CN86102183A - Microwave carbonmeter - Google Patents
Microwave carbonmeter Download PDFInfo
- Publication number
- CN86102183A CN86102183A CN 86102183 CN86102183A CN86102183A CN 86102183 A CN86102183 A CN 86102183A CN 86102183 CN86102183 CN 86102183 CN 86102183 A CN86102183 A CN 86102183A CN 86102183 A CN86102183 A CN 86102183A
- Authority
- CN
- China
- Prior art keywords
- microwave
- signal
- measuring
- flying dust
- path
- 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
Links
Images
Landscapes
- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention utilizes the microwave carbonmeter that carbon granule designs big this characteristic of microwave energy absorption in the flying dust.It is made of flying dust path and measuring-signal path.The measuring-signal path is set up the waveguide T connector microwave signal is divided into two-way, then the error that caused divided by erasure signal power instability of two-way.At the attached microwave absorbing material of antenna box inwall and adopt the microwave broadband wave detector, the error that is caused with the erasure signal frequency drift, and set up the integrating circuit of dynamic scaling and get grey time marker, to improve the precision of dynamic scaling curve.
Description
The invention belongs to Microwave Measurement Technique.It is to utilize the microwave carbonmeter that carbon granule designs big this characteristic of microwave energy absorption in the flying dust.This carbonmeter is used for measuring the carbon content of large scale industry boiler fly ash.
In prior art, No. 1 Xian Radio Factory, Xian Modern Chemistry Inst., Leqing County Color Base has developed WCT-1 type microwave carbon instrument in 1984, referring to Fig. 2, it is made of flying dust path and measuring-signal path intersection, the cross unit of two-way is an antenna box (12) that has trumpet type emitting antenna (7) and a receiving antenna (9) and a flying dust pipeline (8), emitting antenna (7) is relative with the hydraucone of receiving antenna (9), and flying dust pipeline (8) is installed in the middle of two loudspeaker.The fly ash sampling equipment that flying dust is joined by the boiler flue spy (29) enters the flying dust pipeline (8) in the antenna box, discharge to constitute a flying dust path through lock gas ash ejector (15) then: the measuring-signal path is earlier by microwave signal of a microwave generator (1) output, through attenuator (32), isolator (3) arrives antenna box (12), and be radiated the antenna box space by emitting antenna (7), the signal that receiving antenna (9) receives is the relevant magnitude of voltage of carbon content in one of a microwave detector (33) output and flying dust pipeline, after through a subtraction circuit (34) signal and a reference level being carried out subtraction, go up at display (27) and to show.
Above-mentioned instrument mainly exists following problem: first, the signal power instability of microwave generator output, this is because environment temperature, supply voltage and aging all influential to microwave generator self, if above-mentioned factor changes, the signal power of its output also changes thereupon, adopt existing measuring-signal path, the instability of signal power must be reflected in the measured value, and therefore, the measuring error that it causes is very big.Second, the signal that receiving antenna (9) receives changes relevant with signal frequency, this is because the wooden partition around the antenna box has reflex to microwave, cause and in antenna box, formed complicated stationary field, when the oscillation frequency of microwave generator changes, the antinode of the stationary field in the antenna box, acute variation just takes place in the node position, enters also acute variation of the interior microwave energy of receiving antenna thereby make.Like this, just caused the generation of following situation: under the situation that carbon content is certain in flying dust pipeline (8), the voltage of microwave detector output is along with the change of signal frequency, change very anxious gathering, and the relation curve Changing Pattern of pairing voltage of each different carbon content and frequency is all different, they are crisscross, seek a corresponding working band preferably of voltage with carbon content, be a very difficult thing, therefore, the debugging of the static state of instrument requires a great deal of time and energy.After the static state debugging of instrument is finished, the frequency distribution of its energy operate as normal is in several narrow frequency bands, in narrow like this working band, because curvilinear motion is very empty, if generation signal frequency drift, can cause the appreciable variation of microwave detector output voltage, and signal frequency can be drifted about all because of the influence of factors such as environment temperature and supply voltage, so the measuring error that frequency drift is brought is difficult to estimate.In addition, existing microwave detector is tunable narrow-band demodulation device, goes the signal acquisition frequency to have certain blindness with this narrow-band demodulation device, bring difficulty for the accent machine, if the generation signal frequency drift is sought signal again again, make the stability of instrument reduce greatly.The 3rd, the dynamic scaling ratio of precision of instrument is relatively poor, the calibrating method that it adopts is: be engraved in when a certain and read a magnitude of voltage on the display, and then the ducted flying dust of corresponding this moment flying dust of taking-up, measure carbon content, draw the relation curve of different magnitudes of voltage and unburned carbon in flue dust at last, its problem is that flying dust is when passing through flying dust pipeline (8), it is random variation that its carbon content distributes, flying dust by the flying dust pipeline during this period of time in, shown magnitude of voltage be with the flying dust pipeline in the unburned carbon in flue dust relevant function that distributes, therefore, the a certain value of random variation voltage obviously is very coarse in getting during this period of time, and the mean carbon content of flying dust may not be corresponding in this magnitude of voltage and the flying dust pipeline theoretically.In addition, get opening the beginning and stopping constantly all using manual time-keeping of ash, promptly there is error again in inconvenience.
