive measurement of the characteristic parameter of the fruit can be realized. At the same time, the transmitting plate and the plurality of light-emitting diodes distributed on the transmitting plate arranged on the light emitter increase the irradiation range of the first detection light emitted by the light emitter, which is beneficial to increasing the effective measurement area of the fruit characteristic parameter measuring device and improving the accuracy of the measurement result. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of a fruit characteristic parameter measuring device related to the embodiments of the present application;

[0024] Figure 2 It is a schematic diagram of a light emitter provided by the embodiments of the present application;

[0025] Figure 3 It is a schematic diagram of a light receiver provided by the embodiments of the present application;

[0026] Figure 4 It is a flowchart of a method for measuring fruit characteristic parameters provided by the embodiments of the present application;

[0027] Figure 5 It is a flowchart of another method for measuring fruit characteristic parameters provided by the embodiments of the present application.

[0028] Description of the reference numerals: 10 - fruit to be measured, 20 - light emitter, 30 - light receiver, 40 - measuring device, 21 - transmitting plate, 22 - light-emitting diode, 23 - connection point, 24 - focusing lens, 31 - diffusion plate, 32 - photodetector, 33 - photosensitive area, 221 - first infrared LED, 222 - second infrared LED, 223 - third infrared LED. Detailed Embodiments

[0029] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in the description of this application herein are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0031] It can be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0032] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or connected to the other element through an intermediate element. In addition, in the following embodiments, "connection", if there is a transmission of electrical signals or data between the connected objects, should be understood as "electrical connection", "communication connection", etc. Similarly, if there is a transmission of optical signals between the connected objects, it should be understood as "optical connection".

[0033] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprises / include" or "has" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the related listed items.

[0034] Please refer to Figure 1 , which shows a fruit characteristic parameter measuring device provided by an embodiment of this application. The device includes a light emitter 20, a light receiver 30 and a measuring device 40; the light emitter includes an emission board 21 and a plurality of light-emitting diodes distributed on the emission board 21, and the light-emitting diodes are used to emit a first detection light; the light receiver 30 is used to receive a second detection light and output an optical signal; the second detection light is the reflected light of the first detection light that enters the light receiver 30 after being diffusely reflected by the pulp of the fruit to be measured; the measuring device 30 is connected to the light-emitting diode 22 and the light receiver 30, and is used to obtain an optical intensity parameter according to the optical signal output by the light receiver 30, and obtain the characteristic parameter of the fruit to be measured according to the optical intensity parameter.

[0035] Among them, the fruit characteristic parameter refers to an index used to characterize the fruit quality. During the process of fruit cultivation, fruit farmers usually take targeted measures to improve the fruit quality. For example, they increase the fruit sweetness by adjusting the soil pH value, applying scientific fertilizers, and improving the lighting conditions. Correspondingly, after the fruit is picked, it is necessary to classify fruits of different qualities for grading and selling. Generally, the fruit characteristic parameters used as the fruit quality classification standard include size, shape, color, sweetness, acidity, hardness, etc. This embodiment does not limit the specific types of fruit characteristic parameters.

[0036] Specifically, the light emitter 20 can be fixed on the light receiver 30 through a support rod or fixed on a preset bracket. This embodiment does not limit the specific fixing method of the light emitter. A transmitting plate 21 is provided on the light emitter 20, and the transmitting plate 21 is used to fix the light-emitting diodes. Among them, the arrangement of the multiple light-emitting diodes on the transmitting plate can be an array distribution or a circular distribution. As Figure 2 shown, multiple light-emitting diodes 22 are circularly distributed on the transmitting plate 21. Further, the multiple light-emitting diodes can be evenly distributed on the transmitting plate so that the first detection light emitted by the light-emitting diodes 22 irradiates the fruit to be measured more evenly. The light-emitting diode 22 can be an LED (light-emitting diode), an OLED (organic light-emitting diode), or a halogen lamp, as well as other known forms of light-emitting light sources. The shape of the light-emitting diode 22 can be square or circular. This embodiment does not limit the shape and type of the light-emitting diode.

