CN105424567A - Dust measurement device based on resonance theory - Google Patents
Dust measurement device based on resonance theory Download PDFInfo
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- CN105424567A CN105424567A CN201510837856.9A CN201510837856A CN105424567A CN 105424567 A CN105424567 A CN 105424567A CN 201510837856 A CN201510837856 A CN 201510837856A CN 105424567 A CN105424567 A CN 105424567A
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- resistance
- pin pipe
- operational amplifier
- auxiliary magnet
- connects
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H13/00—Measuring resonant frequency
Abstract
The invention relates to a dust measurement device based on a resonance theory. An oscillation tube fixing base is located in the center of a metal base, and an oscillation tube (4) is connected to the oscillation tube fixing base; a fixed stand column I and a fixed stand column II are connected to the symmetric positions, located at the two sides of the oscillation tube (4), of the surface of the metal base respectively, an oscillation driver (3) is fixed to the fixed stand column I, a frequency probe (8) is fixed to the fixed stand column II, an auxiliary magnet I (6) and an auxiliary magnet II (7) are connected to the oscillation tube (4) , the oscillation driver is connected with a power driving source (2) through a signal line, and the frequency probe (8) is connected with a signal processor (9) through a signal line. The dust measurement device is used for measuring dust.
Description
Technical field
Invention relates to a kind of dust measurement device based on resonance theory.
Background technology
Dust (Dust) refers to the aerial solia particle that suspends, and the particulate that particle diameter is less than 75 μm is all classified as dust.Dust is the same with other materials has certain energy.Because the particle diameter of dust is little, surface area is large, thus its surface energy also increases.Dust after burning, oxidation reaction is very rapid, and the heat that it produces can pass to adjacent dust very soon, thus causes a series of chain reaction.Such as flour mill, dust concentration reaches finite concentration, can blast if run into machine electric leakage generation electric spark.
Summary of the invention
The object of invention is to provide a kind of dust measurement device based on resonance theory, natural frequency mainly according to oscillating balance is consistent with the driving frequency of magnet steel, make oscillating balance with the certain hunting of frequency of certain amplitude of oscillation, the filtration membrane that air-flow flows through balance can make the quality of balance change thus change the oscillation frequency of balance.
above-mentioned object is realized by following technical scheme:
Based on a dust measurement device for resonance theory, its composition comprises: equipment supporter 1, motive drive source 2, oscillatory driver 3, oscillating tube 4, dust filter membrane 5, auxiliary magnet I 6, auxiliary magnet II 7, frequency probe 8, signal processor 9; Described equipment supporter 1 comprises metab, vertical columns I, vertical columns II and oscillating tube holder, and described oscillating tube 4, described dust filter membrane 5, auxiliary magnet I 6 and auxiliary magnet II 7 form oscillating balance;
Described oscillating tube fixed seating is in the center of described metab, described oscillating tube holder connects described oscillating tube 4, the surperficial symmetric position of the metab of described oscillating tube 4 both sides connects respectively described vertical columns I and described vertical columns II, described vibration is driven device 3 and is fixed on vertical columns I, described frequency probe 8 is fixed on vertical columns II, described auxiliary magnet I 6 is all connected on described oscillating tube 4 with described auxiliary magnet II 7, described oscillatory driver connects motive drive source 2 by signal wire, described frequency probe 8 is by signal wire connection signal processor 9.
The described dust measurement device based on resonance theory, described oscillating tube 4 is cone, described auxiliary magnet I 6 is positioned at the top of described auxiliary magnet II 7, and described auxiliary magnet I 6 is positioned at described auxiliary magnet II 7 and is annular and is fixed on the same center of circle.
The described dust measurement device based on resonance theory, the described vibration distance of driving between device 3 and described auxiliary magnet II 7 is 1mm ~ 5mm, and device 3 and described auxiliary magnet II 7 horizontal alignment are driven in described vibration.Described auxiliary magnet I 6 is positioned at for 40mm ~ 70mm place above auxiliary magnet II 7, and described auxiliary magnet I 6 and described frequency pop one's head ins 8 at a distance of being 1mm ~ 5mm, and described frequency is popped one's head in 8 and described auxiliary magnet I 6 horizontal alignment.