Because the existence of above problem, make that the measuring error of instrument is big, debugging and maintenance difficult, dynamic scaling curve low precision, be difficult to apply.
The objective of the invention is problem at above-mentioned existence, mainly the measuring-signal path to instrument improves, remove and disappear because the output power of microwave generator and the measuring error that instability caused of oscillation frequency, simplify the debug process of instrument, improve the precision of dynamic scaling curve, make it be tending towards perfect.
In order to eliminate the measuring error that instability caused of microwave generator output power, the measure of being taked is to be divided into two-way with the signal that the T connector of a waveguide is exported microwave generator, wherein one the tunnel through an isolator to antenna box, from antenna box through a microwave detector D
1Export a magnitude of voltage relevant, suppose wave detector D with carbon content
1The voltage of output is Um(1-KC), the Um in the formula is wave detector D when to be full of carbon content in the flying dust pipeline be 0% flying dust
1The magnitude of voltage of output, C is the percentage of carbon content in the flying dust, and K is a constant, and another microwave detector D is also directly arrived through an isolator in its another road
2, suppose wave detector D
2The voltage of output is Un.Un is directly proportional with Um, for the purpose of simplifying computing, supposes Un=Um, and the two-way magnitude of voltage is delivered in the signal processing circuit, with a divider circuit with two-way microwave detector D
1D
2The magnitude of voltage of output is divided by i.e.: (Um(1-KC))/(Um)=1-KC, the gained result is one and has nothing to do and only relevant with carbon content C numerical value with the microwave generator output power.In addition, two-way microwave path also can increase some devices as required, as: waveguide bend etc.
Error for the erasure signal frequency drift is produced solves the difficulty of static debugging, and crucial stationary field in eliminating antenna box is in case eliminated stationary field, wave detector D
1And D
2The ratio of output voltage and signal frequency are irrelevant, and therefore, under the situation that the carbon content of flying dust is certain in the flying dust pipeline, no matter be signal frequency drift, the oscillation frequency that still changes microwave generator can not cause any variation of divider output voltage.The concrete measure of eliminating stationary field is a microwave absorbing material of enclosing rubber or plastics filling graphite at the antenna box inwall.In order to overcome the job insecurity that signal frequency drift causes, microwave detector D of the present invention
1D
2All adopt the bandwidth microwave detector.
Precision for the dynamic scaling curve that improves instrument makes things convenient for dynamic scaling, has set up an integrator circuit in the instrument and has got grey time marker.The function of integrator is during this period of time the voltage of signal processor output to be carried out integration by the flying dust pipeline at flying dust, and this integrated value is only and the real corresponding voltage value of mean carbon content in the flying dust pipeline during this period of time.The function of getting grey time marker is that opening moment beginning and stopping constantly of ash got in indication.
After the present invention had carried out above-mentioned improvement, measuring accuracy improved greatly, and debugging is calibrated, maintenance is all very convenient.
Further specify the present invention below in conjunction with accompanying drawing.
The principle of work synoptic diagram of Fig. 1 microwave carbonmeter
The principle of work synoptic diagram of Fig. 2 WCT-1 type microwave carbonmeter
1 microwave bulk-effect oscillator, 2 waveguide T connectors, 3,4 isolators, 5 bandwidth microwave detection D
26 waveguide bends, 7 emitting antennas, 8 flying dust pipelines, 9 receiving antennas, 10 bandwidth microwave detector D
111 microwave absorbing materials, 12 antenna boxes, 13 signal processors 14 an ash self-regulated device, 15 lock gas ash ejectors 16 are got the excitatory amplifier 18 of ash time-delay monostable 17 electromagnetic relays (31) or door 19 and are got ash duration monostable 20 phase inverters 21,22 and the excitatory amplifiers 24 of door 23 electromagnetic relays (30) and get ash and continue lamp driving stage 25 and get lasting lamp 26 integrators 27 displays 28 of ash and get grey button 29 fly ash sampling equipments 30 electromagnetic relay 31(A
1B) electromagnetic relay.
Referring to Fig. 1, please see the measuring-signal path, the microwave signal that microwave bulk-effect oscillator (1) sends is divided into two-way by the T connector (2) of waveguide, one road signal enters antenna box (12) through isolator (4) and waveguide bend (6), be transmitted into the antenna box space by emitting antenna (7), the signal that receiving antenna (9) is received is delivered to microwave detector D
1(10), wave detector D
1The voltage of output is delivered to signal processor (13); Another road signal directly arrives microwave detector D through isolator (3)
2(5), wave detector D
2The voltage of output is also delivered to signal processor (13), and signal processor mainly carries out division and subtraction to two paths of signals, delivers to display (27) then and shows.
