CN104101418A  Electronic analytical balance trace loading and drift discrimination method  Google Patents
Electronic analytical balance trace loading and drift discrimination method Download PDFInfo
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 CN104101418A CN104101418A CN201410289022.4A CN201410289022A CN104101418A CN 104101418 A CN104101418 A CN 104101418A CN 201410289022 A CN201410289022 A CN 201410289022A CN 104101418 A CN104101418 A CN 104101418A
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Abstract
The invention discloses an electronic analytical balance trace loading and drift discrimination method, so as to solve the technical problem of electronic analytical balance trace loading and drift. The method comprises the steps that a) temperature data output by a temperature sensor is compensated; b) zero drift amount and a sensitivity coefficient are calibrated by using the compensated temperature data; c) mass sampling data, the zero drift amount and the sensitivity coefficient are used to calculate mass; and d) according to the mass change rate, trace loading and drift are discriminated. The method provided by the invention can be used to quickly distinguish drift and loading.
Description
Technical field
The invention belongs to signal processing technology field, relate to a kind of electronic analytical balance trace and load and drift method of discrimination.
Background technology
Electronic analytical balance is a kind of high precision quality measuring instrument, is the mass metrology standard instruments that is widely used in national defence, scientific research, factory, laboratory, has the features such as weighing accuracy is high, good stability, fast response time.Operating ambient temperature changes makes balance indicating value occur slowly to change, i.e. drift phenomenon loads and is difficult to differentiation with trace in the certain hour section internal cause mass change causing of drift about.Therefore, microloading with drift method of discrimination is to realize quick, the accurate gordian technique weighing of electronic analytical balance.
Summary of the invention
In order to overcome the defect existing in prior art, when rate temperature change is very fast, drift rate of mass change may exceed microload mass rate of change, differentiates trace again and load and drift after needing first temperature to be compensated.The invention provides a kind of electronic analytical balance trace and load and drift method of discrimination, to distinguish fast drift and to load.Its technical scheme is as follows:
A kind of electronic analytical balance trace loads and drift method of discrimination, comprises the following steps:
A) temperature data of temperature sensor output is compensated;
B) utilize the temperature data after compensation to proofread and correct zero point drift amount and sensitivity coefficient;
C) utilize sampled data, zero point drift amount and sensitivity coefficient calculated mass;
D) according to the rate of change of quality, trace loading and drift are differentiated.
Preferably, described step a) middle temperature data compensates according to the direction of temperature variation, the proportional relation of relative change rate of temperature data compensation rate and quality.
Preferably, described step b) in zero point drift amount and sensitivity coefficient be the function about temperature data, can utilize the temperature data of the temperature sensor output that is placed on magnet steel inside to proofread and correct.
Preferably, described step b) in asking for of zero point drift amount and sensitivity coefficient comprise the steps: respectively 50g, 100g, 150g and 200g standard test weight to be added to unloading 10 times under 10 DEG C, 15 DEG C, 20 DEG C, 25 DEG C, 30 DEG C five temperature spots, record corresponding sampled data and be averaged, obtain five groups of average sample data under five temperature spots, ask for zero point drift amount and sensitivity coefficient.
Preferably, asking for of penalty coefficient comprises the steps: to load respectively 0g, 50g, 100g, 150g and 200g standard test weight 10min, and record the temperature data of corresponding sampled data, counterbalance mass value and temperature sensor output simultaneously, obtain the mean value that record data start sampled data, counterbalance mass value and the temperature data of 10s and last 10s most, and adopt zero point drift amount and the sensitivity coefficient of trying to achieve to ask for penalty coefficient.
Preferably, described steps d) in when in regular hour section, the rate of change of quality exceedes the ratevalve value X of setting, be determined with trace and load, otherwise be drift.
Further preferably, asking for of the ratevalve value X setting comprises the steps: respectively in the time that trace loads and drift about, the qualitative data calculating is analyzed, obtain corresponding rate of mass change, thereby determine and judge and load and drift rate of mass change threshold X, threshold X equal trace load with drift rate of mass change and half.