The described dust measurement device based on resonance theory, described frequency probe is made up of Hall element and signal conditioning circuit, described signal conditioning circuit comprises amplification and filtering circuit, described Hall element comprises Hall element, the pin pipe 1 resistance in series R1 of described Hall element, the pin pipe 2 resistance in series R2 of described Hall element, described resistance R1 series diode D1, described diode D1 parallel diode D2, the inverting input 2 of one end operational amplifier A 1 in parallel and one end of resistance R3 of described diode D2, the in-phase input end 3 of the other end operational amplifier A 1 in parallel of described diode D2 and resistance R4, the other end ground connection of described resistance R4, described operational amplifier A 1 also connects positive input terminal and the negative input end of the DC of direct current, the output terminal 1 of described operational amplifier A 1 connects the other end of described resistance R3 and one end of resistance R5, the described one end of the resistance R7 described in resistance R5 parallel connection and the inverting input 13 of operational amplifier A 2, one end of the in-phase input end 12 contact resistance R6 of described operational amplifier A 2, the other end ground connection of described resistance R6, described operational amplifier A 2 also connects positive input terminal and the negative input end of the DC of direct current, the output terminal 14 of described operational amplifier A 2 connects the other end of described resistance R7 and one end of resistance R8, one end of the other end parallel resistance R9 of described resistance R8 and electric capacity C1, one end of other end shunt capacitance C2 of described resistance R9 and the in-phase input end 3 of operational amplifier A 3, the other end ground connection of described electric capacity C2, the inverting input 2 of described operational amplifier A 3 connects the output terminal 1 of described operational amplifier A 3, described operational amplifier A 3 also connects positive input terminal and the negative input end of the DC of direct current, one end of the output terminal 1 series capacitance C3 of described operational amplifier A 3, one end of the other end parallel resistance R10 of described electric capacity C3 and one end of electric capacity C4, the other end ground connection of described resistance R10, one end of the other end parallel resistance R11 of described electric capacity C4 and the in-phase input end 12 of operational amplifier A 4, one end of inverting input 13 parallel resistance R12 of described operational amplifier A 4 and one end of resistance R13, the other end ground connection of described resistance R12, pin pipe 1 and the pin pipe 2 of the other end of the resistance R13 described in output terminal 14 parallel connection of described operational amplifier A 4 and header HEADER2.
The described dust measurement device based on resonance theory, described oscillatory driver 3 is push-pull type alternating electromagnet.
The described dust measurement device based on resonance theory, the pwm pulse of the characteristic frequency that MCU produces by described motive drive source 2 controls oscillatory driver by optocoupler and amplifying circuit, described pwm pulse is flowed out with pin pipe 2 by the pin pipe 1 of P1, the pin pipe 1 of described P1 and one end of pin pipe 2 resistance in series R1, the other end of described resistance R1 connects the pin pipe 3 of high speed photo coupling 6N136, the pin pipe 2 of described high speed photo coupling 6N136 connects DC voltage DC, pin pipe 3 and pin pipe 4 ground connection of described P1, the positive input terminal of the pin pipe 8 parallel connection direct voltage of described high speed photo coupling 6N136, one end of resistance R2 and the emitter e of PNP type triode Q1, one end of pin pipe 6 parallel resistance R3 of described high speed photo coupling 6N136 and the other end of resistance R2, described high speed photo coupling 6N136 obtains the input end of pin pipe 5 series direct current voltage, the base stage b of the PNP type triode Q1 described in other end connection of described resistance R3, one end of the collector c resistance in series R4 of described PNP type triode Q1, the other end of described resistance R4 connects the base stage b of NPN type triode Q2, pin pipe 2 and the pin pipe 3 of the collector c parallel diode D1 of described NPN type triode Q2 and described concussion driver, one end of the emitter e shunt inductance L1 of described NPN type triode Q2, the pin pipe 4 of described concussion driver and earth terminal, the other end of described inductance L 1 connects DC voltage DC, the pin pipe 1 of described concussion driver connects described motive drive source 2.
