CN106989749A - A kind of method for eliminating paper chart glass refraction error - Google Patents

Abstract

The present invention relates to a kind of method for eliminating paper chart glass refraction error, its technical characterstic is to comprise the following steps：According to area source height, thickness of glass, glass refraction, irradiation target position information under glass plate, refractive error offset angle is calculated using recursive calculation method；Compensated according to refractive error offset angle to being irradiated to the irradiant angle of assigned target position so that the light of the angle is accurately irradiated to scheduled target position after glass plate is reflected.The present invention is calculated refractive error offset angle and compensated using recursion method, is finally given the due injection angle of desired locations light of irradiation, is enabled to error to restrain rapidly, is reduced because of the error that refractive index is produced, is improved and mark and draw pointing accuracy；Apply it on paper chart to mark and draw and indicate, can effectively overcome the problem of light beam irradiates the deviation of paper chart through glass.

Description

A kind of method for eliminating paper chart glass refraction error

Technical field

Technical field is marked and drawed the invention belongs to naval vessel paper chart, especially a kind of elimination paper chart glass refraction error Method.

Background technology

Instruction luminous point is marked and drawed during navigation, it is necessary on paper chart in naval vessel.Paper chart is laid in glass when using On plate, there is instrument to send light beam below glass plate, light beam impinges upon paper chart one luminous point of formation, can indicated with the luminous point The position of this warship or other ships on paper chart.It is irradiated to when light beam is angled on glass, through glass in paper chart Upper formation luminous point, because of the actual irradiation position of glass refraction and actually answers indicating positions to there is deviation.The deviation and thickness of glass, enter The factors such as shooting angle have relation, have a strong impact on pointing accuracy and threaten navigation safety.

The content of the invention

It is an object of the invention to overcome the deficiencies of the prior art and provide one kind it is reasonable in design, error can be made quickly to receive The method held back and improve the elimination paper chart glass refraction error for marking and drawing pointing accuracy.

The present invention solves existing technical problem and takes following technical scheme to realize：

A kind of method for eliminating paper chart glass refraction error, comprises the following steps：

Step 1, according to area source height under glass plate, thickness of glass, glass refraction, irradiation target position information, adopt Refractive error offset angle is calculated with recursive calculation method；

Step 2, mended to being irradiated to the irradiant angle of assigned target position according to refractive error offset angle Repay so that the light of the angle is accurately irradiated to scheduled target position after glass plate is reflected.

The specific method that the step 1 calculates refractive error offset angle is：

If light source distance lower glass surface distance is H, thickness of glass is h, and refractive index is n, light irradiation lower glass surface Point is O, it is contemplated that point of irradiation is A, and actual point of irradiation is B, and incidence angle is α, and refraction angle is β, and incident hair line is handed over glass top surface Point is M；

(1) first time iteration：

1. the distance between estimated point of irradiation A and actual point of irradiation B is calculated：| AM |-| BM |, wherein, MA=htan α,

2. incident angle change is calculatedMake α₁=α+Δ α, power supply light presses α₁Project, light shines Lower glass surface position is penetrated for B₁, wherein | AB |=| OO₁|, the light irradiation glass top surface B after glass refraction₁Position.

(2) second of iteration：

Actual point of irradiation B is replaced with to the actual point of irradiation B in first time iteration₁, incident angle α is replaced with and changed for the first time Incident angle α in generation₁Second of iteration is carried out, and calculates A and B₁The distance between, willIt is used as angle Degree compensation is added in incident angle of light；As Δ α_nIt is sufficiently small and disclosure satisfy that required precision, you can to terminate iteration；

By above-mentioned iterative process, refractive error offset angle is obtained for Δ α+Δ α₁...+Δα_n。

Advantages and positive effects of the present invention are：

The present invention according to area source height under glass plate, thickness of glass, glass refraction, irradiate the information such as target location, Refractive error offset angle is calculated using recursion method and compensated, finally giving the desired locations light of irradiation should have Injection angle, the light of the angle can be irradiated to scheduled target position after glass plate is reflected, and the present invention uses recurrence Computational methods enable to error to restrain rapidly, reduce because of the error that refractive index is produced, improve and mark and draw pointing accuracy.Answered Use to mark and draw on paper chart and indicate, can effectively overcome the problem of light beam irradiates the deviation of paper chart through glass.

Brief description of the drawings

Fig. 1 is schematic diagram of the invention；

Fig. 2 is the actual irradiation position of light source injection angle and expects irradiation position graph of a relation；

Fig. 3 is glass refraction error schematic diagram.

