CN202770622U - Integrating sphere light source radiation non-uniformity calibration system - Google Patents

Abstract

The utility model discloses an integrating sphere light source radiation non-uniformity calibration system, comprising a scanning detector, a monitoring detector, a multidimensional precision displacement table, a first digital multimeter, a second digital multimeter, and a controller. The scanning detector is fixed on the multidimensional precision displacement table. The monitoring detector is located at a monitoring hole of a calibrated integrating sphere. The multidimensional precision displacement table and the controller are connected. The first digital multimeter is connected with the scanning detector. The second digital multimeter is connected with the monitoring detector. The controller is connected with the first digital multimeter and the second digital multimeter. According to the utility model, the influence of drifting on calibration results is excluded in the calculation so that an integrating sphere radiation area can be covered exactly.

Description

Integrating sphere radiation of light source heterogeneity scaling system

Technical field

The utility model relates to a kind of scaling system, particularly relates to a kind of integrating sphere radiation of light source heterogeneity scaling system.

Background technology

The integrating sphere light source is one of radiation standard the most frequently used in the measurement and calibration, is widely used in measurement and calibration nitometer, radiancy meter, image device, camera and flat-panel display device etc.The radiation heterogeneity is the important index of integrating sphere light source, and is relevant with many factors such as the distribution of the reflectance coating of integrating sphere, light source, aperture positions.Traditional quadrature ball radiation of light source heterogeneity calibrating method often adopts photodetector " planar arcuate " scanning method, namely single-element detector is placed on the displacement platform that precise 2-D moves, the computer control precise displacement platform carries out two dimensional surface scanning at integrating sphere light hole place, whenever scan a position, the output signal of record detector.After integrating sphere light hole scanning one time, will obtain the output optical signal of each position, light hole place, the signal of each position is brought into following formula (1), can try to achieve non-homogeneous of the radiation of integrating sphere.

$U=\frac{1}{\stackrel{\‾}{V}}\×\sqrt{\frac{1}{M-1}{(V_i-\stackrel{\‾}{V})}^2}\×100\%...\left(1\right)$

In the formula: U---integrating sphere radiation heterogeneity; M---displacement platform scanning position number;

The mean value of all position sensor output voltage signals; V _i---i position sensor output voltage signal.

Integrating sphere radiation of light source heterogeneity calibrating method often adopts photodetector " planar arcuate " scanning method, and scanning area is square.There is following shortcoming in this calibrating method: do not consider in the scanning process that one, the drift of integrating sphere light source self is on the impact of the calibration results.Two, " arc " scanning area is a square, and integrating sphere radiating aperture is circular substantially, and scanning area can't just in time cover whole radiation areas.Three, scanning is in one plane carried out, rather than carries out at sphere, can not reflect the radiation heterogeneity on the integrating sphere light source sphere.

The utility model content

Technical problem to be solved in the utility model provides a kind of integrating sphere radiation of light source heterogeneity scaling system, and it deducts drift to the impact of the calibration results in calculating, can just in time cover the integrating sphere radiation areas.

The utility model solves above-mentioned technical matters by following technical proposals: a kind of integrating sphere radiation of light source heterogeneity scaling system, it is characterized in that, it comprises scan detector, monitoring detector, multidimensional precision displacement table, the first digital multimeter, the second digital multimeter, controller, and scan detector is fixed on the multidimensional precision displacement table; Monitoring detector is positioned at a monitoring holes place being demarcated integrating sphere; The multidimensional precision displacement table links to each other with controller; The first digital multimeter links to each other with scan detector; The second digital multimeter links to each other with monitoring detector; Controller links to each other with the first digital multimeter, the second digital multimeter.

Positive progressive effect of the present utility model is: one, the utility model has increased a monitoring detector, and self drifting about of integrating sphere demarcated in monitoring in scanning process, and deducts drift to the impact of the calibration results in calculating.Two, the utility model scanning pattern is circular, rather than square, can just in time cover the integrating sphere radiation areas.Three, the utility model scanning is carried out at the integrating sphere sphere, rather than (or tangent plane) carries out on the plane, more can reflect the radiating surface heterogeneity of integrating sphere.Four, the utility model graphically shows with 2D and 3D, and calibration result is more directly perceived.

Description of drawings

Fig. 1 is the theory diagram of the utility model integrating sphere radiation of light source heterogeneity scaling system.

Embodiment

Provide the utility model preferred embodiment below in conjunction with accompanying drawing, to describe the technical solution of the utility model in detail.

As shown in Figure 1, the utility model integrating sphere radiation of light source heterogeneity scaling system comprises scan detector 1, monitoring detector 2, multidimensional precision displacement table 3, the first digital multimeter 4, the second digital multimeter 5, controller 6, the multidimensional precision displacement table comprises angle rotating mechanism, X-axis displacement mechanism, Y-axis displacement mechanism, Z axis displacement mechanism, be the displacement regulatory function that the multidimensional precision displacement table not only has x axle, y axle, z axle, and have the angle spinfunction.The first digital multimeter 4 is 34401 type digital multimeters, and scan detector, monitoring detector are si-100 type detector.The scanning pattern of scan detector is the sphere circular path.

