CN103852593A - Method for monitoring drifting of wind speed measurement unit - Google Patents
Method for monitoring drifting of wind speed measurement unit Download PDFInfo
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- CN103852593A CN103852593A CN201210501396.9A CN201210501396A CN103852593A CN 103852593 A CN103852593 A CN 103852593A CN 201210501396 A CN201210501396 A CN 201210501396A CN 103852593 A CN103852593 A CN 103852593A
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Abstract
The invention, which belongs to the technical field of the biohazard safety equipment, discloses a method for monitoring drifting of a wind speed measurement unit. According to the invention, no less than two wind speed measurement units are used for simultaneously measuring a wind speed of a same position in biohazard safety equipment. A phenomenon of inaccurate measurement of a single wind speed measurement unit due to drifting of the unit itself can be monitored; and thus the user is informed of a potential safety risk exist that the current wind speed measurement unit output value is not reliable any more and needs to be calibrated or replaced again. Therefore, the risk of inaccurate measurement caused by drifting of a single wind speed sensor can be reduced; the opportunity of pollution of the user and the experiment sample can be reduced; and thus the security coefficient of biohazard safety equipment operation can be enhanced.
Description
Technical field
The present invention relates to Biohazard Safety Equipment technical field, be specifically related to a kind of method of monitoring the drift of measuring wind speed unit.
Background technology
Biohazard Safety Equipment is to prevent the air purification safety feature that contains harmfulness or the dissipation of unknown gasoloid in operating process; this device can filter contaminated workspace air by special filtration channel; avoid human and environment to work the mischief; it is a kind of safe microorganism specialized equipment; can be applicable to the relevant industries such as biology laboratory, health care, bio-pharmaceuticals; to improving process conditions, the healthy of protection operator all has a good result.
The negative-pressure air-flow that general Biohazard Safety Equipment inwardly sucks from front window gathering hole by centrifugal blower is in order to protect personnel's safety; The down current filtering through high efficiency particulate air filter is in order to protect safety and the cross pollution of product; It is in order to protect the environment from pollution that gas stream of pollution filters through high efficiency particulate air filter.The flow velocity that Biohazard Safety Equipment flows into down current in the flow velocity of air-flow and cabinet to front window has strict requirement, can not be too low can not be too high, otherwise can not play the effect of protection personnel and laboratory sample.Wind speed measuring device all should be equipped with according to national standard Biohazard Safety Equipment, when measure flow into or decline wind speed is too low or too high and alarm.Because hot type principle wind speed measuring circuit is higher to small wind speed sensitivity, measuring accuracy, movement-less part, anti-vibration, response time be short, therefore in most cases Biohazard Safety Equipment adopts hot type principle wind speed measuring circuit.But shortcoming is to be subject to the impact of external environment factor zero point drift and measuring error occur.
Existing wind speed measuring circuit all only adopts a heating unit, and this heating unit is heated to above some values of environment temperature, when air-flow produces thermal losses by this heating unit later, measures the flow velocity of air-flow by calculating thermal losses degree.But being easily subject under the combined influence of the effects such as temperature, humidity, pressure, device aging, independent heating unit make the wind speed of measuring depart from actual wind speed, may cause when actual wind speed is too low or fail to send alerting signal when too high, user may be under unsafe state.
Summary of the invention
Primary and foremost purpose of the present invention is just to overcome the existing deficiency of existing safety cabinet wind speed measuring unit, thereby provide a kind of method of monitoring the drift of measuring wind speed unit, the method can be monitored out single measuring wind speed unit and be caused the inaccurate situation of measuring by self drifting about, prompting user has potential security risk, when measuring wind speed unit output valve, unreliable needs recalibrated or changes, the present invention can reduce because single air velocity transducer drift causes the inaccurate risk of measuring wind speed, reduce the chance that user and laboratory sample may be polluted, safety coefficient while increasing Biohazard Safety Equipment operation.The method of monitoring measuring wind speed of the present invention unit drift, employing is no less than two measuring wind speed unit measures the wind speed of same position in Biohazard Safety Equipment simultaneously, monitors single measuring wind speed unit and causes by self drift the inaccurate situation of measuring by calculating the output valve of each measuring unit.