The described dust measurement device based on resonance theory, described signal processor 9 comprises MCU controller 9-1, signal condition element circuit 9-2, AD collecting unit 9-3, CAN interface 9-4, iic bus interface 9-5, human-computer interaction module 9-6; Described CAN interface 9-4, described iic bus interface 9-5 and described signal condition element circuit 9-2 equal transmitted in both directions wire size are to described MCU controller 9-1, described AD collecting unit 9-3 one-way transmission wire size is to described MCU controller 9-1, and described signal condition element circuit 9-2 transmitted in both directions wire size is to human-computer interaction module 9-6.
beneficial effect:
1. the wide application of invention, this series products can be applicable to mine, metallurgy, power plant, chemical industry manufacture, food processing factory, environmental protection, online environment monitoring etc.
2. the principle of inventing and structural design simply, utilize object resonance principle and conventional modulate circuit to detect the variable quantity of resonance frequency, just can realize dust concentration and detect.
3. the advance of invention is strong, and except human-computer interaction module, this invention is provided with CAN interface and iic bus, can connect host computer as required, and then realizes various man-machine interaction.
4. the structure of invention and compact, light, utilizes self-contained battery to carry out work, easy to carry and use.
accompanying drawing illustrates:
Accompanying drawing 1 is the structural representation of invention.
Accompanying drawing 2 is internal signal process flow diagrams of the signal processor of invention.
Accompanying drawing 3 is frequency probe modulate circuit figure of invention.
Accompanying drawing 4 is motive drive source circuit diagrams of invention.
embodiment:
embodiment 1
Based on a dust measurement device for resonance theory, its composition comprises: equipment supporter 1, motive drive source 2, oscillatory driver 3, oscillating tube 4, dust filter membrane 5, auxiliary magnet I 6, auxiliary magnet II 7, frequency probe 8, signal processor 9; Described equipment supporter 1 comprises metab, vertical columns I, vertical columns II and oscillating tube holder, and described oscillating tube 4, described dust filter membrane 5, auxiliary magnet I 6 and auxiliary magnet II 7 form oscillating balance;
Described oscillating tube fixed seating is in the center of described metab, described oscillating tube holder connects described oscillating tube 4, the surperficial symmetric position of the metab of described oscillating tube 4 both sides connects respectively described vertical columns I and described vertical columns II, described vibration is driven device 3 and is fixed on vertical columns I, described frequency probe 8 is fixed on vertical columns II, described auxiliary magnet I 6 is all connected on described oscillating tube 4 with described auxiliary magnet II 7, described oscillatory driver connects motive drive source 2 by signal wire, described frequency probe 8 is by signal wire connection signal processor 9.
embodiment 2
The dust measurement device based on resonance theory described in embodiment 1, described oscillating tube 4 is cone, described auxiliary magnet I 6 is positioned at the top of described auxiliary magnet II 7, and described auxiliary magnet I 6 is positioned at described auxiliary magnet II 7 and is annular and is fixed on the same center of circle.
embodiment 3
The dust measurement device based on resonance theory described in embodiment 1, the distance that described vibration is driven between device 3 and described auxiliary magnet II 7 is preferably 1mm ~ 5mm, device 3 and described auxiliary magnet II 7 horizontal alignment are driven in described vibration, it is 40mm ~ 70mm place that described auxiliary magnet I 6 is positioned at above auxiliary magnet II 7, described auxiliary magnet I 6 and described frequency pop one's head in 8 at a distance of being preferably 1mm ~ 5mm, described frequency probe 8 and described auxiliary magnet I 6 horizontal alignment.
