CN1266455C

CN1266455C - Error correcting method with sectional correction according to check point

Info

Publication number: CN1266455C
Application number: CN 02133398
Authority: CN
Inventors: 李伯祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-07-03
Filing date: 2002-07-03
Publication date: 2006-07-26
Anticipated expiration: 2022-07-03
Also published as: CN1465956A

Abstract

The present invention relates to an error correction method with sectional correction according to check points. The method is characterized in that a check point is formed in a bending position of an error curve according to the practical situation of error distribution within a whole measurement range; segments are divided accordingly to practical check points, every two adjacent points form one segment, and a correction value of each point in every segment is calculated by a formula. The method comprises the following three steps in the whole processes of error correction: variable error is filtered, correction is carried out accordingly to a check correction value of a production factory, and correction is carried out accordingly to a user's check correction value.

Description

The error correcting method of segmentation correction according to check point

This method relates to the measuring error correction of microcomputer detection-control equipment.

Existing microcomputer detection-control equipment, as system controlled by computer electronics universal testing machine, be to the modification method of nonlinearity erron: gamut by 0～5%, 5%～10% ... be divided into 5～7 grades so successively, every grade can multiply by a correction factor, and a selected reference point is revised.Its weak point is every grade can only accurately be revised a bit, and reference point preferably.This has correction effect preferably concerning changing comparatively simple error.To changing comparatively complicated error, i.e. nonlinearity erron, as: at same shelves A point is positive error, and D point is a negative error, has then revised the A point, and the D point has been revised in the error increase that D is ordered, the error increase that A is ordered.

First purpose of the present invention is: a kind of error correcting method is provided, and it can be in the gamut scope, with the measuring error of any verification adjusting point, and except that variable error, remaining error secundum legem correction.

Second purpose of the present invention is: the measuring error of any non-checkpoint of gamut can be adapted to a reasonable levels, can eliminate the nonlinearity erron of any measurement point basically.

The 3rd purpose of the present invention is to satisfy the requirement that factory carries out the high precision correction, can make user's verification correction simple and convenient again.

The object of the present invention is achieved like this: according to the check point segmentation of reality, every adjacent 2 is one section, and every section checking data during according to adjacent 2 verifications calculates the error correction values of all the other each points of this section with formula.And with the pairing measured value of this modified value correction.

Computing method 1

Y=YT+ Δ YTB formula 1 Δ YTB=Δ Y (N-1)+[Δ Y (N)-Δ Y (N-1)] [YT-Y (N-1)]/[Y (N)-Y (N-1)]

Formula 2

Y is revised measured value, and YT is the measured value before revising.Δ YTB is a modified value, and N is a serial number, and Y (N) is the proof test value (standard value) that N is ordered, and Δ Y (N) is the modified value of this check point, and Y (N-1) is a N-1 point proof test value (standard value).Δ Y (N-1) is the modified value that N-1 is ordered, this computing method are fairly simple, but because the YT in the formula 2 is a measured value, Y (N-1) is a standard value, there is error between standard value and the measured value, so also there is error in the modified value Δ YTB that calculates with formula 1, big or not high can the making in this way of correction accuracy requirement to variable error.

Computing method 2

Be the problem in calculating above solving, can revise measured value YT with the modified value Δ YTB that calculates for the first time, make YT+ Δ YTB near accurate measured value, the modified value calculated of substitution formula 2 also just further accurately again, calculate the method for new modified value behind the modified value correction measured value (YT) that once calculates before this usefulness again, whenever carry out once, can make the modified value of calculating further accurate, but this correction step is too many, can influence the arithmetic speed of computing machine, revise what of number of times, should decide, generally just can meet the demands by twice correction according to the accuracy requirement of revising.

