CN100501374C - Near infrared quantitative water content measurement method for paper - Google Patents
Near infrared quantitative water content measurement method for paper Download PDFInfo
- Publication number
- CN100501374C CN100501374C CNB2004100735998A CN200410073599A CN100501374C CN 100501374 C CN100501374 C CN 100501374C CN B2004100735998 A CNB2004100735998 A CN B2004100735998A CN 200410073599 A CN200410073599 A CN 200410073599A CN 100501374 C CN100501374 C CN 100501374C
- Authority
- CN
- China
- Prior art keywords
- signal
- near infrared
- moisture
- measuring
- filler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The quantitative moisture measurement method for near infrared paper comprises: modulating the infrared light into near infrared lights with different wavelength and arranged as chronological order to reflect with a reflector to the emission integral semisphere to reflect and cross the paper to focus on a optical-electrical converter, sending the converted electric signal to microprocessor for pretreatment; then, transmitting into a data centralized processing unit to recognize and divide into reference signal with one path to control front amplifier and another path as the reference signal and measurement signal; calculating in the processing unit to obtain quantitative moisture content. This invention realizes online measurement with high accuracy and low cost.
Description
Technical field
The present invention relates to a kind of near-infrared measuring method of Substance moisture, be specifically related to a kind of near-infrared measuring method of Substance moisture.
Background technology
At present, domestic not appearing in the newspapers as yet adopts near infrared ray that paper is carried out the integrated measurement of quantitative moisture.Abroad have and adopt infrared ray that paper is measured, but its method only is the measurement at individual quantities.Though also can realize the fiber of paper, the measurement of moisture by two even multiple devices, can't realize the quantitative measurement of composition complexity in the paper, thereby also just can't realize the online integrated measurement of the quantitative moisture of paper.At present generally adopt the β ray technology for the measurement of Substance both at home and abroad, in the testing process of paper production line: measure moisture with the near infrared moisture instrument, and measure quantitatively, promptly with β ray quantitative instrument, what adopt is a kind of multiple measurement pattern, and equipment cost is higher relatively.In addition, adopt the β ray technology to have radioactive contamination.
Summary of the invention
The object of the present invention is to provide a kind of near infrared Substance drimeter, it has solved only is measurement at individual quantities in the background technology, can't realize the technical matters of the integrated on-line measurement of Substance moisture.
Technical solution of the present invention is:
A kind of near infrared quantitative water content measurement method for paper, its special character is: this method may further comprise the steps:
1). will modulate by the light that infrared light supply 1 sends, leach at least five near infrared monochromatic light bundle different wave length, that arrange in chronological order;
2). near infrared monochromatic light exposes on the reverberator 10 successively, by reverberator 10 with the near infrared reflection of monochromatic light to emission integration hemisphere 4;
3). emission integration hemisphere 4 with the near infrared reflection of monochromatic light to measured object 5;
4). the near infrared light that passes measured object 5 converges through accepting converging device, arrives on the photoelectric commutator 8;
5). photoelectric commutator 8 is converted to electric signal with light signal, delivers to signal processing system 7;
6). the processing of described signal processing system 7 comprises the steps:
(1). the prime amplifier that the electric signal of photoelectric commutator 8 outputs is input to signal processing system 7 amplifies;
(2). the signal after the amplification is delivered to A/D converter and is converted digital signal to;
(3). deliver to microprocessor system by the digital signal of A/D converter output and carry out pre-service;
(4). pretreated digital signal is sent into the centralized data processing unit by the serial data communication mouth;
(5). the digital signal that receives is at first discerned in the centralized data processing unit, and digital signal is divided into reference signal and measuring-signal;
(6). the gain control circuit of leading up to of reference signal is after treatment delivered to described prime amplifier, control the enlargement factor of described prime amplifier, make described prime amplifier when tested physical state changes, keep the reference signal size constant; Another road is as the reference signal of measuring-signal;
7). the centralized data processing unit carries out calculation process according to setting operational pattern to data, the principle that described setting operational pattern is followed is: when a kind of component content in calculating fiber, moisture, three kinds of compositions of filler, its measuring-signal is identical to the influence of all the other two kinds of compositions with reference signal;
8). do the thickness of measured object, density and filler, pulp content change not? be, after then carrying out dynamic compensation, revising, obtain measured object quantitatively, moisture result; Not, then directly obtain quantitative, the moisture result of measured object;
9). quantitative, moisture result are delivered to display show; Or simultaneously quantitative, moisture result are sent into recording unit or quantitative moisture control system with standard serial communication port or normalized current signal.