Scan detector 1 is fixed on the multidimensional precision displacement table 3, in scanning process, is used for surveying the optical radiation of being demarcated integrating sphere 7 radiation control diverse location places strong and weak; Monitoring detector 2 is positioned at by monitoring holes 72 places of demarcation integrating sphere 7, is used for monitoring and is demarcated self drifting about of integrating sphere optical radiation; Multidimensional precision displacement table 3 links to each other with controller 6, specifically can link to each other with controller 6 by the RS232 cable, under the control of controller 6, realizes the sphere circular scan of scan detector 1 in a radiating aperture 71 of being demarcated integrating sphere; The first digital multimeter 4 links to each other with scan detector 1, specifically can link to each other with scan detector 1 by the BNC cable, be used for receiving first output signal (sweep signal) of scan detector 1, and by the GPIB cable the first output signal sent to controller 6; The second digital multimeter 5 links to each other with monitoring detector 2, specifically can link to each other with monitoring detector 2 by the BNC cable, be used for receiving second output signal (monitor signal) of monitoring detector 2, and by the GPIB cable the second output signal sent to controller 6; Controller 6 links to each other with the first digital multimeter 4, the second digital multimeter 5, specifically can link to each other with the first digital multimeter 4, the second digital multimeter 5 by the GPIB cable, obtain sweep signal and monitor signal from them respectively, link to each other with multidimensional precision displacement table 3 by the RS232 cable, by sending control command, realize " sphere is circular " scanning, according to image data, calculate the radiation heterogeneity of being demarcated integrating sphere light, and show the calibration results.

The utility model is realized integrating sphere radiation of light source heterogeneity scaling function, specifically may further comprise the steps:

S1, scan detector 1, monitoring detector 2, multidimensional precision displacement table 3, the first digital multimeter 4, the second digital multimeter 5, controller 6 connected, preheating is carried out in energising, such as preheating after the energising more than 30 minutes;

S2, controller 6 move to scan detector 1 by the RS232 cable center of the angle rotating mechanism of multidimensional precision displacement table 3, and the X-axis displacement mechanism of logical multidimensional precision displacement table, Y-axis displacement mechanism, Z axis displacement mechanism move to scan detector 1 by the sphere place, radiating aperture center of scalar product bulb separation;

S3, controller 6 are by RS232 cable control multidimensional precision displacement table 3, demarcate the enterprising line scanning of sphere of the radiating aperture of integrating sphere at quilt by the radius stepping Δ r that sets and angle stepping Δ θ, whenever scan a position, controller 6 reads the first output signal of scan detector 1 from the first digital multimeter 4 by the GPIB cable, be designated as V _{(r, θ, i)}, read the second output signal of monitoring detector 2 from the second digital multimeter 5 by the GPIB cable with Time Controller 6, be designated as V _{S, i}

S4, calculate monitoring detector 2 at the mean value of different scanning position output signal

Computing formula is as shown in the formula (2):

$\stackrel{\‾}{V_s}=\frac{1}{N}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{V}_{s,i}...\left(2\right)$

In the formula: N is number of scan points.

The radiation of each analyzing spot drift V then _{σ, i}For as shown in the formula (3):

$V_{\mathrm{\σ},i}=V_{s,i}-\stackrel{\‾}{V_s}...\left(3\right)$

After the deduction radiation drift, demarcated integrating sphere at the real output signal V ' of each analyzing spot _{(r, θ, i)}For as shown in the formula (4):

V′ _(r，θ，i)＝V _(r，θ，i)-V _σ，i.....................................(4)

Demarcated the real output signal mean value of integrating sphere at each analyzing spot For as shown in the formula (5):

$\stackrel{\‾}{V_{(r,\mathrm{\θ})}^{\′}}=\frac{1}{N}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{V}_{(r,\mathrm{\θ},i)}^{\′}...\left(5\right)$

Then demarcated integrating sphere radiation heterogeneity calibration result U _RFor as shown in the formula (6):

$U_R=\frac{1}{\stackrel{\‾}{V_{(r,\mathrm{\θ})}^{\′}}}\×\sqrt{\frac{1}{N-1}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{(V_{(r,\mathrm{\θ},i)}^{\′}-\stackrel{\‾}{V_{(r,\mathrm{\θ})}^{\′}})}^2}\×100\%...\left(6\right)$

S5, result show: provide integrating sphere radiation heterogeneity calibration result U _R, and show 2D and the 3D heterogeneity image of deducting after drift affects.Sample result proves, the utility model can realize that track while scan be " sphere circle " to the heteropical high precision calibration of integrating sphere radiation, and in the radiating aperture of Φ=20cm, the radiation heterogeneity has reached 0.4%.

Those skilled in the art can carry out various remodeling and change to the utility model.Therefore, the utility model has covered various remodeling and the change in the scope that falls into appending claims and equivalent thereof.

Claims (1)

1. integrating sphere radiation of light source heterogeneity scaling system, it is characterized in that, it comprises scan detector, monitoring detector, multidimensional precision displacement table, the first digital multimeter, the second digital multimeter, controller, and scan detector is fixed on the multidimensional precision displacement table; Monitoring detector is positioned at a monitoring holes place being demarcated integrating sphere; The multidimensional precision displacement table links to each other with controller; The first digital multimeter links to each other with scan detector; The second digital multimeter links to each other with monitoring detector; Controller links to each other with the first digital multimeter, the second digital multimeter.

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