[0037] In addition, a support device can be provided on the light emitter 20 and the light receiver 30 to form a fulcrum for supporting the fruit to be measured 10, so that the fruit to be measured 10 can be stably placed on the fruit characteristic parameter measuring device. The support device can be a flat plate or a suction cup. This application does not limit the specific shape and material of the support device. For example, the transmitting plate 21 can be set to an arc shape to better support the fruit to be measured 10. At the same time, it can also make the light-emitting diodes 22 on the transmitting plate 21 closer to the surface of the fruit to be measured 10, improving the utilization rate of the first detection light emitted from the light-emitting diode 21. In addition, the transmitting plate 21 can be made of a flexible material and folded and deformed according to the shape of the fruit to be measured 10 during use, so that the transmitting plate 21 can better fit the surface of the fruit to be measured 10. As Figure 1 shown, the thickness of the light emitter 20 is 1.6 mm. As Figure 2 shown, the transmitting plate 21 is a disc with a radius of 10 mm, and the light-emitting diode 22 is a square light-emitting diode with a width of 3.5 mm and a length of 2.8 mm.

[0038] The first detection light emitted by the light-emitting diode 22 enters the pulp of the fruit 10 to be measured and undergoes diffuse reflection. A part of the light enters the light receiver 30 after diffuse reflection, and this part of the reflected light received by the light receiver 30 is the second detection light. It can be understood that the first detection light is not a single light beam, but a general term for the characteristic light emitted by multiple light-emitting diodes. Similarly, the second detection light is not a single light beam, but a general term for the reflected light that enters the light receiver after diffuse reflection. Specifically, the light receiver 30 may include one or more photodetectors for receiving the second detection light and converting the second detection light into an electrical signal. For example, when the first detection light only contains a light beam of one wavelength, only one photodetector may be set; when the first detection light contains light beams of two or more wavelengths, multiple photodetectors may be correspondingly set to detect the reflected light of the corresponding wavelengths respectively. In addition, a diffuser plate 31 may be provided on the light receiver 30. The diffuser plate 31 is made of a light-transmitting material and can transmit the reflected light that reaches the diffuser plate 31 after diffuse reflection by the pulp of the fruit to be measured. The diffuser plate 31 is also used to support the fruit 10 to be measured. Further, a condenser lens may be provided before the reflected light enters the photodetector to focus it, so that more reflected light enters the photosensitive surface of the photodetector and increases the light signal intensity.

[0039] The second detection light is received by the light receiver 30 and an electrical signal is output. After the electrical signal enters the measuring device 40, the measuring device 40 analyzes and calculates the electrical signal, inversely deduces the light intensity parameter, and then obtains the characteristic parameter of the fruit 10 to be measured according to the light intensity parameter and the preset calculation model. It can be understood that since the fruit 10 to be measured and the characteristic parameter to be measured are different, the wavelength of the first detection light emitted by the light emitter 20 and the preset calculation model in the measuring device 40 will be different. Specifically, a spectrometer can be used to collect the diffuse reflection spectrum of the fruit to be measured, perform a correlation analysis on the diffuse reflection spectrum and the measured characteristic parameter to obtain the corresponding characteristic wavelength, establish a preset model, then set the light-emitting diode 22 of the corresponding wavelength on the light emitter 20, set the photodetector of the corresponding wavelength on the light receiver 30, and input the preset model into the measuring device 40.

[0040] Further, light-emitting diodes 22 of multiple wavelengths can be arranged on the optical transmitter 20, and a drive circuit can be arranged in the measuring device 40. The drive circuit drives the light-emitting diode 22 of a specific wavelength to emit the first detection light of the corresponding wavelength. For example, when the characteristic parameter to be measured is the sugar content of an apple, the near-infrared diffuse reflection spectrum of the apple can be collected by a micro fiber optic spectrometer, and the correlation analysis is performed on the spectrum and the actual sugar content of the apple, so as to obtain the near-infrared characteristic wavelength corresponding to the apple sugar content analysis and the calculation model of the diffuse reflection light intensity and the sugar content. In this way, the infrared LED of this characteristic wavelength can be selected to irradiate the apple surface to emit the first detection light. The first detection light is diffusely reflected by the apple pulp and then detected by the photodetector of the corresponding wavelength in the optical receiver, converted into an electrical signal and then sent to the measuring device. The measuring device then analyzes the electrical signal, inversely deduces the diffuse reflection light intensity parameter, and according to this light intensity parameter and the calculation model obtained by the correlation analysis, the apple sugar content can be calculated.

[0041] Furthermore, after the measuring device obtains the fruit characteristic parameter, it will output the information containing the measurement result. Specifically, the content of the prompt information can be text information, or it can be light or sound information. The measuring device can send the prompt information to the signal lamp and / or the buzzer, and the signal lamp and / or the buzzer generate signals to prompt the measurement result. For example, when the signal is light, lights of different colors can be set to identify fruits of different qualities. The measuring device can also send the prompt information to the display, and the display displays the prompt information, so that the user can flexibly set the threshold according to the measurement result for fruit quality classification. The measuring device can send the prompt information to the terminal, and the terminal can be a mobile terminal such as a mobile phone or a tablet, or it can be a host computer. This embodiment does not limit the way of outputting the prompt information by the measuring device and the specific content of the prompt information. Optionally, a display device can be arranged on the measuring device to display the measurement result, so that the user can flexibly set the threshold according to the measurement result for fruit quality classification.