Above-mentioned measured object 5 quantitatively mainly comprise fiber, filler and moisture; The selection of the monochromatic reference wavelength of described near infrared, measurement wavelength should be satisfied: when measuring fiber, its measuring-signal is identical to the influence of moisture, filler with reference signal; When measuring moisture, the reference signal of moisture, measuring-signal are identical to the influence of fiber, filler; When measuring filler, the reference signal of filler, measuring-signal are identical to the influence of fiber, moisture.
The near infrared monochromatic light that leaches after the above-mentioned modulation is advisable to adopt five bundle near infrared monochromatic light different wave length, that arrange in chronological order.
Above-mentioned modulation system can adopt the filter wheel that the modulation optical filter is housed 3 of modulating motor 2 driven rotary to obtain the monochromatic light of different wave length.
The above-mentioned converging device of accepting can be constituted by light cone 9 and condenser 6, or is constituted by integration hemisphere and condenser 6.
The present invention has the following advantages:
1. use the quantitative of near-infrared method on-line measurement paper, can realize that the real-time process of production line Substance moisture detects, do not have radioactive contamination.
2. realize the on-line dynamic measurement of quantitative and two parameters of moisture of paper with an equipment, promptly realized the integrated measurement of Substance moisture, reduced equipment cost.
According to the unevenness of paper, the fiber that is interweaved to each of light to physical characteristicss such as diversities, select for use large tracts of land to measure hot spot, light signal is through ovennodulation, insensitive during measurement to influences such as the physical state variation of paper, the fluctuation of paper, extraneous light, make the strong interference immunity of instrument, to the adaptability enhancing of paper and environment for use.
4. by accurate selection, the coupling of monochromatic wavelength, can make the parameter of data processing operation model obtain optimum matching, solve the influence of filler variation measurement result.
5. to the accurate measurement of multiple components in the paper, adopt at least five bundle near infrared monochromatic light, form monochromatic optimum matching, have higher precision thereby make to measure.
Description of drawings
Fig. 1 is a structural diagrams intention of the present invention;
Fig. 2 is the process flow diagram of signal processing system of the present invention.
Drawing reference numeral explanation: 1-infrared light supply, 2-modulating motor, 3-filter wheel, 4-emission integration hemisphere, 5-measured object, 6-condenser, 7-signal processing system, 8-photoelectric commutator, 9-light cone, 10-reverberator, 11-lens, 12-condenser.
Embodiment
The present invention according to the unevenness of paper, the fiber that is interweaved to each of light to physical characteristicss such as diversities, select for use large tracts of land to measure hot spot, and light signal is through ovennodulation, make that instrument physical state to paper when measuring changes, influences such as the fluctuation of paper and extraneous light are insensitive, make the present invention have stronger adaptability with this.
The present invention utilizes the absorption characteristic of paper component near infrared light, find out the selectivity absorption feature of each component near infrared spectrum, leach five near infrared monochromatic light by the colour filter light splitting technology from infrared spectrum to multi beam, adopt the transmission-type device, and overcome additive error by correction function, utilize Single Chip Microcomputer (SCM) system to carry out data processing, realize integrated on-line measurement Substance moisture.
Realize the accurate measurement of Substance, must accurately measure fiber content, filer content and the moisture of paper.The light beam number that near infrared monochromatic light is chosen is many more, and measuring accuracy is high more, but generally is advisable to leach five bundle near infrared monochromatic light during practical application.In the monochromatic light of five different wave lengths, have three monochromic beams to reflect fiber, the filler of paper, the measuring-signal of moisture respectively, a monochromic beam is as reference signal, also has a monochromic beam to be used for relation between balance fiber, filler, the moisture three.
The concrete implementation step of the present invention is as follows:
1. the light that is sent by infrared light supply 1 through modulation, leaches at least five near infrared monochromatic light bundle different wave length, that arrange in chronological order.Modulation system is that 3 pairs of light signals of the filter wheel that optical filter is housed of modulating motor 2 driven rotary are modulated.This modulation system is convenient to data sampling.