embodiment 4
The dust measurement device based on resonance theory described in embodiment 1, described frequency probe is made up of Hall element and signal conditioning circuit, described signal conditioning circuit comprises amplification and filtering circuit, described Hall element comprises Hall element, the pin pipe 1 resistance in series R1 of described Hall element, the pin pipe 2 resistance in series R2 of described Hall element, described resistance R1 series diode D1, described diode D1 parallel diode D2, the inverting input 2 of one end operational amplifier A 1 in parallel and one end of resistance R3 of described diode D2, the in-phase input end 3 of the other end operational amplifier A 1 in parallel of described diode D2 and resistance R4, the other end ground connection of described resistance R4, described operational amplifier A 1 also connects positive input terminal and the negative input end of the DC of direct current, the output terminal 1 of described operational amplifier A 1 connects the other end of described resistance R3 and one end of resistance R5, the described one end of the resistance R7 described in resistance R5 parallel connection and the inverting input 13 of operational amplifier A 2, one end of the in-phase input end 12 contact resistance R6 of described operational amplifier A 2, the other end ground connection of described resistance R6, described operational amplifier A 2 also connects positive input terminal and the negative input end of the DC of direct current, the output terminal 14 of described operational amplifier A 2 connects the other end of described resistance R7 and one end of resistance R8, one end of the other end parallel resistance R9 of described resistance R8 and electric capacity C1, one end of other end shunt capacitance C2 of described resistance R9 and the in-phase input end 3 of operational amplifier A 3, the other end ground connection of described electric capacity C2, the inverting input 2 of described operational amplifier A 3 connects the output terminal 1 of described operational amplifier A 3, described operational amplifier A 3 also connects positive input terminal and the negative input end of the DC of direct current, one end of the output terminal 1 series capacitance C3 of described operational amplifier A 3, one end of the other end parallel resistance R10 of described electric capacity C3 and one end of electric capacity C4, the other end ground connection of described resistance R10, one end of the other end parallel resistance R11 of described electric capacity C4 and the in-phase input end 12 of operational amplifier A 4, one end of inverting input 13 parallel resistance R12 of described operational amplifier A 4 and one end of resistance R13, the other end ground connection of described resistance R12, pin pipe 1 and the pin pipe 2 of the other end of the resistance R13 described in output terminal 14 parallel connection of described operational amplifier A 4 and header HEADER2.
embodiment 5
The dust measurement device based on resonance theory described in embodiment 1 or 3, is characterized in that: described oscillatory driver 3 is push-pull type alternating electromagnet.
embodiment 6
The dust measurement device based on resonance theory described in embodiment 1, the pwm pulse of the characteristic frequency that MCU produces by described motive drive source 2 controls oscillatory driver by optocoupler and amplifying circuit, described pwm pulse is flowed out with pin pipe 2 by the pin pipe 1 of P1, the pin pipe 1 of described P1 and one end of pin pipe 2 resistance in series R1, the other end of described resistance R1 connects the pin pipe 3 of high speed photo coupling 6N136, the pin pipe 2 of described high speed photo coupling 6N136 connects DC voltage DC, pin pipe 3 and pin pipe 4 ground connection of described P1, the positive input terminal of the pin pipe 8 parallel connection direct voltage of described high speed photo coupling 6N136, one end of resistance R2 and the emitter e of PNP type triode Q1, one end of pin pipe 6 parallel resistance R3 of described high speed photo coupling 6N136 and the other end of resistance R2, described high speed photo coupling 6N136 obtains the input end of pin pipe 5 series direct current voltage, the base stage b of the PNP type triode Q1 described in other end connection of described resistance R3, one end of the collector c resistance in series R4 of described PNP type triode Q1, the other end of described resistance R4 connects the base stage b of NPN type triode Q2, pin pipe 2 and the pin pipe 3 of the collector c parallel diode D1 of described NPN type triode Q2 and described concussion driver, one end of the emitter e shunt inductance L1 of described NPN type triode Q2, the pin pipe 4 of described concussion driver and earth terminal, the other end of described inductance L 1 connects DC voltage DC, the pin pipe 1 of described concussion driver connects described motive drive source 2.
embodiment 7
The dust measurement device based on resonance theory described in embodiment 1, is characterized in that: described signal processor 9 comprises MCU controller 9-1, signal condition element circuit 9-2, AD collecting unit 9-3, CAN interface 9-4, iic bus interface 9-5, human-computer interaction module 9-6; Described CAN interface 9-4, described iic bus interface 9-5 and described signal condition element circuit 9-2 equal transmitted in both directions wire size are to described MCU controller 9-1, described AD collecting unit 9-3 one-way transmission wire size is to described MCU controller 9-1, and described signal condition element circuit 9-2 transmitted in both directions wire size is to human-computer interaction module 9-6.
embodiment 8
The dust measurement device based on resonance theory described in embodiment 1, the distance that described vibration is driven between device 3 and described auxiliary magnet II 7 is preferably 3mm, device 3 and described auxiliary magnet II 7 horizontal alignment are driven in described vibration, described auxiliary magnet I 6 is positioned at above auxiliary magnet II 7 and is preferably 55mm place, described auxiliary magnet I 6 and described frequency pop one's head in 8 at a distance of being preferably 2mm, described frequency probe 8 and described auxiliary magnet I 6 horizontal alignment.
embodiment 8
The dust measurement device based on resonance theory described in embodiment 6, described high speed photo coupling 6N136 comprises light emitting diode D2, diode D3 and NPN type triode Q3; One end of described light emitting diode D2 connects direct supply DC, the other end of the resistance R1 described in other end connection of described light emitting diode D2, one end of the resistance R2 described in the connection of one end of described diode D3, the base stage b of the NPN type triode Q3 described in other end connection of described diode D3, the emitter e of described NPN type triode Q3 connects direct supply DC, the collector c of described NPN type triode Q3, the other end of the resistance R2 described in connection.