Integrator and get grey time marker by getting grey button (28) control, when getting grey button (28) when pressing, a negative-going pulse triggers two monostables (16) (19) simultaneously, drive excitatory amplifier (23) (17) simultaneously by logical circuit, make the length of relay (30) open the closing of contact, the long closed contact A of relay (31) opens and grows and open contact B closure, and integrator begins integration; Contact by the automatic upset pilot relay (30) of monostable (19) restores to the original state, and promptly controls the integral time of integrator, by the contact B of relay (31) integral voltage is kept; Automatic upset by monostable (16) makes lamp (25) shinny through driving stage (24), promptly be to get ash to open the beginning constantly, meanwhile make the AB contact of relay (31) recover original state through overexcitation amplifier (17), trigger simultaneously monostable (19) again, the lamp of being got the lasting lamp of ash by the control of overturning automatically the second time of monostable (19) goes out constantly, promptly is to get grey the termination constantly.The bright time of the integral time of integrator and lamp (25) equates, monostable (16) from the time that is triggered to automatic upset be the ash discharging hole required time of flying dust from flying dust pipeline (8) to lock gas ash ejector.
Claims (3)
1, microwave carbonmeter, constitute by flying dust path and measuring-signal path intersection, the measuring-signal path comprises microwave generator (1), and isolator (3) (4), antenna box (12), microwave detector (5) (10), signal processor (13) and display (27) is characterized in that:
A) the measuring-signal path is set up the T connector that a signal with microwave generator output is divided into the waveguide of two-way.
B) comprise one to microwave detector D in the signal processor (13)
1(10) and D
2(5) divider circuit that is divided by of Shu Chu voltage.
2, microwave carbonmeter is made of flying dust path and measuring-signal path intersection, and the two-way cross unit is antenna box (12), comprises microwave detector (5) (10) in the measuring-signal path, it is characterized in that:
A) inwall of antenna box (12) has the microwave absorbing material (11) of rubber or plastics filling graphite,
B) microwave detector adopts the wide-band microwave wave detector.
3, microwave carbonmeter is characterized in that: set up the integrator circuit of dynamic scaling and get grey time marker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86102183 CN86102183A (en) | 1986-04-01 | 1986-04-01 | Microwave carbonmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86102183 CN86102183A (en) | 1986-04-01 | 1986-04-01 | Microwave carbonmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86102183A true CN86102183A (en) | 1987-10-14 |
Family
ID=4801649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86102183 Pending CN86102183A (en) | 1986-04-01 | 1986-04-01 | Microwave carbonmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86102183A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784725A (en) * | 2016-04-22 | 2016-07-20 | 中北大学 | Device and method for extracting chemical parameters in harsh environment |
| EP3339844A1 (en) * | 2016-12-21 | 2018-06-27 | DSE Test Solutions A/S | Device for determining substance parameters by means of electromagnetic waves |
-
1986
- 1986-04-01 CN CN 86102183 patent/CN86102183A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784725A (en) * | 2016-04-22 | 2016-07-20 | 中北大学 | Device and method for extracting chemical parameters in harsh environment |
| EP3339844A1 (en) * | 2016-12-21 | 2018-06-27 | DSE Test Solutions A/S | Device for determining substance parameters by means of electromagnetic waves |
| WO2018113879A1 (en) * | 2016-12-21 | 2018-06-28 | Dse Test Solutions A/S | Device for determining substance parameters by means of electromagnetic waves |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4346383A (en) | Checking the location of moving parts in a machine | |
| GB1289600A (en) | ||
| EP0068994A3 (en) | Method of testing with computers | |
| CN86102183A (en) | Microwave carbonmeter | |
| CN86201833U (en) | Microwave carbon detector | |
| JPS6486032A (en) | Optical fiber evaluator | |
| Kompa | Extended time sampling for accurate optical pulse reflection measurement in level control | |
| JPS5468648A (en) | Axial direction aligner of optical fibers | |
| CN2244191Y (en) | Sensor for boiler flying ash carbon measuring instrument | |
| SU1666974A1 (en) | Measurer for moduli of reflection and transfer coefficients | |
| SU987399A1 (en) | Bell-type discrete dynnic plant for gas consumption precise production and measuring | |
| JPS5761960A (en) | Measuring device for directivity of antenna | |
| RU2054695C1 (en) | Device for estimation of state of atmosphere | |
| JPS54121752A (en) | Method of aligning optical axes of semiconductor laser and optical transmission path and apparatus for the same | |
| SU734573A1 (en) | Automatic change-over switch of subranges of multithreshold devices | |
| JPS646722A (en) | Detection system for automobile current position | |
| JPS5753658A (en) | Nondestructive inspection device | |
| JPS5596473A (en) | Speed detector | |
| JPS5551391A (en) | Time counter | |
| JPS54106185A (en) | Radar test signal generator | |
| JPS5575622A (en) | Meter for muddy boundary | |
| SU1363037A1 (en) | Microwave meter of humidity content of dielectric materials | |
| Lopez-Lapena et al. | Modified interferential method for locating coaxial cable faults | |
| JPS5311073A (en) | Phase constant measuring method | |
| SU1216064A2 (en) | Device for checking occupation of switch sections of gravity humps |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |