CN103760174A - Automatic calibrating microwave moisture measuring equipment for papermaking felt - Google Patents

Automatic calibrating microwave moisture measuring equipment for papermaking felt Download PDF

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Publication number
CN103760174A
CN103760174A CN201410045552.4A CN201410045552A CN103760174A CN 103760174 A CN103760174 A CN 103760174A CN 201410045552 A CN201410045552 A CN 201410045552A CN 103760174 A CN103760174 A CN 103760174A
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CN
China
Prior art keywords
microwave
cavity
felt
measurement
isolator
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.)
Pending
Application number
CN201410045552.4A
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Chinese (zh)
Inventor
周骏
谢宗国
戴永君
周兴富
阳安源
廖洁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SICHUAN VANOV TECHNOLOGY FABRIC Co Ltd
Original Assignee
SICHUAN VANOV TECHNOLOGY FABRIC Co Ltd
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Filing date
Publication date
Application filed by SICHUAN VANOV TECHNOLOGY FABRIC Co Ltd filed Critical SICHUAN VANOV TECHNOLOGY FABRIC Co Ltd
Priority to CN201410045552.4A priority Critical patent/CN103760174A/en
Publication of CN103760174A publication Critical patent/CN103760174A/en
Pending legal-status Critical Current

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Abstract

The invention discloses automatic calibrating microwave moisture measuring equipment for papermaking felt. A microwave scanning source is connected with an isolator; the isolator is connected with a microwave cavity; the microwave cavity is connected with a microwave detector and a microwave mixer; the microwave detector is connected with a scanning signal generator through a microwave tracker; the microwave mixer is connected with a microwave local oscillate source and a high-speed comparator; the microwave cavity is a cylindrical cavity; a resonance bar of which the diameter is one fifth of that of the cylindrical cavity is arranged inside the cavity. The automatic calibrating microwave moisture measuring equipment for the papermaking felt has the advantages as follows: on-line measurement can be achieved on the felt, which moves at a high speed; the abnormal condition of moisture content of the felt can be found in advance; the production waste caused by waste paper is reduced; a one-level boss is arranged additionally, so that interfered model can be controlled effectively, and the measuring results is unlikely to be influenced by other non-measurement model, and the measurement accuracy of products can be improved greatly.