[0042] In addition, a power supply device can be arranged on the measuring device. The power supply device is connected to the relevant devices in the measuring device and is used to provide power. The power supply device can be a plug for connecting to an external power supply, or it can be a built-in battery with an energy storage function. This embodiment does not limit the specific form of the power supply device.

[0043] In the above embodiments, an emission plate and a plurality of light-emitting diodes distributed on the emission plate are provided on the light emitter. The light-emitting diodes emit first detection light. Then, a light receiver is used to receive the second detection light that enters the light receiver after being diffusely reflected by the pulp of the fruit to be measured from the first detection light, and perform signal conversion on the second detection light to output an electrical signal. Then, the electrical signal is processed by a measuring device to obtain a light intensity parameter, and the characteristic parameter of the fruit to be measured is obtained based on the light intensity parameter. In this way, non-destructive measurement of the characteristic parameters of the fruit can be achieved. At the same time, the emission plate and the plurality of light-emitting diodes distributed on the emission plate provided on the light emitter increase the irradiation range of the first detection light emitted by the light emitter, which is beneficial to increasing the effective measurement area of the fruit characteristic parameter measuring device and improving the accuracy of the measurement result.

[0044] In one embodiment, the light emitter 20 includes at least two emission plates 21, and the emission plates 21 are symmetrically distributed on both sides of the light receiver 30.

[0045] Specifically, please continue to refer to Figure 1 , the two emission plates can be symmetrically arranged on both sides of the light receiver 30, and the side of the emission plate close to the light receiver 30 is connected to the light receiver 30. Further, the connection between the emission plate and the light receiver 30 is a movable connection, and the emission plate can rotate around the connection point 23. When not measuring, the two emission plates are respectively rotated clockwise or counterclockwise around the corresponding connection points 23 to make the emission plates in a retracted state, which is convenient for storage; when measuring, according to the size of the fruit to be measured, the emission plates are opened to a certain angle. On the one hand, it is convenient to support the fruit to be measured 10, and on the other hand, it can also make the light-emitting diodes on the emission plate better fit the fruit to be measured 10, evenly irradiate the fruit to be measured 10, and improve the utilization rate of the first detection light. As Figure 1 In, the opening angle of the two emission plates is 130°. It can be understood that more than two emission plates can also be set according to the actual situation, and only the emission plates need to be symmetrically arranged on both sides of the receiver. The specific number of the emission plates in this embodiment is not limited.

[0046] In the above embodiments, by providing symmetrically distributed emission plates on both sides of the light receiver, on the one hand, it is convenient to provide support for the fruit to be measured, and on the other hand, it can also make the light-emitting diodes better fit the fruit to be measured, make the first detection light more evenly irradiate the surface of the fruit to be measured, which is beneficial to improving the utilization rate of the first detection light, increasing the effective measurement area of the fruit characteristic parameter measuring device, and improving the accuracy of the measurement result.

[0047] In one embodiment, please continue to refer to Figure 1 , the light emitter 20 further includes a focusing lens 24, and the focusing lens 24 is disposed on the emission plate and is used to focus the characteristic light emitted by the light-emitting diodes on the emission plate and then enter the pulp of the fruit to be measured.

[0048] Among them, the focusing lens 24 can be a focusing lens or a reflective lens. When the focusing lens is a focusing lens, the focusing lens 24 is arranged between the light-emitting tube and the fruit to be measured 10, and the characteristic light emitted by the light-emitting tube passes through the focusing lens 24 and is focused on the fruit to be measured 10; when the focusing lens is a reflective lens, the focusing lens 24 is arranged between the light-emitting tube and the emission plate, and the characteristic light emitted by the light-emitting tube 22 is reflected by the focusing lens 24 and then focused on the fruit to be measured 10.

