CN103487400A - Near infrared household food detection device and method - Google Patents

Near infrared household food detection device and method Download PDF

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Publication number
CN103487400A
CN103487400A CN201310480036.XA CN201310480036A CN103487400A CN 103487400 A CN103487400 A CN 103487400A CN 201310480036 A CN201310480036 A CN 201310480036A CN 103487400 A CN103487400 A CN 103487400A
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CN
China
Prior art keywords
near infrared
light emitting
detecting device
optical filter
wavelength
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Pending
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CN201310480036.XA
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Chinese (zh)
Inventor
赵春城
赵烟桥
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Wuxi Xresearch Product Design and Research Co Ltd
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Wuxi Xresearch Product Design and Research Co Ltd
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Priority to CN201310480036.XA priority Critical patent/CN103487400A/en
Publication of CN103487400A publication Critical patent/CN103487400A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/359Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light

Abstract

The invention discloses a near infrared household food detection device and method, and belongs to a food detection device and method by utilizing optical absorption characteristics of organic ingredients of food in a near infrared spectrum area. According to the device, near infrared rays emitted by a near infrared light emitting diode are collimated and emitted in parallel through a collimator objective and are converged to a detector through a focusing lens; a sample rack is arranged above a middle position between an optical filter and the detector; the detector is provided with an interface connected with a computer. The method comprises the following steps: adjusting the position of the near infrared light emitting diode, so that the emitted near infrared rays are received by the detector; suspending a sample to be detected on the sample rack; arranging the optical filter, so as to obtain a detection result of the sample to be detected under a particular wavelength; finally, analyzing the detection result according to the conventional technology, so as to obtain a detection conclusion. A filtering effect is improved, the device has a detection function under different wavelengths, and the influence of a container loading the sample to be detected on a measurement result is avoided. In addition, the device has high upgradeability and high extensibility.

