CN2347156Y

CN2347156Y - Gas density precision detecting and controlling device

Info

Publication number: CN2347156Y
Application number: CN 97243357
Authority: CN
Inventors: 顾福元; 宫一中; 唐和森
Original assignee: Purple Mountain Observatory of CAS
Current assignee: Purple Mountain Observatory of CAS
Priority date: 1997-12-30
Filing date: 1997-12-30
Publication date: 1999-11-03
Anticipated expiration: 2007-12-30

Abstract

The utility model relates to a gas density precision detecting and controlling device. Quantitative gases are filled into a seal standard container under normal temperature; a pressure sensor is adopted to detect out the pressure of the standard container and the pressure of a detecting container respectively and then the both values of the pressure are compared; thus, the seal value of the gas density is obtained; the autocontrol can be achieved by that the valve is controlled by the value; the concrete devices of the utility model are that the positions of the standard container and the detecting container are provided with the pressure sensor respectively; the outputs of the pressure sensors are connected with an amplifying circuit respectively; the two amplifying circuit are connected with a comparator at the same time and then connected with a control circuit. The utility model can eliminate the influence of the detecting result caused by temperature change; thus, the precision detecting and the automatic control of the gas density is achieved.

Description

The accurate Detection ﹠ Controling device of gas density

The utility model relates to the accurate Detection ﹠ Controling device of a kind of gas density.

In technical fields such as space exploration, gas analysis and Chemical Manufacture, often need the density of gas be detected.Prior art generally is to use pressure transducer measurement gas pressure, promptly at the tested container place pressure transducer is set, and the output of sensor connects amplifying circuit, to obtain pressure value.And the pressure of gas and its temperature have functional relation, and Temperature numerical will obtain the gas density value in continuous variation, the essential temperature factor of getting rid of.Be that pressure survey numerical value must just can draw the density value of gas according to after the variation of temperature reduction.This device can't directly record gas density, therefore, is difficult to realize automatic control.Particularly at space industry, the spaceborne X ray gas detector of artificial satellite for example, the variation of its gas density will influence the result who measures power spectrum; Its operating ambient temperature is big dynamic change between-30-+50.With this understanding, traditional measurement mechanism can't be realized precision measurement and control automatically.

Task of the present utility model provides a kind of new equipment that utilizes pressure transducer measurement gas density, it should be able to get rid of the influence of temperature variation to measurement result automatically, is implemented in precision measurement of (for example space environment) gas density under the extreme environment and control automatically.

The technical scheme of finishing the foregoing invention task is as follows; Same as the prior art, the place is provided with pressure transducer at tested container, and the output of sensor connects amplifying circuit, it is characterized in that; Be provided with a volumetric standard, at the volumetric standard place same pressure transducer be set, its output connects amplifying circuit, and two amplifying circuits insert a comparator circuit simultaneously.The output of comparator circuit can directly be converted into the density value of tested gas.When needing control automatically, with the output Access Control circuit of comparer, the output of control circuit connects the driving mechanism of valve between tested container and the source of the gas, can realize automatic control.When environment temperature changes, will cause the variation of volumetric standard cell pressure signal, make datum mark become a temperature variant curve.With this curve is benchmark, and the change curve of check and correction tested container pressure signal has promptly deducted temperature factor, thereby obtained the density value of gas in the tested container.Here said volumetric standard is an airtight container, should be in the equivalent environment with tested container, particularly should be on the same isotherm.The gas of two containers dress is preferably identical, but so long as all be in absolute gaseous state, different gas also can use.The driving mechanism of said here amplifying circuit, comparator circuit, control circuit and valve all can adopt circuit of the prior art and driving mechanism.

The device that the utility model provides, overcome the deficiency of legacy equipment with pressure transducer measurement gas density, the influence of temperature variation can be got rid of automatically, precision measurement of (for example space environment) gas density under the extreme environment and control automatically can be implemented in measurement result.This programme also has application prospect in chromatogram, mass spectrometric measurement field except that using in space technology.

Now be described further with embodiment in conjunction with the accompanying drawings.

Fig. 1 is embodiment 1 a principle of work block scheme;

Fig. 2 is this apparatus structure synoptic diagram.

Embodiment 1, and the gas density control of spaceborne soft x-ray detector is with reference to Fig. 1, Fig. 2; Tested container is the cavity 1 of soft x-ray detector, all be filled with isobutane gas in it and the volumetric standard 2, at volumetric standard and cavity place pressure transducer 3-1,3-2 are set respectively, the output of two sensors meets amplifying circuit 4-1,4-2 respectively, two amplifying circuits insert a voltage comparator circuit 5 simultaneously, according to the output of comparator circuit, can draw the density value of tested gas.With this numerical value Access Control circuit 6,, can realize automatic control in order to the valve 7 between control detector cavity 1 and the source of the gas 8.

Claims

1, the accurate Detection ﹠ Controling device of a kind of gas density, the place is provided with pressure transducer at tested container, and the output of sensor connects amplifying circuit, it is characterized in that; Be provided with a volumetric standard, at the volumetric standard place same pressure transducer be set, its output connects amplifying circuit, and two amplifying circuits insert a comparator circuit simultaneously.

2, according to the accurate Detection ﹠ Controling device of the described gas density of claim 1, it is characterized in that; With the output Access Control circuit of comparer, the output of control circuit connects the driving mechanism of valve between tested container and the source of the gas.