[0049] Specifically, the focusing lens 24 corresponds to the light-emitting tube 22 one by one. Each focusing lens 24 focuses the characteristic light emitted by its corresponding light-emitting tube 22, and the focused characteristic light forms the first detection light and enters the pulp of the fruit to be measured. As Figure 2 shown, when the light-emitting tubes 22 are annularly distributed on the emission plate 21, an annular condenser lens can be set so that the characteristic light emitted by the light-emitting tubes 22 is focused to form the first detection light. Further, by adjusting the position and angle of the focusing lens so that its focus is located in the area within the peel of the fruit to be measured, the first detection light formed after focusing can directly enter the pulp of the fruit to be measured, improving the light intensity and utilization rate of the first detection light, enhancing the sensitivity of the measuring device, and improving the accuracy of the measurement result.

[0050] In the above embodiment, by setting the focusing lens to focus the characteristic light emitted by the light-emitting tube, the energy of the first detection light formed after focusing is more concentrated, which is beneficial to improving the light intensity and utilization rate of the first detection light, enhancing the sensitivity of the measuring device, and improving the accuracy of the measurement result.

[0051] In one embodiment, the light emitter includes light-emitting tubes of at least two wavelengths, and the light receiver includes light detectors having the same number of wavelengths as the number of wavelengths, and the light detectors are connected to the measuring device.

[0052] Specifically, as described above, when performing spectral analysis of fruit characteristic parameters, corresponding characteristic wavelengths are generally obtained. Usually, this characteristic wavelength is not only related to the fruit variety, but also related to characteristics such as fruit hardness and density. Therefore, for the same kind of fruit, this characteristic wavelength is not a unique value, but a characteristic wavelength range. For example, the characteristic wavelengths corresponding to the sugar content of apples with different hardnesses are different, but they are all within the characteristic wavelength range of 880 nm - 1050 nm corresponding to the sugar content of apples.

[0053] Select multiple wavelengths within this characteristic wavelength range, set the light-emitting diodes corresponding to these wavelengths to emit the first detection light, and set the photodetectors corresponding to these wavelengths in the optical receiver, then the third detection light containing multiple wavelengths can be received. Among them, the selected multiple wavelengths are evenly distributed within the characteristic wavelength range. For example, when the characteristic wavelength range is 880nm - 1050nm, the 5 selected wavelengths are 880nm, 900nm, 940nm, 970nm, and 1050nm respectively, which can make the measurement range wider. It can be understood that the third detection light is not a single light beam, but a general term for the reflected light that enters the photodetector after diffuse reflection. For example, when 5 types of light-emitting diodes with different wavelengths are set on the emission plate to emit the first detection light containing 5 wavelengths, as Figure 3 shown, it is necessary to set 5 photodetectors 32 corresponding to these 5 wavelengths on the optical receiver to collect the third detection light.

[0054] The optical collector converts the optical signal of the collected third detection light into an electrical signal and transmits it to the measuring device. The measuring device then calculates according to a preset formula, and the information of the characteristic parameters corresponding to the fruit can be obtained. The light intensity parameters of the light beams with different wavelengths in the third detection light can be substituted into the preset model for calculation in a weighted average manner to obtain the characteristic parameters of the measured fruit. A correction term can also be introduced into the preset model to improve the accuracy of the measurement result of the fruit characteristic parameters.

[0055] Furthermore, multiple types of light-emitting diodes 22 with different wavelengths can be set on the transmitter 20, and a driving circuit can be set in the measuring device 40 to drive the light-emitting diodes with different wavelengths to emit light, and the corresponding relationships between the fruit types, characteristic parameters, characteristic wavelengths, and preset models are stored in the storage module of the measuring device 40. When measuring the fruit characteristic parameters, the user only needs to select the corresponding fruit type and characteristic parameters, and the driving circuit will drive the light-emitting diodes with the corresponding wavelengths to emit the first detection light, and the measuring device 40 will calculate the characteristic parameters according to the corresponding preset model. In this way, the measurement of multiple characteristic parameters of multiple fruits can be realized on the same measuring device. In addition, a function selection device can also be set on the measuring device to facilitate the user to select the fruit type and characteristic parameters to be measured. This function selection device can include an operable touch screen display interface, or can include a display interface and selection buttons, or can also be a remote control. The specific form of the function selection device in this embodiment is not limited.

[0056] In the above embodiment, by setting at least two types of light-emitting diodes with different wavelengths on the transmitter and setting the photodetectors with corresponding wavelengths on the optical receiver, the third detection light containing multiple wavelengths can be received, so that the light intensity information of more wavelengths can be collected, which is beneficial to improving the accuracy of the measurement result of the fruit characteristic parameters. In addition, the setting of multiple types of light-emitting diodes is also beneficial to improving the flexibility of the application scenarios of the fruit characteristic parameter measuring device.