Computing formula is as follows:

Y=YT+ Δ YT formula 1

ΔYTB＝ΔY(N-1)+[ΔY(N)-ΔY(N-1)][YT-Y(N-1)]/[Y(N)-Y(N-1)]

Formula 2

ΔYTA＝ΔY(N-1)+[ΔY(N)-ΔY(N-1)][YT+ΔYTB-Y(N-1)]/[Y(N)

-Y (N-1)] formula 3

ΔYT＝ΔY(N-1)+[ΔY(N)-ΔY(N-1)][YT+ΔYTA-Y(N-1)]/[Y(N)

-Y (N-1)] formula 4

Δ YTB is the error correction values of the each point that calculates for the first time with the two point form straight-line equation, and Δ YTA revises the modified value of calculating once more behind the YT with Δ YTB, and Δ YT is the modified value of calculating once more with behind the Δ YTA correction YT.

Computing method 3

In computing method 1, if YN in the formula 2 and Y (N-1) use the measured value substitution, like this because [YT-Y (N-1)] is measured value, so YT does not need to revise.

Though it is fairly simple that this method is calculated, because to a certain checkpoint, its measured value changes, so use very inconvenient in the reality.

Δ Y (N) and Δ Y (N-1) in the formula 2 also can use the error substitution, and the Δ YTB that draws also is an error, draws modified value behind the opposite sign.

Below we illustrate the error correction process of this method with example.If there is a puller system as follows first grade proof test value and modified value:

Table 1

Verification serial number N	1	2	3	4
Verification serial number N	1	2	3	4	Proof test value (ox)	100	180	200	300
Measured value (ox)	103	178	197	300.2	Proof test value (ox)	100	180	200	300
Measured value (ox)	103	178	197	300.2	Modified value (ox)	-3	2	3	-0.2

The measured value that selects N=2, N-1=1 to calculate before revising between them at 2 is respectively 103,130,160,178 o'clock modified value.

ΔYTB＝ΔY(N-1)+[ΔY(N)-ΔY(N-1)][YT-Y(N-1)]/[Y(N)-Y(N-1)]

ΔYTB＝-3+[2-(-3)](103-100)/(180-100)

＝-2.8

ΔYTA＝ΔY(N-1)+[ΔY(N)-ΔY(N-1)][YT+ΔYTB-Y(N-1)]/[Y(N)

-Y(N-1)]

ΔYTA＝(-3)+[2-(-3)][103+(-2.8)-100]/(180-100)

＝-2.99

ΔYT＝ΔY(N-1)+[ΔY(N)-ΔY(N-1)][YT+ΔYTA-Y(N-1)]/[Y(N)-

Y(N-1)]

ΔYT＝(-3)+[2-(-3)][103+(-2.99)-100]/(180-100)

＝-3

The modified value that in like manner can calculate at 130,160,178 is respectively-1.2,0.79,2.Substitution formula 1 obtains revised measured value and is respectively 100,128.8,160.79,180.Use the same method and to revise other error of 3 sections.

If calculate with the 3rd kind of method, YN=178 then, Y (N-1)=103, YT=103, substitution formula 2.

ΔYT＝ΔY(N-1)+[ΔY(N)-ΔY(N-1)][YT-Y(N-1)]/[Y(N)-Y(N-1)]

ΔYT＝-3+[2-(-3)](103-103)/(178-103)＝3

Error correcting method above using, can be the measuring error of any verification adjusting point of gamut, remaining error correction is to approaching zero except that variable error, but What gives to the error correction of non-verification adjusting point? foregoing Error Calculation formula, be that the difference that is based upon the modified value of point-to-point transmission changes along with the variation of this section range on the basis of this hypothesis, if this variation is uniform, be that modified value is at coordinate (YT, Δ YT) be straight line in, the error of then non-verification adjusting point also can all be revised, but this in practice variation is not exclusively uniformly, also may appear between two checkpoints, one section error increases, one section minimizing situation, for addressing this problem, can take following method: in the gamut scope, Select Error curve corner (mainly being the error maximum point) is as necessary verification adjusting point, the centre can be inserted the verification adjusting point as required, the checkpoint that inserts is many more, the distance of point-to-point transmission is more little, the error change of point-to-point transmission is approaching more evenly, and revised precision is high more.In front in the example, to equal 3 Ns be near 100 Ns of the proof test values max value of error to error in the table 1,-3 Ns is near the max value of error 200 Ns, it is necessary verification adjusting point, if the error correction of maximum is not fallen, then correction effect can be subjected to very big influence, and the 180, the 300th, middle insertion point.Finish revise for the first time after, check new error maximum point once more everywhere, finding to have needs the place revised, then inserts new verification adjusting point, number of times so repeatedly is many more, then revised precision is high more, inspection correction that at least will be once.Because checkpoint is provided with incorrectly, checkpoint is not set to prevent, causes the unfavorable situation of correction effect in the corner of graph of errors.