Beneficial effect of the present invention:
Electronic analytical balance trace of the present invention loads with drift method of discrimination can effectively suppress temperature drift, and quick and precisely differentiation trace loads and drift.
Brief description of the drawings
Fig. 1 is that the trace of one embodiment of the invention loads and drift method of discrimination process flow diagram;
Fig. 2 is typical temperature and zero point drift discharge curve;
Fig. 3 is typical load mass value upcurve.
Embodiment.
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in more detail.
Randomly draw the electronic analytical balance of different batches, then every electronic analytical balance is carried out respectively to following operation: preheating is after 3 hours, reach optimum Working, in constant temperature enclosure, load test, simultaneously sampled data (0g, 50g, 100g, 150g, 200g), the environment temperature under recording test time point, five kinds of load and be placed in magnet steel internal temperature sensor output data, loads the duration to can be 30min.Put for 0 moment as benchmark taking the test duration, calculate respectively the zero point drift amount of followup each time point with respect to reference point, taking the time as horizontal ordinate, temperature and load are ordinate, by the measurement data drafting pattern of every electronic analytical balance, its typical characteristics curve as shown in Figure 2.As can be seen from the figure, variation of ambient temperature, zero point drift amount has the regular hour to lag behind, and its delay degree is less than the hysteresis of temperature sensor output temperature data.Therefore, serviceability temperature sensor output temperature data are proofreaied and correct life period to zero point drift amount and are lagged behind, and must first compensate temperature sensor output temperature data.
Shown in Fig. 1, first, as step 10, the temperature data of temperature sensor output is compensated by formula below.
T′＝T+K[W(t
_{0})W(t
_{1})]/W(t
_{0}) (1)
W (t
_{1}) be uptodate sampled data, W (t
_{0}) be prior to t
_{1}the sampled data of time Δ t, the compensation rate of temperature data T and the relative change rate of sampled data are proportional, and K is a penalty coefficient.
Then, step 20 utilizes the temperature data T' after compensation to proofread and correct drift value p (T') and sensitivity coefficient q (T').Drift value p (T') and sensitivity coefficient q (T') are the functions about T', and wherein p (T') is directly proportional to T'
p(T')＝dT'
(2)
In formula, d is ratio constant coefficient.
Temperature variation changes the magnetic induction density of permanent magnet, magnetic induction density B when temperature is T'
_{t}for
B
_{T}＝B
_{0}(1+α
_{B}T')
(3)
In formula, B
_{0}the magnetic induction density of permanent magnet while being 0 DEG C, α
_{b}for the temperature coefficient of permanent magnet.
Temperature variation changes the length of currentcarrying movingcoil wire,, length L when temperature is T'
_{t}for
L
_{T}＝L
_{0}(1+α
_{L}T')
(4)
In formula, L
_{0}movingcoil conductor length while being 0 DEG C, α
_{l}for wire expansion coefficient.
The sensitivity coefficient that can be obtained electronic analytical balance by (3), (4) formula is
q(T')＝B
_{T}L
_{T}＝c(1+aT'+bT'
^{2}) (5)
In formula, parameter a, b, c are and the constant coefficient of permanent magnet and movingcoil parameter correlation.
Mass M is calculated by sampled data W, zero point drift amount p (T') and sensitivity coefficient q (T')
M＝q(T')[Wp(T')] (6)
Finally, step 40 is differentiated trace loading and drift according to the rate of change of quality.In the time having load to load on the scale pan, the time dependent curve of quality is the unitstep nsponse curve of highorder underdamping system, as shown in Figure 3.The rate of change of quality is larger in the curve initial stage; And after zero point drift amount and sensitivity coefficient are proofreaied and correct, temperature, drifting in certain hour section of the mass formation calculating is very little.Therefore,,,, in the time that the rate of change of quality exceedes the ratevalve value X of setting, be judged to be trace and load in regular hour section according to the difference of trace loading and drift rate of mass change by the lasting calculating to quality in moment in load man, otherwise for drifting about.