[0057] In one embodiment, the number of light-emitting diodes with different wavelengths is the same and they are evenly distributed.

[0058] Specifically, evenly distributing the light-emitting diodes with different wavelengths can be achieved by arranging the light-emitting diodes with different wavelengths at intervals in an array or circular pattern. Taking the circular distribution as an example, the light-emitting diodes of each wavelength can be arranged at the same interval, or the light-emitting diodes with different wavelengths can be arranged in sequence. Taking the measurement of apple sugar content as an example, within the wavelength range of 880 nm - 1050 nm, five wavelengths of 880 nm, 900 nm, 940 nm, 970 nm, and 1050 nm are selected, and infrared LEDs corresponding to these five wavelengths are set on the light emitter, as Figure 2 shown, a total of 15 infrared LEDs are set on the emission plate 21, among which there are 3 infrared LEDs of each wavelength and they are evenly distributed. For example Figure 2 in, the first infrared LED 221, the second infrared LED 222, and the third infrared LED 223 are all infrared LEDs with a wavelength of 970 nm. It should be noted that in this embodiment, the type and specific arrangement of the light-emitting diodes are not limited, as long as the number of light-emitting diodes with different wavelengths is set to be the same and they are evenly distributed on the emission plate.

[0059] In the above embodiment, by setting the light-emitting diodes corresponding to the same number and evenly distributed wavelengths on the emission plate, the characteristic lights with different wavelengths emitted by the light-emitting diodes are evenly irradiated on the measured fruit, increasing the irradiation range of the characteristic lights with different wavelengths, which is beneficial to increasing the effective measurement area of the fruit characteristic parameter measurement device and improving the accuracy of the measurement result.

[0060] In one embodiment, the optical receiver includes a beam splitter, a filter, and a photodetector connected in sequence; the beam splitter is used for splitting the second detection light; the filter is used for filtering the second detection light after splitting to obtain the third detection light; the third detection light includes a plurality of monochromatic light beams with different wavelengths; the photodetector is connected to the measurement device and is used for receiving the third detection light corresponding to the wavelength and outputting an electrical signal.

[0061] Among them, the beam splitter includes a plurality of beam splitters and a beam transmission device, which is used for splitting the collected second detection light. For example, when using the first detection light of five wavelengths to measure the apple sugar content, the collected second detection light needs to be split into five beams, as Figure 3As shown in the figure, the light-sensitive areas 33 corresponding to five light detectors 32 are incident. In order to improve the signal-to-noise ratio of the optical signals collected by the light detectors, after the second detection light is split, a filter is also provided to filter the split second detection light to obtain the third detection light. In this way, the third detection light reaching the light-sensitive area of the light detector is a monochromatic light beam of the corresponding wavelength.

[0062] As Figure 1 shown in the figure, the beam splitter can be arranged between the diffusion plate 31 and the light detector 32, and a housing is provided for protection and dust prevention. Further, by setting the angle and position of the beam splitter, the second detection light after passing through the beam splitter can be vertically incident on the filter, and then the filter is arranged in parallel with the light detector, so that the third detection light is vertically incident on the light detector. In this way, the utilization rate of the second detection light can be improved, and the sensitivity and accuracy of the measurement can be enhanced.

[0063] In the above embodiment, by arranging a beam splitter and a filter connected in series in the optical receiver, the third detection light in the light-sensitive area of the detector is a monochromatic light beam of the corresponding wavelength, which is beneficial to improving the signal-to-noise ratio of the optical signals collected by the light detector and enhancing the sensitivity and accuracy of the measurement.

[0064] In one embodiment, the measuring device includes a driving circuit, a signal acquisition circuit and a controller; the driving circuit is connected to the light-emitting diode and is used to drive the light-emitting diode to emit the first detection light; the signal acquisition circuit is connected to the optical receiver and is used to process the electrical signal output by the optical receiver to obtain a processed signal and send it to the controller; the controller is connected to the driving circuit and the signal acquisition circuit, is used to send a control instruction to the driving circuit, and is also used to analyze the light intensity parameter of the signal processed by the signal acquisition circuit and calculate the characteristic parameter of the measured fruit according to the light intensity parameter.

[0065] Among them, the driving circuit can be arranged on the emitting plate or at the bottom of the optical receiver, and is connected to the light-emitting diode on the emitting plate through a lead to control the opening and closing of the light-emitting diode on the emitting plate. For example, a PCB (printed circuit board) of the driving circuit can be arranged on the emitting plate, and then the light-emitting diode is fixed on the PCB. Specifically, the controller can send a control instruction to the driving circuit to selectively turn on or off the light-emitting diodes of specific wavelengths, and can also selectively turn on or off the light-emitting diodes at certain specific positions. Further, the driving circuit is a DAC (digital-to-analog conversion) driving circuit.

