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Negative ion collector, and negative ion concentration detection device, detection method and detector

A negative ion concentration and detection device technology, which is applied in the fields of meteorology and environmental monitoring, can solve the problems of detection accuracy defects, achieve accurate display, eliminate edge effects, and realize the effect of miniaturization

Pending Publication Date: 2021-10-29
北京清博益康科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the detection accuracy of traditional negative ion detectors that ignore the edge effect is flawed

Method used

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  • Negative ion collector, and negative ion concentration detection device, detection method and detector
  • Negative ion collector, and negative ion concentration detection device, detection method and detector
  • Negative ion collector, and negative ion concentration detection device, detection method and detector

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Experimental program
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Effect test

Embodiment 1

[0110] like Figure 5 Shown, be the structural representation of negative ion concentration detector of the present invention, comprise negative ion concentration detection device and display screen of the present invention, negative ion concentration detection device comprise negative ion collector 1, I / V conversion circuit 2, signal amplifying circuit 3, A / D sampling circuit 4 , MCU processor 5 , polarization voltage regulation circuit 6 and voltage source circuit 7 .

[0111] The schematic diagram of the negative ion collector components is as follows: Image 6 , 7 ,8. The shield front cover 101 and the shield rear cover 102 of the negative ion collector are closed by buckles. The front shield cover 101 is provided with a ventilating circular hole array 1011 on the shield front cover and the shield rear cover 102 is provided with a ventilating square hole 1021 for the air sucked by the fan. When air negative ions are sucked into the negative ion collector 1 by the fan ...

Embodiment 2

[0114] As shown in the first embodiment, the I / V conversion circuit 2 adopts an integrating circuit, that is, a low-capacity capacitor (100 pF) is selected as the charge to convert the voltage value. which is:

[0115]

[0116] The I / V conversion circuit of the embodiment adopts relatively mature integration circuit technology and high precision, but in order to ensure the precision, it is necessary to select an operational amplifier with high input impedance.

[0117] In this implementation example, the I / V conversion circuit 2 can be directly amplified by transimpedance, that is, the bridged capacitor is replaced with a large resistor to realize I / V conversion.

[0118] U=-R*I (9)

[0119] This implementation case can avoid the integral error caused by the input offset voltage of the op amp, the input bias current and the offset current, and also avoid the error caused by the leakage current of the capacitor. However, the precision requirements for resistors and operati...

Embodiment 3

[0121] Assume that the mobility to be read is 1.0 (cm 2 / V*s),0.4(cm 2 / V*s), 0.2(cm 2 / V*s) the negative ion concentrations are ρ 1 ,ρ 2 ,ρ 3 . Fan air volume V f =40cm 3 / s; the distance d=2cm between the collecting plate and the polarizing plate; the length L of the collecting plate along the wind speed direction=4.5cm; the width of the air inlet interface H=4.5cm; the migration speed V of negative ions along the wind direction L =V f / (d*H)=4.44cm / s; according to equation (2), the required polarization voltage (U 1 ,U 2 ,U 3 ,) are 3.951V, 9.875V, 19.753V respectively.

[0122] Assumed polarization voltage U 1 ,U 2 ,U 3 Next, the converted negative ions generate a total current I 1 , I 2 , I 3 1.384*10 respectively -12 A, 1.538*10 -12 A, 1.602*10 -12 a.

[0123] Then, according to equation (7), the following equations can be obtained:

[0124]

[0125] Solving, can get

[0126] ρ 1 =20*10 4 ; ρ 2 =3*10 4 ; ρ 1 =2*10 4 .

[0127] To sum up, ...

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Abstract

The invention provides a negative ion collector, a negative ion concentration detection device, a negative ion concentration detection method and a negative ion concentration detector. The negative ion concentration detection device comprises the negative ion collector, wherein a collection plate of the negative ion collector is electrically connected with a polarization voltage circuit module capable of generating polarization voltage with gradient change through external interfaces, the negative ion collector is electrically connected with the polarization voltage circuit module capable of generating polarization voltage with gradient change, a conversion relation between the polarization voltage and corresponding collection current is found through step change of the polarization voltage, a multivariate linear equation set between the polarization voltage and the corresponding current is established, and the solution of the equation set is the negative ion concentration value of the corresponding mobility. The invention further provides the negative ion collector, the collection plate and a polarization plate are respectively fixed on an upper insulating base surface and a lower insulating base surface, and the collection plate and the polarization plate are symmetrically arranged in parallel up and down; the external interfaces are respectively integrated on the collection plate and the polarization plate, and extend out of closed upper and lower insulating bases via through holes; and fans are fixed on the cross sections of the upper and lower insulating bases.

Description

technical field [0001] The invention relates to the field of meteorological and environmental monitoring, in particular to a precise negative ion detection device, detection method and detection instrument for specifying multiple mobility. Background technique [0002] Air negative oxygen ions are called "air vitamins", which have the functions of sterilizing, reducing dust, cleaning the air, improving immunity, and regulating the balance of human body functions, and play an important role in improving the atmospheric environment. [0003] Air negative ion concentration is an important criterion for judging air quality, and it is also an important indicator for the quality appraisal of negative ion generator products currently on the market. The traditional negative ion concentration detector is based on the capacitive ion collector to measure the current formed by negative ions at both ends of the collecting plate, and convert it according to the relationship between the cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
CPCG01N27/00
Inventor 林金明林峻廷林海锋刘黎兵林洪盛
Owner 北京清博益康科技有限公司