Certainly, above-mentioned explanation is not the restriction to invention, and invention is also not limited in above-mentioned citing, the change that those skilled in the art make within the scope of essence of an invention, remodeling, interpolation or replacement, also should belong to the protection domain of invention.
Claims (7)
1. based on a dust measurement device for resonance theory, its composition comprises: equipment supporter (1), motive drive source (2), oscillatory driver (3), oscillating tube (4), dust filter membrane (5), auxiliary magnet I (6), auxiliary magnet II (7), frequency probe (8), signal processor (9); It is characterized in that: described equipment supporter (1) comprises metab, vertical columns I, vertical columns II and oscillating tube holder, described oscillating tube (4), described dust filter membrane (5), auxiliary magnet I (6) and auxiliary magnet II (7) form oscillating balance;
Described oscillating tube fixed seating is in the center of described metab, described oscillating tube holder connects described oscillating tube (4), the surperficial symmetric position of the metab of described oscillating tube (4) both sides connects respectively described vertical columns I and described vertical columns II, described vibration is driven device (3) and is fixed on vertical columns I, described frequency probe (8) is fixed on vertical columns II, described auxiliary magnet I (6) is all connected on described oscillating tube (4) with described auxiliary magnet II (7), described oscillatory driver connects motive drive source (2) by signal wire, described frequency probe (8) is by signal wire connection signal processor (9).
2. the dust measurement device based on resonance theory according to claim 1, it is characterized in that: described oscillating tube (4) is cone, described auxiliary magnet I (6) is positioned at the top of described auxiliary magnet II (7), and described auxiliary magnet I (6) is positioned at described auxiliary magnet II (7) and is annular and is fixed on the same center of circle.
3. the dust measurement device based on resonance theory according to claim 1, it is characterized in that: the distance 1mm ~ 5mm between device (3) and described auxiliary magnet II (7) is driven in described vibration, device (3) and described auxiliary magnet II (7) horizontal alignment are driven in described vibration, described auxiliary magnet I (6) is positioned at 40mm ~ 70mm place, auxiliary magnet II (7) top, described auxiliary magnet I (6) and described frequency pop one's head in (8) at a distance of 1mm ~ 5mm, described frequency probe (8) and described auxiliary magnet I (6) horizontal alignment.
4. the dust measurement device based on resonance theory according to claim 1, is characterized in that: described frequency probe is made up of Hall element and signal conditioning circuit, described signal conditioning circuit comprises amplification and filtering circuit, described Hall element comprises Hall element, the pin pipe 1 resistance in series R1 of described Hall element, the pin pipe 2 resistance in series R2 of described Hall element, described resistance R1 series diode D1, described diode D1 parallel diode D2, the inverting input 2 of one end operational amplifier A 1 in parallel and one end of resistance R3 of described diode D2, the in-phase input end 3 of the other end operational amplifier A 1 in parallel of described diode D2 and resistance R4, the other end ground connection of described resistance R4, described operational amplifier A 1 also connects positive input terminal and the negative input end of the DC of direct current, the output terminal 1 of described operational amplifier A 1 connects the other end of described resistance R3 and one end of resistance R5, the described one end of the resistance R7 described in resistance R5 parallel connection and the inverting input 13 of operational amplifier A 2, one end of the in-phase input end 12 contact resistance R6 of described operational amplifier A 2, the other end ground connection of described resistance R6, described operational amplifier A 2 also connects positive input terminal and the negative input end of the DC of direct current, the output terminal 14 of described operational amplifier A 2 connects the other end of described resistance R7 and one end of resistance R8, one end of the other end parallel resistance R9 of described resistance R8 and electric capacity C1, one end of other end shunt capacitance C2 of described resistance R9 and the in-phase input end 3 of operational amplifier A 3, the other end ground connection of described electric capacity C2, the inverting input 2 of described operational amplifier A 3 connects the output terminal 1 of described operational amplifier A 3, described operational amplifier A 3 also connects positive input terminal and the negative input end of the DC of direct current, one end of the output terminal 1 series capacitance C3 of described operational amplifier A 3, one end of the other end parallel resistance R10 of described electric capacity C3 and one end of electric capacity C4, the other end ground connection of described resistance R10, one end of the other end parallel resistance R11 of described electric capacity C4 and the in-phase input end 12 of operational amplifier A 4, one end of inverting input 13 parallel resistance R12 of described operational amplifier A 4 and one end of resistance R13, the other end ground connection of described resistance R12, pin pipe 1 and the pin pipe 2 of the other end of the resistance R13 described in output terminal 14 parallel connection of described operational amplifier A 4 and header HEADER2.