[0066] The optical receiver sends an electrical signal to the signal acquisition circuit. After processing the received electrical signal, the signal acquisition circuit sends the processed signal to the controller via a serial data bus. Among them, the acquisition circuit is an ADC (analog-to-digital conversion) acquisition circuit. Optionally, when the electrical signal output by the optical receiver is weak, the electrical signal can be amplified and then sent to the signal acquisition circuit for signal acquisition, which is beneficial to improving the signal-to-noise ratio and enhancing the resolution of the measuring device.

[0067] The controller receives the signal sent by the signal acquisition circuit, and inversely infers the light intensity parameter of the second detection light through this signal, and calculates the characteristic parameter of the measured fruit according to this light intensity parameter and a preset model. Specifically, a spectrometer can be used to collect the diffuse reflection spectrum of the measured fruit, perform a correlation analysis on the diffuse reflection spectrum and the measured characteristic parameter to obtain the corresponding characteristic wavelength, and establish a preset model. The preset model is different corresponding to different fruit types and characteristic parameter types. In addition, a correction term can be introduced into the preset model to improve the accuracy of the measurement result of the fruit characteristic parameter. The correction term can be an error coefficient, which is obtained from multiple repeated measurements of a certain characteristic parameter of the same fruit.

[0068] In the above embodiment, by setting the controller to send an instruction to the drive circuit to control the opening and closing of the light-emitting diodes, different light-emitting diodes can be turned on or off according to the types of the measured fruit and characteristic parameters, which is beneficial to improving the flexibility of the application scenario of the fruit characteristic parameter measuring device; by analyzing and processing the second detection light signal through the signal acquisition circuit and sending the processed signal to the controller, the controller analyzes and obtains the light intensity parameter, and calculates the characteristic parameter of the measured fruit according to this light intensity parameter and a preset model, which can improve the analysis and calculation ability of the measuring device, and thus improve the measurement efficiency and the accuracy of the measurement result.

[0069] Please refer to Figure 4 , the embodiment of the present application provides a method for measuring fruit characteristic parameters, which is implemented based on the fruit characteristic parameter measuring device in the above embodiment. The method includes:

[0070] Step S410: The optical transmitter emits the first detection light.

[0071] Specifically, the optical transmitter is provided with a transmitting plate and a plurality of light-emitting diodes distributed on the transmitting plate. The light-emitting diodes are used to emit the first detection light. As described above, the first detection light is not a single light beam, but a collective term for the characteristic lights emitted by a plurality of light-emitting diodes.

[0072] Step S420: The optical receiver receives the second detection light and outputs an electrical signal.

[0073] The first detection light emitted by the light-emitting diode enters the pulp of the fruit to be measured and undergoes diffuse reflection. A part of the light enters the light receiver after diffuse reflection, and this part of the reflected light received by the light receiver is the second detection light. After the light receiver receives the second detection light, it converts the second detection light into an electrical signal and outputs the electrical signal to the measuring device. As described above, the second detection light is not a single light beam either, but a general term for the reflected light that enters the light receiver after diffuse reflection.

[0074] Step S430: The measuring device obtains the light intensity parameter based on the electrical signal, and obtains the characteristic parameter of the fruit to be measured based on the light intensity parameter.

[0075] The measuring device analyzes and calculates the electrical signal sent by the light receiver, inversely deduces the light intensity parameter, and then obtains the characteristic parameter of the fruit to be measured based on the light intensity parameter and the preset calculation model. It can be understood that since the fruit to be measured and the characteristic parameter to be measured are different, the wavelength of the first detection light emitted by the light emitter and the preset calculation model in the measuring device will be different. Specifically, a spectrometer can be used to collect the diffuse reflection spectrum of the fruit to be measured, perform a correlation analysis on the diffuse reflection spectrum and the measured characteristic parameter to obtain the corresponding characteristic wavelength, establish a preset model, then set a light-emitting diode with the corresponding wavelength on the light emitter, set a light detector with the corresponding wavelength on the light receiver, and input the preset model into the measuring device.