2. the outer light of near infrared monochrome shines on the reverberator 10 successively, reverberator 10 with the near infrared reflection of monochromatic light to emission integration hemisphere 4.
Emission integration hemisphere 4 nearly infrared light reflection be on the paper to measured object 5.
4. the near infrared light that passes tested paper converges on the photoelectric commutator 8 through accepting converging device.Accept converging device and can adopt light cone 9 and condenser 6 to constitute, or constitute, also can adopt other known methods by integration hemisphere and condenser 6.
5. photoelectric commutator 8 is converted to electric signal with light signal, delivers to signal processing system 7 and handles.Referring to Fig. 1.
The treatment scheme of signal processing system 7 is as follows:
1) prime amplifier that is input to signal processing system 7 from the electric signal of photoelectric commutator 8 output amplifies.Because it is very faint to be input to the signal of prime amplifier, so require prime amplifier to have the characteristic that gain is high, noise is little.
2) prime amplifier is amplified to certain amplitude with feeble signal, delivers to A/D converter and converts digital signal to.
3) deliver to microprocessor system by the digital signal of A/D converter output, by microprocessor system data are carried out pre-service, promptly, the digital signal of A/D conversion is classified by reference signal, measuring-signal, and carry out filtering, obtain one group with the corresponding digital signal of simulating signal be sent to the centralized data processing unit.
4) by the serial data communication mouth data are sent into the centralized data processing unit through pretreated data.
5) digital signal that receives is at first discerned in the centralized data processing unit, and is divided into reference signal and measuring-signal two big classes by the difference requirement of each signal.
6) reference signal is synthesized into through two paths of signals, the effect of reference signal has two: the first is after data processing, deliver to prime amplifier by gain control circuit, the enlargement factor of control prime amplifier, make prime amplifier when tested physical state changes, keep the reference signal size constant; It two is as the reference signal of measuring paper fibre, filler, moisture signal.When measuring fiber, filler, moisture,, all be the accuracy of measuring in order to ensure fiber, filler, moisture though the method that reference signal adopts when synthetic is different.
6. the centralized data processing unit carries out calculation process according to setting operational pattern to data, the principle that described setting operational pattern is followed is: when a kind of component content in calculating fiber, moisture, three kinds of compositions of filler, its measuring-signal is identical to the influence of all the other two kinds of compositions with reference signal;
Do 7. the thickness of measured object, density and filler, pulp content change not? be, after then carrying out dynamic compensation, revising, obtain measured object quantitatively, moisture result; Not, then directly obtain quantitative, the moisture result of measured object;
8. quantitative, moisture result are delivered to charactron or the demonstration of liquid crystal display display; Quantitative, moisture result recording unit or quantitative moisture control system be can be sent into standard serial communication port or normalized current signal 0～10mA, 4～20mA simultaneously, data recording or quantitative moisture control system realized.Referring to Fig. 2.
Measured object of the present invention is that the composition of paper is formed very complexity, though have only fiber, filler, three kinds of fundamental components of moisture, for the paper of different cultivars, purposes, the composition of its fiber, filler, moisture is all different.Substance mainly comprises three parts:
1) fiber.Be divided into xylogen, leather fiber, cotton fiber, bamboo fibre etc., the kind difference of fiber, then its molecular structure, spectral characteristic difference.
2) filler.The kind difference of paper, purposes difference, then the kind composition difference of filler.
3) moisture.
Measure the content of paper fibre, filler, these three compositions of moisture, promptly get Substance.When measuring various composition, need to consider influencing each other between each composition.Therefore,, adopt five bundles or the above near infrared monochromatic light of five bundles, form monochromatic optimum matching, not only can improve measuring accuracy, and can realize the integrated measurement of Substance moisture the accurate measurement of multiple components in the paper.
The selection of correlation parameter of the present invention, correction are advisable to follow following principle:
1. near infrared reference wavelength, the selection of measuring wavelength should be satisfied: when measuring fiber, its measuring-signal and reference signal are identical to the influence of moisture, filler.
2. when measuring moisture, the reference of moisture, measuring-signal are identical to the influence of fiber, filler.
3. when measuring filler, the reference measurement signal of filler is identical to the influence of fiber, moisture.
When paper thickness, when density changes, the path that near infrared light penetrates paper can change, and can adopt correction function that measurement result is revised.