Description

Auto-scaling felt microwave measurement for moisture content device
Technical field
The present invention relates to a kind of humidity detector, specifically, relate to a kind of auto-scaling felt microwave measurement for moisture content device.
Background technology
Felt is the crucial consumptive material as modern paper technology, and the width of woollen blanket can reach 10 meters, and length can reach km.And moisture in felt is very important technological parameter in paper-making process, the size of its moisture directly affects the quality of finished paper.Due to the felt state in high-speed and continuous motion in process of production, monoblock woollen blanket is a huge complete entirety, can not sample and carry out off-line test.Do not have at present professional method to carry out moisture measurement to it, more can only judge roughly by paper effect out the moisture situation of woollen blanket.
Summary of the invention
For above-mentioned deficiency of the prior art, the invention provides one rational in infrastructure, can on the woollen blanket of high-speed motion, realize the auto-scaling felt microwave measurement for moisture content device of on-line measurement.
The technical solution used in the present invention is: auto-scaling felt microwave measurement for moisture content device, comprise microprocessor, and microprocessor is connected with sweep generator, temperature sensor and display control unit respectively; Sweep generator is connected with Microwave Scanning source; Microwave Scanning source is connected with isolator, and isolator is connected with microwave cavity, and microwave cavity is connected with microwave mixer with microwave detector; Microwave detector is connected with microwave tracker, and microwave tracker is connected with sweep generator; Microwave mixer is connected with high-speed comparator with microwave local oscillator, high-speed comparator is connected with high speed calculator, high speed calculator is connected with microprocessor: described microwave cavity is cylindrical cavity, is provided with the resonant rod that diameter is cylindrical cavity diameter 1/5th in cavity; Cylindrical cavity arranged outside has one-level boss; Described microwave detector sensor setting is in the middle and lower part of one-level boss.
The beneficial effect of the relative prior art of the present invention:
Auto-scaling felt microwave measurement for moisture content device of the present invention can be realized on-line measurement on the woollen blanket of high-speed motion, can find in advance the abnormal conditions of woollen blanket moisture, reduces the production waste causing because of waste paper; Increased one-level boss, by this boss is set, reduced the energy loss that electromagnetic wave causes because measuring the radiation of end face, can effectively suppress to disturb mould, the interference that makes test result more not be vulnerable to other non-measurement modes has improved the measuring accuracy of product greatly.
Accompanying drawing explanation
Fig. 1 is auto-scaling felt microwave measurement for moisture content apparatus system block diagram of the present invention;
Fig. 2 is the main TV structure schematic diagram of the microwave cavity of auto-scaling felt microwave measurement for moisture content device of the present invention;
Fig. 3 be auto-scaling felt microwave measurement for moisture content device of the present invention microwave cavity look up structural representation.
Critical piece symbol description in accompanying drawing:
In figure:
1, microwave cavity 2, one-level boss
3, resonant rod 4, microwave detector sensor.
Embodiment
Referring to drawings and Examples, the present invention will be described in detail:
Accompanying drawing 1-3 is known, and auto-scaling felt microwave measurement for moisture content device, comprises microprocessor, and microprocessor is connected with sweep generator, temperature sensor and display control unit respectively; Sweep generator is connected with Microwave Scanning source; Microwave Scanning source is connected with isolator, and isolator is connected with microwave cavity 1, and microwave cavity 1 is connected with microwave mixer with microwave detector; Microwave detector is connected with microwave tracker, and microwave tracker is connected with sweep generator; Microwave mixer is connected with high-speed comparator with microwave local oscillator, high-speed comparator is connected with high speed calculator, high speed calculator is connected with microprocessor: described microwave cavity 1 is cylindrical cavity, and in cavity, being provided with diameter is the resonant rod 3 of cylindrical cavity diameter 1/5th; Cylindrical cavity arranged outside has one-level boss 2; Described microwave detector sensor 4 is arranged on the middle and lower part of one-level boss 2.
Auto-scaling felt microwave measurement for moisture content device of the present invention can be realized on-line measurement on the woollen blanket of high-speed motion, can find in advance the abnormal conditions of woollen blanket moisture, reduces the production waste causing because of waste paper; Increased one-level boss, by this boss is set, reduced the energy loss that electromagnetic wave causes because measuring the radiation of end face, can effectively suppress to disturb mould, the interference that makes test result more not be vulnerable to other non-measurement modes has improved the measuring accuracy of product greatly.
Auto-scaling felt microwave measurement for moisture content device of the present invention, workflow is as follows:
Microwave Sweep Source, under the frequency sweep instruction of processor, produces by sweep generator the sine sweep signal that frequency is 100Hz.Microwave Sweep Source is under the excitation of this signal, by inner VCO(voltage controlled oscillator) produce the frequency sweeping in frequency range, fL and fH represent the minimum and highest frequency of sweep frequency, and the concrete size of its frequency values is to be set by the design parameter of inner VCO.The fL of native system and fH are respectively 2.8GHz and 3GHz, swept signal source with p.s. the frequency of 100 times signal is carried out to the scanning of 2.8GHz to 3GHz.Swept-frequency signal enters in microwave cavity by isolator, and wherein the effect of isolator is the microwave signal suppressing due to microwave cavity transmitting, to guarantee not being interfered of output signal.
Microwave cavity is to be actually a Q value to be about 500 the arrowband wave filter of beginning to speak, and only has the signal of " characteristic frequency " could pass through this wave filter.And should " characteristic frequency " be to change to some extent along with the moisture of the face of beginning to speak, thereby native system utilizes the variable quantity of this frequency of measurement to try to achieve moisture.
Auto-scaling felt microwave measurement for moisture content device of the present invention, increased one-level boss, by this boss is set, reduced the energy loss that electromagnetic wave causes because measuring the radiation of end face, Q value also further improves, boss can effectively suppress TM111 and TM012 disturbs mould, makes test result more not be vulnerable to the interference of other non-measurement modes.Q value is that product is measured very important parameter, by the Q value improving, has improved greatly the measuring accuracy of product.The Q value of microwave cavity is about 500, and the physical definition of Q value is as follows: the ability of Q=unit interval ability/unit interval loss of storing.
Cavity loss is less, and Q value is larger, and Q value is while being intuitively reflected in the filtering of cavity, and Q value is larger, and curve is more sharp-pointed, and curve is more sharp-pointed, and the accuracy that identifies this dot frequency value is higher, thereby makes resolution higher.
The principle of work of this resonator cavity is as follows:
During swept-frequency signal process woollen blanket, through the microwave signal of resonator cavity, by microwave detector, carried out detection, rectified signal locks crest frequency by frequency tracking circuit AFC, and the concrete operations of locking are completed by signal frequency sweep generator.Once Frequency Locking, system just can enter measuring state.The crest frequency signal of locking enters microwave mixer, and microwave mixer, under the acting in conjunction of survey frequency and local frequency, is exported the difference of survey frequency and local oscillation signal.This output signal is to be the sinusoidal signal of difference frequency in the cycle.
Sinusoidal signal enters high-speed comparator, and by high-speed comparator, signal is transformed to by sine wave the square wave that frequency is consistent with it.Square-wave signal enters high-speed counter again, by the frequency number of measuring unit's time, the result recording is sent in microprocessor, completes once complete measuring period.
The present invention is not limited to above-mentioned concrete embodiment, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, all conversion of having done, within all dropping on protection scope of the present invention.