(1) zero point drift amount p (T') and sensitivity coefficient q (T') parameter are obtained by experimental technique below.
The unloaded preheating of electronic analytical balance, after 3 hours, reaches optimum Working, tests as follows:
1. in the time of 10 DEG C, mass value while measuring 10 groups of zero loads, and respectively 50g, 100g, 150g, 200g standard test weight are added to unloading 10 times, and obtain 10 inferior quality values corresponding to five kinds of loads and be averaged, obtain 0g, 50g, 100g, 150g, 200g mass average value;
2. repeat abovementioned test procedure and obtain the experimental data needing at 15 DEG C, 20 DEG C, 25 DEG C, 30 DEG C respectively.
3. taking temperature as horizontal ordinate, qualitative data is ordinate, draws respectively by least square curve fit method the curve that qualitative data M corresponding under abovementioned five kinds of different loads changes with temperature T;
4. according to formula (6), adopt least square method to obtain respectively five groups of parameter a, b under abovementioned different loads, the value of c, d.
5. as calculated, under 0g, 50g, five kinds of loads of 100g, 150g and 200g, the ratio of parameter value and the ratio of its mass value of any two groups of a, b, c, d are consistent.
Because this is in largetemperature range, the least square fitting of carrying out between each temperature spot, when each data acquisition, balance work is relatively stable, and the p (T') causing because of temperature hysteresis and q (T') error of calculation can be ignored, and now T is equivalent to T'.
(2) penalty coefficient K can be obtained by experimental technique below.
The unloaded preheating of electronic analytical balance, after 3 hours, reaches optimum Working, tests as follows:
1. unloaded 10min, the temperature data T that continues to record sampled data, mass value M and be placed in magnet steel internal temperature sensor;
2. get the mean value W of the sampled data in the front 10s of record data
_{0}, mean value W, M and the T of sampled data, mass value and temperature value in last 10s.
3. bring W, M and corresponding a, b, c and d value into formula M=c (1+aT'+bT'
^{2}) in [WdT'], obtain T', by T', T, W
_{0}and W
_{1}bring formula (1) into, obtain Proportional coefficient K.
4. loading respectively in 50g, 100g, 150g and 200g standard test weight situation, repeating abovementioned three steps, obtaining respectively K, the value of the K obtaining is consistent.
(3) judge that the threshold X loading with the data variation speed of drifting about can be obtained by experimental technique below.
In A drift situation, the experiment of measurement quality rate of change is as follows:
The unloaded preheating of electronic analytical balance, after 3 hours, reaches optimum Working, and sky is flat on to constant temperature enclosure, tests as follows:
1. unloaded 30min, continues the mass M that sampling electronic analytical balance shows, taking mass M as ordinate, time t is horizontal ordinate, draws out the curve of mass M about time t.
2. find out the maximum slope of curve, obtain the maximum rate of the mass change showing in the Δ t time.
3. load respectively 50g, 100g, 150g and 200g standard test weight, according to step 1. and 2., obtain respectively the maximum rate that corresponding mass changes.
4. by the maximal value in the maximum rate of the mass change obtaining under five kinds of load condition as drift rate of mass change X
_{1}.
Under B trace load condition, the experiment of measurement quality rate of change is as follows.
The unloaded preheating of electronic analytical balance, after 3 hours, reaches optimum Working, and sky is flat on to constant temperature enclosure, tests as follows:
1. load 1mg standard test weight, continue the mass M that sampling shows, taking mass M as ordinate, time t is horizontal ordinate, draws out the curve of mass M about time t.
2. find out the maximum slope of curve, draw the rate of change of qualitative data in loading procedure.
3. load respectively 2mg, 5mg, 10mg, 20mg standard test weight, according to step 1. and 2., obtain respectively the rate of change of corresponding loading procedure qualitative data.
4. using the minimum value in the mass value variation minimumrate obtaining under five kinds of load condition as the threshold X that loads data variation speed
_{2}.