[0076] In addition, after step S430, the method may further include the step of outputting a prompt message according to the characteristic parameter of the fruit to be measured. Specifically, the content of the prompt message can be text information, or it can be light or sound information. The measuring device can send the prompt message to the signal lamp and / or the buzzer, and the signal lamp and / or the buzzer generate signals to prompt the measurement result. For example, when the signal is light, different colors of lights can be set to identify fruits of different qualities. The measuring device can also send the prompt message to the display, and the display prompts the message, so that the user can flexibly set the threshold for fruit quality classification according to the measurement result. The measuring device can send the prompt message to the terminal, and the terminal can be a mobile terminal such as a mobile phone or a tablet, or it can be a host computer. This embodiment does not limit the way of outputting the prompt message by the measuring device and the specific content of the prompt message.

[0077] In the above embodiments, a first detection light is emitted by a light emitter. Then, a light receiver is used to receive a second detection light that enters the light receiver after being diffusely reflected by the pulp of the fruit to be measured, and the second detection light is subjected to signal conversion to output an electrical signal. Then, a measuring device processes the electrical signal to obtain a light intensity parameter, and based on this light intensity parameter, a characteristic parameter of the fruit to be measured is obtained. In this way, non-destructive measurement of the characteristic parameters of the fruit can be achieved. At the same time, the emission plate and multiple light-emitting diodes distributed on the emission plate provided on the light emitter increase the irradiation range of the first detection light emitted by the light emitter, which is beneficial to increasing the effective measurement area of the fruit characteristic parameter measurement device and improving the accuracy of the measurement result.

[0078] In one of the embodiments, please refer to Figure 5 , in step 410, the first detection light emitted by the light emitter includes at least two wavelengths. Correspondingly, step 420 includes steps 421 and 422.

[0079] Step 421: The light receiver processes the second detection light to obtain a third detection light; the third detection light includes multiple monochromatic light beams with different wavelengths.

[0080] Specifically, the light receiver may include a spectroscope and a filter connected thereto. The spectroscope may include multiple spectroscopes and a beam transmission device for spectroscopically processing the collected second detection light. After spectroscopically processing the second detection light, a filter may also be provided to perform filtering processing on the spectroscopically processed second detection light. In this way, the third detection light reaching the photosensitive area of the photodetector is a monochromatic light beam corresponding to the wavelength.

[0081] Step 422: The light receiver receives the third detection light corresponding to the wavelength and outputs an electrical signal.

[0082] Specifically, a photodetector parallel to the filter may be provided to receive the third detection light and convert the light signal into an electrical signal and output it to the measuring device. As described above, the third detection light is not a single light beam, but a general term for the reflected light that enters the photodetector after being diffusely reflected.

[0083] In the above embodiments, by providing a spectroscope and a filter connected in series in the light receiver, the third detection light in the photosensitive area of the detector is a monochromatic light beam corresponding to the wavelength, which is beneficial to improving the signal-to-noise ratio of the light signal collected by the photodetector and improving the sensitivity and accuracy of the measurement.

[0084] It should be understood that although Figures 4 - 5 the steps in the flowchart are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover,Figures 4 - 5 At least some of the steps may include multiple steps or multiple stages, and these steps or stages do not necessarily need to be executed and completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in turns with at least some of the steps or stages in other steps or other steps.

[0085] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0086] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A fruit characteristic parameter measurement device, characterized in that, It includes an optical transmitter, an optical receiver, and a measuring device; The optical transmitter includes a transmitting plate and a plurality of light-emitting diodes distributed on the transmitting plate; the optical transmitter includes light-emitting diodes of at least two wavelengths; a part of each of the light-emitting diodes is used to emit a first detection light; the wavelength of the first detection light is evenly distributed within a characteristic wavelength range, and the characteristic wavelength range is determined according to the type of the fruit to be measured and the characteristic parameter expected to be measured for the fruit to be measured; the transmitting plate is made of a flexible material, and during use, the transmitting plate folds and deforms according to the shape of the fruit to be measured to fit the surface of the fruit to be measured; The optical transmitter further includes focusing lenses; the focusing lenses are arranged on the transmitting plate, and each focusing lens corresponds to a light-emitting diode. By adjusting the position and angle of each focusing lens, each focusing lens focuses the characteristic light emitted by the corresponding light-emitting diode respectively, and the focused characteristic light constitutes the first detection light and enters the pulp of the fruit to be measured; the focusing lens is a focusing lens or a reflective lens; the focusing lens is arranged between the light-emitting diode and the fruit to be measured; the reflective lens is arranged between the light-emitting diode and the transmitting plate; The optical receiver is used to receive a second detection light and output an electrical signal; the second detection light is the reflected light of the first detection light that enters the optical receiver after being diffusely reflected by the pulp of the fruit to be measured; The optical receiver includes the same number of photodetectors as the number of wavelengths, and each photodetector is respectively used to detect the reflected light of the corresponding wavelength; The measuring device is connected to the light-emitting diodes and the photodetectors, and is used to obtain the light intensity parameters of different wavelength beams according to the electrical signal, and substitute each of the light intensity parameters into a preset model in a weighted average manner for calculation to obtain the characteristic parameter of the fruit to be measured.