The method of monitoring measuring wind speed of the present invention unit drift, adopts the wind speed that is no less than two measuring wind speed unit and measures simultaneously same position in Biohazard Safety Equipment.
When described measuring wind speed element number is n, and n is more than or equal to 2, and concrete steps of the present invention are: the first step, calibration measuring wind speed unit:
The signal averaging of each measuring wind speed unit of first sampling is used for calculating reference value V1;
N measuring wind speed unit, the first wind speed unit produces signal as main signal, and the second measuring wind speed unit to the n measuring wind speed cell signal is monitor signal;
When described reference value V1 is calibration, the mean value of first signal deducts the difference value of trying to achieve after the mean value of all the other 2～n signals.
Second step, beginning measuring wind:
Mean value to each signal in first cycle T averages sampling, then the mean value that calculates first signal deducts the difference value V2 trying to achieve after the mean value of all the other signals, V2 and V1 is done to difference again and calculate, and result of calculation is V3;
The 3rd step, by the threshold value Vg comparison of V3 and setting, if V3 does not exceed threshold value Vg, by abnormality mark reset, according to the normal calculation of wind speed value of main signal; If V3 has exceeded threshold value Vg, put an abnormality mark;
The 4th step, deduct at the next sampling period T mean value that average sample is calculated a first signal again again the difference value V2 trying to achieve after the mean value of all the other signals, V2 and reference value V1 do difference again and calculate, and result of calculation is V3;
The 5th step, again by V3 and threshold value Vg comparison, if V3 does not exceed threshold value Vg, the abnormality mark position of last time reset, according to the normal calculation of wind speed value of main signal; If V3 has exceeded threshold value Vg, keep abnormality mark, and judge that signal is mistake, inaccurate by the alarm unit air speed value that signal points out user now to measure that gives the alarm, there is security risk in system, need to take corresponding measure and recalibrate wind speed measuring circuit.
Described threshold value Vg obtains 50% ~ 150% of difference value according to the first signal mean value of measuring wind speed unit and the second measuring wind speed unit to the n measuring wind speed cell signal mean value.
Threshold value Vg can not establish to such an extent that too lowly cause frequent wrong report, can not establish get Tai Gao so that monitoring loses meaning.
The absolute value of the difference that when described reference value V1 is calibration, the mean value calculation of first signal and all the other signals obtains, the mean value of first signal is as main signal, the mean value of all the other signals is as monitor signal, the benefit that adopts the absolute value of the difference influence of fluctuations of measured wind speed that has been cancellation itself;
First signal of the present invention and 2nd～n signal are to monitor mutually, no matter be that first signal value changes or 2nd ~ n signal value output changes and exceeded continuously one within a time cycle and presets threshold value, main control unit all can be pointed out measuring wind speed unit exception, send alerting signal, alert has potential security risk, when measuring wind speed unit output valve, unreliable needs recalibrated or changes, the present invention can reduce because single air velocity transducer drift causes the inaccurate risk of measuring wind speed, reduce the chance that user and laboratory sample may be polluted, safety coefficient while increasing Biohazard Safety Equipment operation.
Accompanying drawing explanation
Fig. 1 is the program main flow chart of embodiment 1.
Fig. 2 is the program flow diagram of the first step calibration of embodiment 1.
Fig. 3 is the program main flow chart of embodiment 2.
Fig. 4 is the program flow diagram of the first step calibration of embodiment 2.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.Should be understood that following examples are only for the present invention is described but not for limiting scope of the present invention.
Embodiment 1:
As depicted in figs. 1 and 2, a kind of method of monitoring the drift of measuring wind speed unit of the present invention, employing is no less than two measuring wind speed unit measures the wind speed of same position in Biohazard Safety Equipment simultaneously, monitors single measuring wind speed unit and causes by self drift the inaccurate situation of measuring by calculating the output valve of each measuring unit.
In the time that measuring wind speed of the present invention unit is 2, concrete steps of the present invention are:
The first step, calibration measuring wind speed unit:
First signal mean value and the secondary signal mean value that the first measuring wind speed unit and the second measuring wind speed unit export respectively of first sampling obtains reference value V1;
Described reference value V1 is when calibration first signal and the difference value that calculates of secondary signal, and first signal is as main signal, and secondary signal is as monitor signal, the benefit that the adopts difference value influence of fluctuations of measured wind speed that has been cancellation itself;
Second step, beginning measuring wind:
In first cycle T, first signal value and secondary signal value are averaged to sampling, then calculate the difference value V2 of first signal and secondary signal; Difference value V2 and reference value V1 are done to difference calculating again, and result of calculation is V3;
The 3rd step, by the threshold value Vg comparison of V3 and setting, if V3 does not exceed threshold value Vg, abnormality mark is resetted, normal calculation of wind speed value; If V3 has exceeded threshold value Vg, put an abnormality mark;
The 4th step, next sampling period T more again average sample calculate the difference value V2 of first signal and secondary signal, and reference value V1 does difference again and calculates, result of calculation is V3;
The 5th step, again by V3 and threshold value Vg comparison, if V3 does not exceed threshold value Vg, the abnormality mark position of last time resets, normal calculation of wind speed value; If V3 has exceeded threshold value Vg, keep abnormality mark, and judge that signal is mistake, sends alerting signal alert.
Embodiment 2:
As shown in Figure 3 and Figure 4, when described measuring wind speed element number is n, and n is greater than 2, and concrete steps of the present invention are:
The first step, calibration measuring wind speed unit:
The signal averaging of each measuring wind speed unit of first sampling is used for calculating reference value V1;
N measuring wind speed unit, the first measuring wind speed cell signal is as main signal, second to the signal of n measuring wind speed unit be monitor signal;
When described reference value V1 is calibration, the mean value of first signal deducts the difference value of trying to achieve after the mean value of all the other 2～n signals.
Second step, beginning measuring wind:
Mean value to each signal in first cycle T averages sampling, then the mean value that calculates first signal deducts the difference value V2 trying to achieve after the mean value of all the other signals, V2 and V1 is done to difference again and calculate, and result of calculation is V3;
The 3rd step, by the threshold value Vg comparison of V3 and setting, if V3 does not exceed threshold value Vg, by abnormality mark reset, according to the normal calculation of wind speed value of main signal; If V3 has exceeded threshold value Vg, put an abnormality mark;
The 4th step, deduct at the next sampling period T mean value that average sample is calculated a first signal again again the difference value V2 trying to achieve after the mean value of all the other signals, V2 and reference value V1 do difference again and calculate, and result of calculation is V3;
The 5th step, again by V3 and threshold value Vg comparison, if V3 does not exceed threshold value Vg, the abnormality mark position of last time reset, according to the normal calculation of wind speed value of main signal; If V3 has exceeded threshold value Vg, keep abnormality mark, and judge that signal is mistake, inaccurate by the alarm unit air speed value that signal points out user now to measure that gives the alarm, there is security risk in system, need to take corresponding measure and recalibrate wind speed measuring circuit.
Described threshold value Vg obtains 50% ~ 150% of difference value according to the first signal mean value of measuring wind speed unit and the second measuring wind speed unit to the n measuring wind speed cell signal mean value.
Threshold value Vg can not establish to such an extent that too lowly cause frequent wrong report, can not establish get Tai Gao so that monitoring loses meaning.
The absolute value of the difference that when described reference value V1 is calibration, the mean value calculation of first signal and all the other signals obtains, the mean value of first signal is as main signal, the mean value of all the other signals is as monitor signal, the benefit that adopts the absolute value of the difference influence of fluctuations of measured wind speed that has been cancellation itself;
First signal of the present invention and 2nd～n signal are to monitor mutually, no matter be that first signal value changes or 2nd ~ n signal value output changes and exceeded continuously one within a time cycle and presets threshold value, main control unit all can be pointed out measuring wind speed unit exception, send alerting signal, alert has potential security risk, when measuring wind speed unit output valve, unreliable needs recalibrated or changes, the present invention can reduce because single air velocity transducer drift causes the inaccurate risk of measuring wind speed, reduce the chance that user and laboratory sample may be polluted, safety coefficient while increasing Biohazard Safety Equipment operation.
Claims (3)
1. a method of monitoring measuring wind speed unit drift, is characterized in that, adopts the wind speed that is no less than two measuring wind speed unit and measures simultaneously same position in Biohazard Safety Equipment.
2. the method for monitoring measuring wind speed as claimed in claim 1 unit drift, is characterized in that, when described measuring wind speed element number is n, and n is more than or equal to 2, and concrete steps of the present invention are:
The first step, calibration measuring wind speed unit:
The signal averaging of each measuring wind speed unit of first sampling is used for calculating reference value V1;
N measuring wind speed unit, the first wind speed unit produces signal as main signal, and the second measuring wind speed unit to the n measuring wind speed cell signal is monitor signal;
When described reference value V1 is calibration, the mean value of first signal deducts the difference value of trying to achieve after the mean value of all the other 2～n signals.
Second step, beginning measuring wind:
Mean value to each signal in first cycle T averages sampling, then the mean value that calculates first signal deducts the difference value V2 trying to achieve after the mean value of all the other signals, V2 and V1 is done to difference again and calculate, and result of calculation is V3;
The 3rd step, by the threshold value Vg comparison of V3 and setting, if V3 does not exceed threshold value Vg, by abnormality mark reset, according to the normal calculation of wind speed value of main signal; If V3 has exceeded threshold value Vg, put an abnormality mark;
The 4th step, deduct at the next sampling period T mean value that average sample is calculated a first signal again again the difference value V2 trying to achieve after the mean value of all the other signals, V2 and reference value V1 do difference again and calculate, and result of calculation is V3;
The 5th step, again by V3 and threshold value Vg comparison, if V3 does not exceed threshold value Vg, the abnormality mark position of last time reset, according to the normal calculation of wind speed value of main signal; If V3 has exceeded threshold value Vg, keep abnormality mark, and judge that signal is mistake, inaccurate by the alarm unit air speed value that signal points out user now to measure that gives the alarm, there is security risk in system, need to take corresponding measure and recalibrate wind speed measuring circuit.
3. the method for monitoring measuring wind speed as claimed in claim 2 unit drift, it is characterized in that, described threshold value Vg obtains 50% ~ 150% of difference value according to the first signal mean value of measuring wind speed unit and the second measuring wind speed unit to the n measuring wind speed cell signal mean value.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034098A (en) * | 2007-02-02 | 2007-09-12 | 上海力申科学仪器有限公司 | Automatic zero correction method for bio-safety cabinet wind speed sensing device |
| CN101053851A (en) * | 2006-02-09 | 2007-10-17 | 林向前 | Biological safety cabinet |
| JP2008200671A (en) * | 2008-02-04 | 2008-09-04 | Hitachi Industrial Equipment Systems Co Ltd | Safety cabinet |
| JP2010159938A (en) * | 2009-01-09 | 2010-07-22 | Hitachi Industrial Equipment Systems Co Ltd | Total exhaust type safety cabinet |
| CN202305556U (en) * | 2011-10-14 | 2012-07-04 | 北京东联哈尔仪器制造有限公司 | Wind speed sensor applied in biological safety cabinet body |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101053851A (en) * | 2006-02-09 | 2007-10-17 | 林向前 | Biological safety cabinet |
| CN101034098A (en) * | 2007-02-02 | 2007-09-12 | 上海力申科学仪器有限公司 | Automatic zero correction method for bio-safety cabinet wind speed sensing device |
| JP2008200671A (en) * | 2008-02-04 | 2008-09-04 | Hitachi Industrial Equipment Systems Co Ltd | Safety cabinet |
| JP2010159938A (en) * | 2009-01-09 | 2010-07-22 | Hitachi Industrial Equipment Systems Co Ltd | Total exhaust type safety cabinet |
| CN202305556U (en) * | 2011-10-14 | 2012-07-04 | 北京东联哈尔仪器制造有限公司 | Wind speed sensor applied in biological safety cabinet body |
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