Embodiment

The embodiment of the present invention is further described below in conjunction with accompanying drawing：

The present invention is analyzed first against glass refraction error Producing reason and error size.As shown in Fig. 2 working as Under glass plate light source to the paper chart of glass plate upper surface mark and draw luminous point when, it is α, light source to project light and glass plate normal angle Subpoint O, expectation irradiation position A and actual irradiation position B on a glass is on same straight line, the company between the straight line Line is with dextrad angleDue to light source position, irradiation position A and actual irradiation position B is expected in the same plane, to light source The compensation of injection angle can be compensated only α,Keep constant, from figure 3, it can be seen that when incident angle is α, thickness of glass is h When, refractive index is n, and the error AB of generation is as follows：

The present invention is directed to glass refraction error Producing reason and error, proposes a kind of elimination paper chart glass refraction The method of error, comprises the following steps：

Step 1, according to area source height under glass plate, thickness of glass, glass refraction, irradiation target position information, adopt Refractive error offset angle is calculated with recursive calculation method.

As shown in figure 1, setting light source distance lower glass surface under H, thickness of glass h, refractive index n, light irradiation glass Surface point O, it is contemplated that point of irradiation A, actual point of irradiation B, incident angle α, refraction angle β, incident hair line and glass top surface intersection point M. In figure right side for+, angle clockwise for+.

When calculating refractive error offset angle, calculated using recursion method, detailed process is：

(1) first time iteration：

1. the distance between estimated point of irradiation A and actual point of irradiation B is calculated：| AM |-| BM |, wherein,

2. incident angle change is calculatedMake α₁=α+Δ α, power supply light presses α₁Project, light shines Lower glass surface position is penetrated for B₁, wherein | AB |=| OO₁|, the light irradiation glass top surface B after glass refraction₁Position.

(2) second of iteration：

Actual point of irradiation B in first time iteration is replaced with into B₁, incident angle α replaces with α₁Second of iteration is carried out, and is counted Calculate A B₁The distance between, willIt is added to as angle compensation in incident angle of light.As Δ α_nEnough It is small and disclosure satisfy that required precision, you can to terminate iteration.

Pass through above-mentioned iterative process, you can to complete the correction that glass refraction produces error, the angle for projecting light α is mended Repay and should be Δ α+Δ α₁...+Δα_n。

Step 2, mended to being irradiated to the irradiant angle of assigned target position according to refractive error offset angle Repay so that the light of the angle is accurately irradiated to scheduled target position after glass plate is reflected.

It is emphasized that embodiment of the present invention is illustrative, rather than it is limited, therefore present invention bag Include and be not limited to embodiment described in embodiment, it is every by those skilled in the art's technique according to the invention scheme The other embodiment drawn, also belongs to the scope of protection of the invention.

Claims (2)

1. a kind of method for eliminating paper chart glass refraction error, it is characterised in that comprise the following steps：

Step 1, according to area source height under glass plate, thickness of glass, glass refraction, irradiation target position information, using passing Computational methods are returned to calculate refractive error offset angle；

Step 2, compensated according to refractive error offset angle, made to being irradiated to the irradiant angle of assigned target position The light for obtaining the angle is accurately irradiated to scheduled target position after glass plate is reflected.

2. a kind of method for eliminating paper chart glass refraction error according to claim 1, it is characterised in that：The step It is rapid 1 calculating refractive error offset angle specific method be：

If light source distance lower glass surface distance is H, thickness of glass is h, and refractive index is n, and light irradiation lower glass surface point is O, it is contemplated that point of irradiation is A, actual point of irradiation is B, and incidence angle is α, and refraction angle is β, and incident hair line is with glass top surface intersection point M；

(1) first time iteration：

1. the distance between estimated point of irradiation A and actual point of irradiation B is calculated：| AM |-| BM |, wherein, MA=htan α,

2. incident angle change is calculatedMake α₁=α+Δ α, power supply light presses α₁Project, light irradiation glass Glass lower surface position is B₁, wherein | AB |=| OO₁|, the light irradiation glass top surface B after glass refraction₁Position.

(2) second of iteration：

Actual point of irradiation B is replaced with to the actual point of irradiation B in first time iteration₁, incident angle α is replaced with first time iteration Incident angle α₁Second of iteration is carried out, and calculates A and B₁The distance between, willIt is used as angle compensation It is added in incident angle of light；As Δ α_nIt is sufficiently small and disclosure satisfy that required precision, you can to terminate iteration；

By above-mentioned iterative process, refractive error offset angle is obtained for Δ α+Δ α₁...+Δα_n。