Claims (1)

1. auto-scaling felt microwave measurement for moisture content device, is characterized in that: comprise microprocessor, microprocessor is connected with sweep generator, temperature sensor and display control unit respectively; Sweep generator is connected with Microwave Scanning source; Microwave Scanning source is connected with isolator, and isolator is connected with microwave cavity, and microwave cavity is connected with microwave mixer with microwave detector; Microwave detector is connected with microwave tracker, and microwave tracker is connected with sweep generator; Microwave mixer is connected with high-speed comparator with microwave local oscillator, high-speed comparator is connected with high speed calculator, high speed calculator is connected with microprocessor: described microwave cavity is cylindrical cavity, is provided with the resonant rod that diameter is cylindrical cavity diameter 1/5th in cavity; Cylindrical cavity arranged outside has one-level boss; Described microwave detector sensor setting is in the middle and lower part of one-level boss.
CN201410045552.4A 2014-02-08 2014-02-08 Automatic calibrating microwave moisture measuring equipment for papermaking felt Pending CN103760174A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410045552.4A CN103760174A (en) 2014-02-08 2014-02-08 Automatic calibrating microwave moisture measuring equipment for papermaking felt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410045552.4A CN103760174A (en) 2014-02-08 2014-02-08 Automatic calibrating microwave moisture measuring equipment for papermaking felt

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101267191A (en) * 2007-03-13 2008-09-17 广州埃信电信设备有限公司 Cavity resonancer with temperature stabilization and compensation function
CN202101951U (en) * 2011-06-22 2012-01-04 华北电力大学(保定) Temperature self-compensation microwave sensor used for measuring steam humidity
CN102539449A (en) * 2010-09-28 2012-07-04 豪尼机械制造股份公司 Device and method for processing and measuring properties of a moving rod of material
CN203119067U (en) * 2013-01-25 2013-08-07 华为技术有限公司 Cavity filter
CN203786057U (en) * 2014-02-08 2014-08-20 四川环龙技术织物有限公司 Device for microwave measuring of moisture of automatic scaling paper-making felt

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101267191A (en) * 2007-03-13 2008-09-17 广州埃信电信设备有限公司 Cavity resonancer with temperature stabilization and compensation function
CN102539449A (en) * 2010-09-28 2012-07-04 豪尼机械制造股份公司 Device and method for processing and measuring properties of a moving rod of material
CN202101951U (en) * 2011-06-22 2012-01-04 华北电力大学(保定) Temperature self-compensation microwave sensor used for measuring steam humidity
CN203119067U (en) * 2013-01-25 2013-08-07 华为技术有限公司 Cavity filter
CN203786057U (en) * 2014-02-08 2014-08-20 四川环龙技术织物有限公司 Device for microwave measuring of moisture of automatic scaling paper-making felt

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
张淑娥: "空气湿度微波谐振腔测量方法", 《中国电机工程学报》 *
钟茂声: "微波腔传感器在工农业生产中的应用", 《传感器世界》 *

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Application publication date: 20140430