5. the variation of production technology factor as what variation, the variation of intermittent pulp proportioning ratio, the variation of paper sheet thickness, the variation of paper density etc. of filler, all can bring additive error to measurement result, need compensate this additive error.
6. the principle of compensating error: internal relation and interactional inherent law according to fiber, filler, moisture are dynamically revised.
Claims (5)
1. near infrared quantitative water content measurement method for paper, it is characterized in that: this method may further comprise the steps
1). will modulate by the light that send infrared light supply (1), leach at least five near infrared monochromatic light bundle different wave length, that arrange in chronological order;
2). near infrared monochromatic light exposes on the reverberator (10) successively, by reverberator (10) with the near infrared reflection of monochromatic light to emission integration hemisphere (4);
3). the emission integration hemisphere (4) with the near infrared reflection of monochromatic light to measured object (5);
4). the near infrared light that passes measured object (5) converges through accepting converging device, arrives on the photoelectric commutator (8);
5). photoelectric commutator (8) is converted to electric signal with light signal, delivers to signal processing system (7);
6). the processing of described signal processing system (7) comprises the steps:
(1). the prime amplifier that the electric signal of photoelectric commutator (8) output is input to signal processing system (7) amplifies;
(2). the signal after the amplification is delivered to A/D converter and is converted digital signal to;
(3). deliver to microprocessor system by the digital signal of A/D converter output and carry out pre-service;
(4). pretreated digital signal is sent into the centralized data processing unit by the serial data communication mouth;
(5). the digital signal that receives is at first discerned in the centralized data processing unit, and digital signal is divided into reference signal and measuring-signal;
(6). the gain control circuit of leading up to of reference signal is after treatment delivered to described prime amplifier, controls the enlargement factor of described prime amplifier, makes described prime amplifier when tested physical state changes, and keeps the reference signal size constant; Another road is as the reference signal of measuring-signal;
7). the centralized data processing unit carries out calculation process according to setting operational pattern to data, the principle that described setting operational pattern is followed is: when a kind of component content in calculating fiber, moisture, three kinds of compositions of filler, its measuring-signal is identical to the influence of all the other two kinds of compositions with reference signal;
8). do the thickness of measured object, density and filler, pulp content change not? be, after then carrying out dynamic compensation, revising, obtain measured object quantitatively, moisture result; Not, then directly obtain quantitative, the moisture result of measured object;
9). quantitative, moisture result are delivered to display show; Or simultaneously quantitative, moisture result are sent into recording unit or quantitative moisture control system with standard serial communication port or normalized current signal.
2. near infrared quantitative water content measurement method for paper according to claim 1 is characterized in that: described measured object (5) quantitatively mainly comprise fiber, filler and moisture; The selection of the monochromatic reference wavelength of described near infrared, measurement wavelength should be satisfied: when measuring fiber, its measuring-signal is identical to the influence of moisture, filler with reference signal; When measuring moisture, the reference signal of moisture, measuring-signal are identical to the influence of fiber, filler; When measuring filler, the reference signal of filler, measuring-signal are identical to the influence of fiber, moisture.
3. near infrared quantitative water content measurement method for paper according to claim 1 and 2 is characterized in that: the near infrared monochromatic light that leaches after the described modulation is five bundle near infrared monochromatic light different wave length, that arrange in chronological order.
4. near infrared quantitative water content measurement method for paper according to claim 3 is characterized in that: described modulation system is the monochromatic light that the filter wheel (3) that the modulation optical filter is housed of modulating motor (2) driven rotary obtains different wave length.