2. The fruit characteristic parameter measuring device according to claim 1, wherein The optical transmitter includes at least two transmitting plates, and the transmitting plates are symmetrically distributed on both sides of the optical receiver.

3. The fruit characteristic parameter measuring device according to claim 1, characterized in that, A diffusing plate is arranged on the optical receiver; the diffusing plate is made of a light-transmitting material.

4. The fruit characteristic parameter measuring device according to claim 1, characterized in that, The number of light-emitting diodes of different wavelengths is the same, and they are evenly distributed on the transmitting plate.

5. The fruit characteristic parameter measuring device according to claim 1, wherein The optical receiver further includes a beam splitter and a filter, the number of filters is the same as the number of photodetectors, and the beam splitter, the filter, and the photodetector are arranged in sequence; The beam splitter is used to perform beam splitting on the second detection light; The filter is used to perform filtering on the second detection light after beam splitting to obtain a third detection light; the third detection light includes a plurality of monochromatic beams with different wavelengths; The photodetector is connected to the measuring device and is used to receive the third detection light of the corresponding wavelength and output an electrical signal.

6. The fruit characteristic parameter measuring device according to claim 5, wherein, The beam splitter is further used to change the transmission direction of the second detection light after beam splitting, so that the second detection light after beam splitting is perpendicularly incident on the filter.

7. The fruit characteristic parameter measuring device according to claim 1, wherein The measuring device includes a driving circuit, a signal acquisition circuit, and a controller; The driving circuit is connected to the light-emitting diodes and is used to drive the light-emitting diodes to emit the first detection light; The signal acquisition circuit is connected to the optical receiver and is used to process the electrical signal output by the optical receiver to obtain a processed signal and send it to the controller; The controller is connected to the drive circuit and the signal acquisition circuit, and is configured to send control instructions to the drive circuit, and is further configured to analyze the light intensity parameter of the signal processed by the signal acquisition circuit, and calculate the characteristic parameter of the fruit to be measured according to the light intensity parameter.

8. A method for measuring fruit characteristic parameters, characterized in that Implemented based on the fruit characteristic parameter measurement device according to any one of claims 1-7, the method includes: The light emitter emits a first detection light; a part of each of the light emitting diodes is used to emit the first detection light; the wavelength of the first detection light is evenly distributed within a characteristic wavelength range, and the characteristic wavelength range is determined according to the type of the fruit to be measured and the characteristic parameter to be measured of the fruit to be measured; the emission plate is made of a flexible material, and when in use, the emission plate is folded and deformed according to the shape of the fruit to be measured to fit the surface of the fruit to be measured; the light emitter further includes a focusing lens; the focusing lens is disposed on the emission plate, and the focusing lens corresponds to the light emitting diode one by one, and each focusing lens focuses the characteristic light emitted by the corresponding light emitting diode, and the focused characteristic light constitutes the first detection light and enters the pulp of the fruit to be measured; the focusing lens is a focusing lens or a reflective lens; the focusing lens is disposed between the light emitting diode and the fruit to be measured; the reflective lens is disposed between the light emitting diode and the emission plate; The light receiver receives the second detection light and outputs an optical signal; the second detection light is the reflected light of the first detection light that enters the light receiver after being diffusely reflected by the pulp of the fruit to be measured; the light receiver includes a light detector having the same number of wavelengths as the first detection light, and each light detector is respectively configured to detect the reflected light of the corresponding wavelength. The measuring device obtains the light intensity parameter of each beam of different wavelengths according to the optical signal, and substitutes each light intensity parameter into a preset model in a weighted average manner for calculation to obtain the characteristic parameter of the fruit to be measured.

9. The method for measuring fruit characteristic parameters according to claim 8, wherein, The light receiver receives the second detection light and outputs an optical signal, including: Processing the second detection light to obtain a third detection light; the third detection light includes a plurality of monochromatic beams with different wavelengths; Receiving the third detection light of the corresponding wavelength and outputting an optical signal.

10. The method for measuring fruit characteristic parameters according to claim 8, wherein The method further includes: Outputting a corresponding prompt message according to the characteristic parameter of the fruit to be measured.

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