Description

Near infrared ray domestic food pick-up unit and method
Technical field
Near infrared ray domestic food pick-up unit and method belong to utilizes food inspection device and the detection method of food organic principle at the optical absorption characteristic near infrared spectrum zone.
Background technology
Near-infrared detection device for food quality is the difference in the strongest absorbing wavelength of the optical absorption characteristic near infrared spectrum zone, each composition according to various representational organic components in meat, edible wet goods food, and the proportional relation between absorption intensity and grain organic content, by to the known chemical analysis content of sample and the regretional analysis as a result of its near infrared ray, set up calibration equation, can be estimated the unknown sample component content of same similar type.A little less than near-infrared absorption, in comparing, infrared and visible light wave range has stronger penetration capacity, therefore not only can see through thicker sample, realizes long light path mensuration, and without dilute sample, get final product the principal ingredient of direct working sample.
Early stage near infrared spectrum detects and is applied to agricultural byproducts, mostly by the diffuse reflection technology, realizes.The signal intensity that the diffuse reflection method is enough because needs have, and need to effectively collect scattered light, therefore there is the shortcoming of light channel structure complexity.This shortcoming has also just limited this food inspection device and mostly has been bench device, and is mainly used in the departments of collective such as office, enterprises and institutions, school.
Along with scientific and technological fast development, the continuous pursuit of people to quality of life, the especially current discomforting present situation of food security, make the demand of food quality detection transferred to family from department of collective.Yet legacy equipment is bulky, expensive, make a lot of families hang back to food inspection equipment.
Patent of invention " a kind of Domestic near-infrared detection device for food quality " (application number: 201210013708.1) disclose a kind of home-use detection device for food quality.This device comprises near-infrared luminous light source, optical filter, Fresnel Lenses, sample cell, detecting device, lock-in amplifier and microprocessor; Wherein, the near infrared ray that near-infrared luminous light source sends by after optical filter, Fresnel Lenses, sample cell, detecting device and lock-in amplifier, converting square-wave signal to, is processed in input microprocessor successively.This invention has following four shortcomings:
The first, because optical filter is arranged in the middle of near-infrared luminous light source and Fresnel Lenses, can't the filtering Fresnel Lenses and sample cell between the impact of other wavelength veiling glare that may be subject to, make the filter effect imperfection;
The second, in this patent of invention not openly the wavelength of optical filter be how many, therefore being interpreted as can only be through the light of a certain specific wavelength or wavelength coverage, if what see through is the light of some specific wavelengths, can not realize being detected under other wavelength; If what see through is the light of some particular range of wavelengths, in this scope, the light of each wavelength mixes, and the effect of detection is bad;
Three, the sample cell that this invention adopts belongs to container, the impact that will certainly receive the optical property of container wall materials or composition when near infrared light sees through chamber wall, and this impact can be delivered in testing result, makes testing result not accurate enough;
Four, this invention adopts dsp chip as processor, yet, after implant procedure, when not having the professional to modify, detection method is all definite constant, is unfavorable for the upgrading of detection method and the expansion of equipment.
Summary of the invention
In order to address the above problem, the present invention has designed a kind of near infrared ray domestic food pick-up unit and method, than prior art, not only improved filter effect but also there is measuring ability under different wave length, avoid loading the container of testing sample on the impact of measurement result, also there is good upgradability and extendability in addition simultaneously.
The object of the present invention is achieved like this:
Near infrared ray domestic food pick-up unit, set gradually near-infrared luminous diode, collimator objective, condenser lens, optical filter and detecting device along optical axis direction; The parallel outgoing after the collimator objective collimation of the near infrared light of near-infrared luminous diode emission, then converge on detecting device through condenser lens; Described near-infrared luminous diode is arranged on the focal position of collimator objective, and described optical filter and top, detecting device centre position, be provided with specimen holder; Described detecting device is provided with the interface that connects computing machine.
Above-mentioned near infrared ray domestic food pick-up unit, described near-infrared luminous diode comprises a light emitting diode be arranged on optical axis, the wavelength of described light emitting diode is in 900nm ~ 1000nm scope.
Above-mentioned near infrared ray domestic food pick-up unit, described near-infrared luminous diode comprises a plurality of light emitting diodes, equidistantly be distributed on the disk vertical with optical axis, described disk is at its place Plane Rotation, rotating shaft is parallel with optical axis, and described light emitting diode equals the distance of optical axis to rotating shaft to the distance of rotating shaft.
The near-infrared wavelength that described a plurality of light emitting diode sends is different, power is identical or wavelength is identical, power is different.
Above-mentioned near infrared ray domestic food pick-up unit, the wavelength of described optical filter is seven kinds of 800nm, 850nm, 900nm, 950nm, 1000nm, 1050nm and 1100nm.
Above-mentioned near infrared ray domestic food pick-up unit, be provided with clamp and hook on described specimen holder.
Near infrared ray domestic food detection method comprises the following steps:
Step a, adjust near-infrared luminous diode location, the near infrared light that it is sent is received by detecting device;
Step b, hang detected sample on specimen holder;
Step c, by placing optical filter, obtain the testing sample testing result under specific wavelength;
Steps d, utilize prior art to be analyzed testing result, draw test result.
Due near infrared ray domestic food pick-up unit of the present invention and method, by optical filter is placed between condenser lens and detecting device, avoid the parasitic light of other wavelength of condenser lens reflection or refraction, improved filter effect; There is the measuring ability under different wave length by optical filter, the realization of setting different wave length, make measurement result abundanter, more perfect; Replace with specimen holder by the sample cell by prior art, make light direct irradiation sample, avoid the impact of sample cell sidewall optical property on measurement result, improve the accuracy of measurement result; By the interface be connected with computing machine is set, realize that the computing machine of data is processed, make this equipment there is good upgradability and extendability.
The accompanying drawing explanation
Fig. 1 is the near infrared ray domestic food structure of the detecting device schematic diagram of the specific embodiment of the invention one.