5. near infrared quantitative water content measurement method for paper according to claim 4 is characterized in that: the described converging device of accepting is constituted by light cone (9) and condenser (6), or is constituted by integration hemisphere and condenser (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100735998A CN100501374C (en) | 2004-12-31 | 2004-12-31 | Near infrared quantitative water content measurement method for paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100735998A CN100501374C (en) | 2004-12-31 | 2004-12-31 | Near infrared quantitative water content measurement method for paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1800825A CN1800825A (en) | 2006-07-12 |
| CN100501374C true CN100501374C (en) | 2009-06-17 |
Family
ID=36810956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100735998A Active CN100501374C (en) | 2004-12-31 | 2004-12-31 | Near infrared quantitative water content measurement method for paper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100501374C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8148690B2 (en) * | 2009-09-24 | 2012-04-03 | ABB, Ltd. | Method and apparatus for on-line web property measurement |
| WO2013147038A1 (en) * | 2012-03-28 | 2013-10-03 | 横河電機株式会社 | Substance properties measuring device |
| US9714865B2 (en) * | 2012-10-26 | 2017-07-25 | Sony Corporation | Light condensing unit, light condensing method, and optical detection system |
| CN105953719B (en) * | 2016-06-24 | 2019-06-14 | 国家档案局档案科学技术研究所 | Lossless archives paper measuring instrument and the method for measuring Paper Moisture and thickness simultaneously |
| JP2019015604A (en) | 2017-07-06 | 2019-01-31 | 横河電機株式会社 | Measuring apparatus |
| CN111122489B (en) * | 2019-12-27 | 2022-08-12 | 四川高达科技有限公司 | Method for measuring coating weight of coating composite material by infrared quantitative moisture sensor |
| CN112763573B (en) * | 2020-12-31 | 2024-02-06 | 绵阳同成智能装备股份有限公司 | Banner curve interference compensation method and system based on paper detection scanning device |
| CN115684075B (en) * | 2022-11-10 | 2023-05-09 | 西安力源光电科技有限责任公司 | Near-infrared non-woven fabric gram weight, fiber component content and moisture integrated measurement method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4466076A (en) * | 1981-05-15 | 1984-08-14 | Trebor Industries, Inc. | Apparatus for near infrared quantitative analysis with temperature variation correction |
| US4969115A (en) * | 1988-11-23 | 1990-11-06 | Futrex Inc. | Method and apparatus for identifying causes of repeatability problems in near infrared analytical instruments |
-
2004
- 2004-12-31 CN CNB2004100735998A patent/CN100501374C/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4466076A (en) * | 1981-05-15 | 1984-08-14 | Trebor Industries, Inc. | Apparatus for near infrared quantitative analysis with temperature variation correction |
| US4969115A (en) * | 1988-11-23 | 1990-11-06 | Futrex Inc. | Method and apparatus for identifying causes of repeatability problems in near infrared analytical instruments |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1800825A (en) | 2006-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101387605B (en) | Optical fiber agricultural land soil organic matter content rapid detector | |
| CN100501374C (en) | Near infrared quantitative water content measurement method for paper | |
| CN102661923A (en) | Complex monitor for automatically monitoring multiple parameters of water on line | |
| CN100595558C (en) | Transmittance pulsation method granule measuring method and its device | |
| CN103874915B (en) | Vitro detection and/or quantitative system are carried out by fluorescence method | |
| CN104062265A (en) | Detection device and detection method for multi-component gas in transformer oil based on spectrum analysis | |
| CN101645737B (en) | Optical-communication comprehensive test instrument | |
| CN103776529A (en) | Desktop laser power meter capable of real-time compensation and compensation method thereof | |
| CN201063015Y (en) | Apparatus for measuring permeance ratio of particle using microseism method | |
| CN203672786U (en) | Dual-wavelength-modulation photoelectric detection device for trace materials | |
| CN204462021U (en) | Fluorescence analyser | |
| CN102928081A (en) | Acousto-optic adjustable filtering type near-infrared spectrometer | |
| CN108254075A (en) | A kind of micro integrated CMOS fiber spectrometers | |
| CN109191819B (en) | Multi-point water quality monitoring and analyzing system and method based on clustering algorithm | |
| CN107449755A (en) | Quasi-distributed optical fiber gas concentration detection system and method | |
| CN201177600Y (en) | Portable near-infrared detector | |
| CN105911394B (en) | PIN-FET light-receiving component Auto-Test System | |
| CN202002879U (en) | Yellow wine ingredient content detecting device | |
| CN1995977A (en) | Light path self-compensation method for fiber-optic gas sensor and device therefor | |
| CN104865231B (en) | A kind of Multi-channel optical dissolved oxygen sensing method | |
| CN214894837U (en) | 96-hole microporous plate reader | |
| CN108736961A (en) | Optical fiber detector, system and method based on distributed vector network analyzer | |
| CN201251549Y (en) | Safe and rapid tea detecting instrument | |
| CN208921615U (en) | A kind of driving accurate photoelectric detector of modulating wave | |
| CN109361456B (en) | Method for measuring signal fluctuation correlation coefficient of bidirectional atmospheric turbulence optical channel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |