CN105241640A - Device for measuring blue light weighted radiation intensity and method thereof - Google Patents

Abstract

The invention discloses a device for measuring blue light weighted radiation intensity and a method thereof, wherein the device for measuring the blue light weighted radiation intensity comprises a testing system and a sighting system, the testing system comprises an objective lens, a perforated mirror, a lens, a first dispersion element, an attenuation slice, a second dispersion element and a photovoltaic cell, the photovoltaic cell is connected with a voltmeter, the objective lens, the lens, the first dispersion element, the attenuation slice, the second dispersion element, a photovoltaic center of the photovoltaic cell, a hole of the perforated mirror and a light source are arranged on a same optical shaft, the attenuation slice is closely fit on the second dispersion element, the sighting system orderly comprises an objective lens, a reflecting mirror, a delay lens group, a cursor and an eyepiece, reflecting rays of the perforated mirror are sent to the reflecting mirror, the reflecting rays of the reflecting mirror are sent into the eyepiece through the delay lens group and the cursor, and the objective lens, eyes and photovoltaic cells are conjugate. The device for measuring blue light weighted radiation intensity and the method thereof are simple in structure, small in volume, light in weight, convenient to use, rapid in response speed, cheap in price and small in technical difficulty, and are suitable to be used in indoor and outdoor various occasions and the like.

Description

A kind of measurement mechanism of blue light weighting radiance and method thereof

Technical field

The present invention relates to field of photodetection, particularly a kind of measurement mechanism of blue light weighting radiance and method thereof.

Background technology

LED has become conventional illumination and display light source.Along with the development of technology, LED light exports increasing.Bring efficient illumination and highlighted display screen, also bring " blue light harm " meanwhile.

At present, national and foreign standards, as CIES009/E:2002, IEC/TR62471-2-2009, IEC/TR62778-2012, the GB/T20145-2006 etc. of China, all defines the size that " blue light weighting radiance " describes blue light harm.According to these standards, blue light weighting radiance L _bobtained by light source light spectrum radiance L (λ) weighting blue light coefficient of injury B (λ):

$L_B=\underset{300}{\overset{700}{\Σ}}L\left(\mathrm{\λ}\right)B\left(\mathrm{\λ}\right)\mathrm{\Δ}\mathrm{\λ}$

The core of blue light weighting radiance measurement is under measurement standard defined terms, the spectral radiance L (λ) of light source.Corresponding proving installation is as the OST-300 reflective optical security test macro an of distant place, Hangzhou Photoelectric Co., Ltd..But in actual measurement, proving installation is mainly made up of the spectrometer of nitometer and 300nm to 700nm scope, for LED light source, expect result accurately, spectrometer step-length requires that spectral error is not more than 3% for 0.2nm, light fixture needs to be placed on guide rail, need darkroom, therefore, the method condition is too harsh, can only use in laboratory, the assessment of blue light harm can not be carried out general lighting.

Summary of the invention

For problems of the prior art, the invention provides one and be applicable to daily life, device structure is simple, and low price, can assess measurement mechanism and the method thereof of the blue light weighting radiance of general lighting light fixture fast, accurately and easily.

Object of the present invention is achieved through the following technical solutions.

A measurement mechanism for blue light weighting radiance, comprises test macro and sighting system, and described test macro comprises object lens successively, catoptron with holes, lens, first dispersion element, attenuator, second dispersion element and photoelectric cell, described photoelectric cell is connected with voltage table, described object lens, lens, first dispersion element, attenuator, second dispersion element, the hole of photronic optical centre and catoptron with holes and light source are on same optical axis, the emergent ray of described object lens is incident on lens by the hole of reflective mirror with holes, the emergent ray of described lens is incident on the first dispersion element, described attenuator is between the first dispersion element and the second dispersion element, and described sighting system comprises object lens successively, catoptron, time delay lens combination, cursor and eyepiece, the reflection ray of described reflective mirror with holes incides on reflective mirror, and the reflection ray of described reflective mirror is incident on eyepiece by time delay lens combination and cursor, described object lens and human eye, photoelectric cell conjugation.

Described attenuator is distributed attenuator.

A measuring method for blue light weighting radiance, calibration steps comprises:

1) select a blue light weighting radiance to be that light source place placed by L1 standard lamp, regulate catoptron with holes to move in parallel along mirror plane, make light reflex to human eye, human eye aims at standard lamp by sighting system;

2) keep instrument motionless, regulate catoptron with holes along the parallel playback of mirror plane, the light that standard lamp is sent enters test macro from hole, enter the first dispersion element, distributed attenuator through lens are parallel successively, second dispersion element is to arriving photoelectric cell, and from voltage table, read registration is U1;

Measuring process comprises:

3) light source to be measured is placed on light source place, regulates catoptron with holes to move in parallel along mirror plane, make human eye aim at light source to be measured by sighting system;

4) keep instrument motionless, regulate catoptron with holes along the parallel playback of mirror plane, from voltage table, read registration is U2;

5) the blue light weighting radiance calculating light source to be measured is U2L1/U1.

Compared to prior art, the invention has the advantages that: structure is simple, and volume is little, lightweight, easy to use, fast response time, low price, and technical difficulty is little, use under being applicable to the multiple occasions such as indoor and outdoors.

Accompanying drawing explanation

Fig. 1 is the structural representation of the measurement mechanism of a kind of blue light weighting of the present invention radiance.

Fig. 2 is prism chromatic dispersion principle figure.