Fig. 2 is the specific embodiment of the invention two and three near infrared ray domestic food structure of the detecting device schematic diagram.
Fig. 3 is near infrared ray domestic food detection method process flow diagram of the present invention.
In figure: 1 near-infrared luminous diode, 2 collimator objectives, 3 condenser lenses, 4 optical filters, 5 detecting devices, 6 specimen holders, 7 disks.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the invention is described in further detail.
Specific embodiment one
As shown in Figure 1, this device sets gradually near-infrared luminous diode 1, collimator objective 2, condenser lens 3, optical filter 4 and detecting device 5 along optical axis direction to the near infrared ray domestic food structure of the detecting device schematic diagram of the present embodiment; The parallel outgoing after collimator objective 2 collimations of the near infrared light of near-infrared luminous diode 1 emission, then converge on detecting device 5 through condenser lens 3; Described near-infrared luminous diode 1 is arranged on the focal position of collimator objective 2, and described optical filter 4 and detecting device 5 tops, centre position, be provided with specimen holder 6; Described detecting device 5 is provided with the USB interface that connects computing machine, and is connected with computing machine by the USB line.
Above-mentioned near infrared ray domestic food pick-up unit, described near-infrared luminous diode 1 comprises a light emitting diode be arranged on optical axis, the wavelength of described light emitting diode is in 900nm ~ 1000nm scope; The wavelength of described optical filter 4 is seven kinds of 800nm, 850nm, 900nm, 950nm, 1000nm, 1050nm and 1100nm; Be provided with clamp and hook on described specimen holder 6.
As shown in Figure 3, the method comprises the following steps the near infrared ray domestic food detection method process flow diagram of the present embodiment:
Step a, adjust near-infrared luminous diode 1 position, the near infrared light that it is sent is received by detecting device 5;
Step b, on specimen holder 6, hang detected sample;
Step c, by placing optical filter 4, obtain the testing sample testing result under specific wavelength; Be specially: the optical filter 4 of a wavelength of every placement, obtain one group of testing result, after seven groups of optical filters 4 have been placed, obtain seven groups of testing results;
Steps d, utilize prior art to be analyzed testing result, draw test result.
Specific embodiment two
As shown in Figure 2, this device sets gradually near-infrared luminous diode 1, collimator objective 2, condenser lens 3, optical filter 4 and detecting device 5 along optical axis direction to the near infrared ray domestic food structure of the detecting device schematic diagram of the present embodiment; The parallel outgoing after collimator objective 2 collimations of the near infrared light of near-infrared luminous diode 1 emission, then converge on detecting device 5 through condenser lens 3; Described near-infrared luminous diode 1 is arranged on the focal position of collimator objective 2, and described optical filter 4 and detecting device 5 tops, centre position, be provided with specimen holder 6; Described detecting device 5 is provided with the USB interface that connects computing machine, and is connected with computing machine by the USB line.
Above-mentioned near infrared ray domestic food pick-up unit, described near-infrared luminous diode 1 comprises four light emitting diodes, equidistantly be distributed on the disk vertical with optical axis 7, described disk 7 is at its place Plane Rotation, rotating shaft is parallel with optical axis, and described light emitting diode equals the distance of optical axis to rotating shaft to the distance of rotating shaft.
The wavelength of described optical filter 4 is seven kinds of 800nm, 850nm, 900nm, 950nm, 1000nm, 1050nm and 1100nm; Be provided with clamp and hook on described specimen holder 6; The near-infrared wavelength that described a plurality of light emitting diode sends is different, power is identical, and the reason of selecting like this is with optical filter 4, to match by the near-infrared luminous diode 1 of different wave length, can obtain better filter effect.
As shown in Figure 3, the method comprises the following steps the near infrared ray domestic food detection method process flow diagram of the present embodiment:
Step a, adjust near-infrared luminous diode 1 position, the near infrared light that it is sent is received by detecting device 5; Be specially: rotating circular disk 7 makes the light emitting diode of required wavelength be positioned at optical axis position;
Step b, on specimen holder 6, hang detected sample;
Step c, by placing optical filter 4, obtain the testing sample testing result under specific wavelength; Be specially: place the optical filter 4 corresponding with the light emitting diode wavelength, as the wavelength of light emitting diode is 850nm ± 10nm, place the optical filter 4 of 850nm;
Steps d, utilize prior art to be analyzed testing result, draw test result.
Specific embodiment three
As shown in Figure 2, this device sets gradually near-infrared luminous diode 1, collimator objective 2, condenser lens 3, optical filter 4 and detecting device 5 along optical axis direction to the near infrared ray domestic food structure of the detecting device schematic diagram of the present embodiment; The parallel outgoing after collimator objective 2 collimations of the near infrared light of near-infrared luminous diode 1 emission, then converge on detecting device 5 through condenser lens 3; Described near-infrared luminous diode 1 is arranged on the focal position of collimator objective 2, and described optical filter 4 and detecting device 5 tops, centre position, be provided with specimen holder 6; Described detecting device 5 is provided with the USB interface that connects computing machine, and is connected with computing machine by the USB line.
Above-mentioned near infrared ray domestic food pick-up unit, described near-infrared luminous diode 1 comprises four light emitting diodes, equidistantly be distributed on the disk vertical with optical axis 7, described disk 7 is at its place Plane Rotation, rotating shaft is parallel with optical axis, and described light emitting diode equals the distance of optical axis to rotating shaft to the distance of rotating shaft.
The wavelength of described optical filter 4 is seven kinds of 800nm, 850nm, 900nm, 950nm, 1000nm, 1050nm and 1100nm; Be provided with clamp and hook on described specimen holder 6; The near-infrared wavelength that described a plurality of light emitting diode sends is identical, power is different, and the reason of selecting like this is can be by selecting the light emitting diode of different capacity, the applicable different testing sample of transmitance, the measurement sample type of increase apparatus of the present invention.
As shown in Figure 3, the method comprises the following steps the near infrared ray domestic food detection method process flow diagram of the present embodiment:
Step a, adjust near-infrared luminous diode 1 position, the near infrared light that it is sent is received by detecting device 5; Be specially: rotating circular disk 7 makes the light emitting diode of power demand be positioned at optical axis position;
Step b, on specimen holder 6, hang detected sample;
Step c, by placing optical filter 4, obtain the testing sample testing result under specific wavelength;
Steps d, utilize prior art to be analyzed testing result, draw test result.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, anyly is familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.

Claims (7)

1. near infrared ray domestic food pick-up unit, is characterized in that setting gradually near-infrared luminous diode (1), collimator objective (2), condenser lens (3), optical filter (4) and detecting device (5) along optical axis direction; The parallel outgoing after collimator objective (2) collimates of the near infrared light of near-infrared luminous diode (1) emission, then pass through condenser lens (3) and converge on detecting device (5); Described near-infrared luminous diode (1) is arranged on the focal position of collimator objective (2), and described optical filter (4) and top, detecting device (5) centre position, be provided with specimen holder (6); Described detecting device (5) is provided with the interface that connects computing machine.
2. near infrared ray domestic food pick-up unit according to claim 1, it is characterized in that described near-infrared luminous diode (1) comprises a light emitting diode be arranged on optical axis, the wavelength of described light emitting diode is in 900nm ~ 1000nm scope.
3. near infrared ray domestic food pick-up unit according to claim 1, it is characterized in that described near-infrared luminous diode (1) comprises a plurality of light emitting diodes, equidistantly be distributed on the disk vertical with optical axis (7), described disk (7) is at its place Plane Rotation, rotating shaft is parallel with optical axis, and described light emitting diode equals the distance of optical axis to rotating shaft to the distance of rotating shaft.
4. near infrared ray domestic food pick-up unit according to claim 3, is characterized in that the near-infrared wavelength that described a plurality of light emitting diode sends is different, power is identical or wavelength is identical, power is different.
5. near infrared ray domestic food pick-up unit according to claim 1, the wavelength that it is characterized in that described optical filter (4) is seven kinds of 800nm, 850nm, 900nm, 950nm, 1000nm, 1050nm and 1100nm.
6. near infrared ray domestic food pick-up unit according to claim 1, is characterized in that being provided with clamp and hook on described specimen holder (6).
7. near infrared ray domestic food detection method is characterized in that comprising the following steps:
Step a, adjust near-infrared luminous diode (1) position, the near infrared light that it is sent is received by detecting device (5);
Step b, at the upper detected sample that hangs of specimen holder (6);
Step c, by placing optical filter (4), obtain the testing sample testing result under specific wavelength;
Steps d, utilize prior art to be analyzed testing result, draw test result.
CN201310480036.XA 2013-10-15 2013-10-15 Near infrared household food detection device and method Pending CN103487400A (en)

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Publication number Priority date Publication date Assignee Title
GB2528348A (en) * 2014-04-14 2016-01-20 Fondarex Sa Device and method for measuring the moisture in die casting molds
CN105866066A (en) * 2015-05-29 2016-08-17 深圳市琨伦创业投资有限公司 Crop-nutrition security detection device
CN111504296A (en) * 2020-04-24 2020-08-07 武汉光迅科技股份有限公司 Optical transceiver module and optical fiber sensing device

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CN105866066B (en) * 2015-05-29 2020-04-28 深圳市琨伦创业投资有限公司 Crop nutrition safety detection device
CN111504296A (en) * 2020-04-24 2020-08-07 武汉光迅科技股份有限公司 Optical transceiver module and optical fiber sensing device

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Application publication date: 20140101