After choosing checkpoint and obtaining measured value and modified value, the requirement of follow procedure is carried out data processing with proof test value and modified value input computing machine by computing machine, realizes the correction to error.

Be implemented in the gamut scope, can both obtain the nonlinearity erron of each measurement point basically revising, the verification adjusting point that then needs is many, user's verification correction is got up just very inconvenient like this, for this reason, adopt manufacturer separately to use the different software pages with the user, can use identical and different proof test values and modified value separately, user's verification makeover process does not influence the verification makeover process of original production producer, the needs of producer's high precision correction so both can have been satisfied, can satisfy the requirement of user again, and make user's verification correction simple and convenient by the actual needs correction.

Factory mainly is Select Error curve corner during verification, particularly the error maximum point is taken into account the actual needs point and is carried out the verification correction, and what of adjusting point are not limit, 10～30 of checkpoints generally can be set, and the nonlinearity erron that can make measuring system like this is basically by the standard correction.

User's verification makeover process is mainly used in and revises measuring equipment environment for use difference, uses measured value drift, the different caused errors of verification standard for a long time.Mainly verification correction according to actual needs, checkpoint can be set at 5～10.

Fig. 1 is a computer program process flow diagram of realizing that producer's error correction and user's error correction are independently finished separately, and factory is just abbreviated as verification 1 in the process of verification, and the user just abbreviates verification 2 as in the process of verification.The process of by formula revising with the proof test value and the modified value of factory is called verification 1 correction, and the process that user's proof test value and modified value are by formula revised calls verification 2 and revises.

Claims

1 presses the error correcting method of checkpoint segmentation correction, is that checking data is imported computing machine, carries out data processing by computing machine, realizes the correction to error; It is characterized in that: according to the checkpoint segmentation of reality, every adjacent 2 is one section, every section error by following formula correction each point.

Y=YT+ Δ YT B formula 1

ΔYTB＝ΔY(N-1)+[ΔY(N)-ΔY(N-1)][YT-Y(N-1)]/[Y(N)-Y(N-1)]

Formula 2

Y is revised measured value in the formula, and YT is the measured value before revising, and Δ YTB is a modified value, N is a serial number, and Y (N) is the proof test value that N is ordered, and Δ Y (N) is the modified value of this check point, Y (N-1) is the proof test value that N-1 is ordered, and Δ Y (N-1) is the modified value that N-1 is ordered.

2 by the described error correcting method of claim 1, it is characterized in that: after calculating modified value with formula 2, with the YT in this modified value correction formula 2, make the YT in the formula 2 become YT+ Δ YTB, substitution formula 2 calcuating correction values once more are behind the measured value YT in the modified value correction formula of once calculating before this usefulness 2, the process of calcuating correction value once more, can carry out once or once, the modified value correction measured value with last draws correction result.

3 by the described error correcting method of claim 1, and it is characterized in that: in the computing formula 2, Y (N) is the measured value that N is ordered, and Y (N-1) is the measured value that N-1 is ordered.

4 by each described error correcting method in the claim 1,2,3, it is characterized in that: in gamut journey scope, Select Error curve corner mainly is the error maximum point, as necessary verification adjusting point, the centre can be inserted the verification adjusting point as required.

5 by each described error correcting method in the claim 1,2,3, it is characterized in that manufacturer's checking procedure and user's checking procedure are independent separately, uses the different software pages respectively, can use identical and different effect values and modified value separately.