5. the dust measurement device based on resonance theory according to claim 1 or 3, is characterized in that: described oscillatory driver (3) is push-pull type alternating electromagnet.
6. the dust measurement device based on resonance theory according to claim 1, it is characterized in that: the pwm pulse of the characteristic frequency that MCU produces by described motive drive source (2) controls oscillatory driver by optocoupler and amplifying circuit, described pwm pulse is flowed out with pin pipe 2 by the pin pipe 1 of P1, the pin pipe 1 of described P1 and one end of pin pipe 2 resistance in series R1, the other end of described resistance R1 connects the pin pipe 3 of high speed photo coupling 6N136, the pin pipe 2 of described high speed photo coupling 6N136 connects DC voltage DC, pin pipe 3 and pin pipe 4 ground connection of described P1, the positive input terminal of the pin pipe 8 parallel connection direct voltage of described high speed photo coupling 6N136, one end of resistance R2 and the emitter e of PNP type triode Q1, one end of pin pipe 6 parallel resistance R3 of described high speed photo coupling 6N136 and the other end of resistance R2, described high speed photo coupling 6N136 obtains the input end of pin pipe 5 series direct current voltage, the base stage b of the PNP type triode Q1 described in other end connection of described resistance R3, one end of the collector c resistance in series R4 of described PNP type triode Q1, the other end of described resistance R4 connects the base stage b of NPN type triode Q2, pin pipe 2 and the pin pipe 3 of the collector c parallel diode D1 of described NPN type triode Q2 and described concussion driver, one end of the emitter e shunt inductance L1 of described NPN type triode Q2, the pin pipe 4 of described concussion driver and earth terminal, the other end of described inductance L 1 connects DC voltage DC, the pin pipe 1 of described concussion driver connects described motive drive source (2).
7. the dust measurement device based on resonance theory according to claim 1, is characterized in that: described signal processor (9) comprises MCU controller (9-1), signal condition element circuit (9-2), AD collecting unit (9-3), CAN interface (9-4), iic bus interface (9-5), human-computer interaction module (9-6); Described CAN interface (9-4), described iic bus interface (9-5) and described signal condition element circuit (9-2) the MCU controller (9-1) that all transmitted in both directions wire size is extremely described, described AD collecting unit (9-3) one-way transmission wire size is to described MCU controller (9-1), and described signal condition element circuit (9-2) transmitted in both directions wire size is to human-computer interaction module (9-6).
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| CN201510837856.9A CN105424567A (en) | 2015-11-26 | 2015-11-26 | Dust measurement device based on resonance theory |
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| CN201510837856.9A CN105424567A (en) | 2015-11-26 | 2015-11-26 | Dust measurement device based on resonance theory |
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| CN204101414U (en) * | 2014-09-30 | 2015-01-14 | 安徽蓝盾光电子股份有限公司 | A kind of platform for oscillating tube debugging and inspection in TEOM atmosphere particulate matter monitoring instrument |
| CN205091227U (en) * | 2015-06-30 | 2016-03-16 | 青岛众瑞智能仪器有限公司 | Vibration balance cigarette dust content direct reading measuring apparatu with reposition of redundant personnel structure |
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| US4391338A (en) * | 1980-04-04 | 1983-07-05 | Harvey Patashnick | Microbalance and method for measuring the mass of matter suspended within a fluid medium |
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Application publication date: 20160323 |