Get and judge the threshold X=(X loading with the data variation speed of drifting about
_{2}+ X
_{1})/2, the checking of threshold X is as follows:
Get 10 electronic analytical balances that do not carry out Temperature Treatment, after preheating 3 hours, reach optimum Working, in constant temperature enclosure, load test, can checking accurately judge that in following 3 kinds of situations trace loads and drift, and ensure under microload condition display quality value fast and accurately.
1. unloaded in the situation that, load respectively 1mg, 2mg, 5mg, 10mg, five kinds of standard test weights of 20mg;
2. load respectively 10g, 20g, 50g, 100g, 200g standard test weight, then load 1mg standard test weight;
3. unloaded and load 10g, 50g, 100g, 200g standard test weight respectively, the loading duration is 30min.
Repeat abovementioned steps repeatedly, experimental result shows to get the as above threshold X of data variation speed, can fast, accurately judge that trace loads and drift.
The above; it is only preferably embodiment of the present invention; protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in, the simple change of the technical scheme that can obtain apparently or equivalence replace all fall within the scope of protection of the present invention.
Claims (7)
1. electronic analytical balance trace loads and a drift method of discrimination, it is characterized in that, comprises the following steps:
A) temperature data of temperature sensor output is compensated;
B) utilize the temperature data of compensation to proofread and correct zero point drift amount and sensitivity coefficient;
C) utilize sampled data, zero point drift amount and sensitivity coefficient calculated mass;
D) according to the rate of change of quality, trace loading and drift are differentiated.
2. method according to claim 1, is characterized in that, described step a) middle temperature data compensates according to the direction of temperature variation, the proportional relation of relative change rate of temperature data compensation rate and quality.
3. method according to claim 1, is characterized in that, described step b) in zero point drift amount and balance sensitivity coefficient be the function about temperature data T, can utilize the temperature data of the temperature sensor output that is placed on magnet steel inside to proofread and correct.
4. method according to claim 1, it is characterized in that, described step b) in asking for of zero point drift amount and balance sensitivity coefficient comprise the steps: respectively 50g, 100g, 150g and 200g standard test weight to be added to unloading 10 times under 10 DEG C, 15 DEG C, 20 DEG C, 25 DEG C, 30 DEG C five temperature spots, record corresponding quality and be averaged, obtain five groups of qualitative datas under five temperature spots, ask for zero point drift amount and balance sensitivity coefficient.
5. method according to claim 3, it is characterized in that, asking for of penalty coefficient comprises the steps: to load respectively 0g, 50g, 100g, 150g and 200g standard test weight 10min, and record the temperature data of corresponding sampled data, counterbalance mass value and temperature sensor output simultaneously, obtain the mean value that record data start sampled data, counterbalance mass value and the temperature data of 10s and last 10s most, and adopt zero point drift amount and the sensitivity coefficient of trying to achieve to ask for penalty coefficient.
6. method according to claim 1, is characterized in that, described steps d) in when in regular hour section, the rate of change of quality exceedes the ratevalve value X of setting, be determined with trace and load, otherwise be drift.
7. method according to claim 6, it is characterized in that, asking for of the ratevalve value X setting comprises the steps: respectively in the time of drift and trace loading, quality is carried out to data analysis, obtain corresponding rate of mass change, thereby determine and judge and load and drift rate of mass change threshold X, threshold X equal trace load with drift rate of mass change and half.
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Cited By (3)
Publication number  Priority date  Publication date  Assignee  Title 

CN109000879A (en) *  20180627  20181214  中国空气动力研究与发展中心高速空气动力研究所  A kind of windtunnel balance temperature drift modification method 
CN109990885A (en) *  20180102  20190709  梅特勒托利多(常州)精密仪器有限公司  Online parameter adjusts weighing method and system and storage medium 
CN113063482A (en) *  20210325  20210702  梅特勒托利多(常州)精密仪器有限公司  Null shift detection method and system for weighing sensor of aerial work platform 
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Cited By (3)
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Application publication date: 20141015 