In figure: 1, light source 2, object lens 3, catoptron with holes 4, lens 5, first dispersion element 6, distributed attenuator 7, second dispersion element 8, photoelectric cell 9, voltage table 10, catoptron 11, time delay lens combination 12, cursor 13, eyepiece.

Embodiment

Below in conjunction with Figure of description and specific embodiment, the present invention is described in detail.

As shown in Figure 1, a kind of measurement mechanism of blue light weighting radiance, a kind of measurement mechanism of blue light weighting radiance, comprise test macro and sighting system, described test macro comprises object lens 2 successively, catoptron 3 with holes, lens 4, first dispersion element 5, distributed attenuator 6, second dispersion element 7 and photoelectric cell 8, described photoelectric cell 8 is connected with voltage table 9, described object lens 2, lens 4, first dispersion element 5, distributed attenuator 6, second dispersion element 7, the optical centre of photoelectric cell 8 and the hole of catoptron with holes 3 and light source 1 are on same optical axis, the emergent ray of described object lens 2 is incident on lens 4 by the hole of reflective mirror with holes, the emergent ray of described lens 4 is incident on the first dispersion element 5, described distributed attenuator 6 is close to the second dispersion element 7, and described sighting system comprises catoptron 10 successively, time delay lens combination 11, cursor 12 and eyepiece 13, the reflection ray of described reflective mirror with holes incides on reflective mirror, and the reflection ray of described reflective mirror is incident on eyepiece 13 by time delay lens combination 11 and cursor 12, described object lens 2 and human eye, photoelectric cell 8 conjugation.

" the first dispersion element 5, distributed attenuator 6, second dispersion element 7, " is the core apparatus of this patent.The effect of the first dispersion element 5 is separated in space by spectral distribution by incident light, and the effect of the second dispersion element 7 is contrary, is together photosynthetic by what separate by spectral distribution.They can be prism and Fresnel Lenses, also can be other dispersion elements, attenuator 6 light decay rate different and different with locus, be the function of locus.

A measuring method for blue light weighting radiance, calibration steps comprises:

1) select a blue light weighting radiance to be that light source 1 place placed by L1 standard lamp, regulate catoptron 3 with holes to move in parallel along catoptron 10 plane, make human eye aim at standard lamp by sighting system;

2) keep instrument motionless, regulate catoptron 3 with holes along the parallel playback of catoptron 10 plane, the light that standard lamp is sent enters test macro from hole, enter the first dispersion element 5, distributed attenuator 6 through lens 4 are parallel successively, second dispersion element 7 is to arriving photoelectric cell 8, and from voltage table 9, read registration is U1;

Measuring process:

3) light source to be measured is placed on light source 1 place, regulates catoptron 3 with holes to move in parallel along catoptron 10 plane, make human eye aim at light source to be measured by sighting system;

4) keep instrument motionless, regulate catoptron 3 with holes along the parallel playback of catoptron 10 plane, from voltage table 9, read registration is U2;

5) the blue light weighting radiance calculating light source to be measured is U2 × L1/U1.

As shown in Figure 2, incident light L (λ) is transmitted on distributed attenuator 6 according to wavelength difference by the first dispersion element 5 (for prism) respectively, as figure below, position x different like this and different wavelength X one_to_one corresponding, if decayed according to suitable attenuation function A (x), emergent light through the second dispersion element is just equivalent to just decay according to wavelength A (λ) to incident light L (λ), is designated as L (λ) A (λ).

The light of incident first dispersion element 5 of L (λ), λ is optical wavelength, and X represents position or the coordinate of distributed attenuation sheet, and in figure, the position of λ 1 correspondence is topmost, and the position of λ 4 correspondence is bottom.A (x) is the attenuation function of distributed attenuation sheet, and namely L (x) is by after this attenuator, becomes L (x) A (x).

The light exported after second prism 7 injects photoelectric cell 8, converts electricity to and exports, if the spectral response of photoelectric cell 8 is S (λ), then electricity exports and light radiation be directly proportional, clearly, the alternative condition of A (x) is B (λ)=A (λ) S (λ).

Like this $\underset{380}{\overset{780}{\∫}}L\left(\mathrm{\λ}\right)B\left(\mathrm{\λ}\right)d\mathrm{\λ}=\underset{380}{\overset{780}{\∫}}L\left(\mathrm{\λ}\right)A\left(\mathrm{\λ}\right)S\left(\mathrm{\λ}\right)d\mathrm{\λ}=L_B$

Finally, this value is shown by voltage table 9.

Prism is a kind of selectable dispersion element, in order to improve chromatic dispersion effects, can also use other elements such as binary face.

The novelty of this patent is: by more difficult blue light harm weighting function B (λ) coupling, become the design of fairly simple distributed attenuator 6, greatly reduce design difficulty.

Distributed attenuator 6 by changing the thickness of light transmission piece, can be changed the modes such as glazed area and realizing, also directly can be plated on 7 by distributed attenuator 6 by plated film.The distributed attenuation rate that these process technologies obtain can reach very high precision, can meet the needs of this patent.

Claims (3)

1. a measurement mechanism for blue light weighting radiance, comprises test macro and sighting system, it is characterized in that described test macro comprises object lens successively, catoptron with holes, lens, first dispersion element, attenuator, second dispersion element and photoelectric cell, described photoelectric cell is connected with voltage table, described object lens, lens, first dispersion element, attenuator, second dispersion element, the hole of photronic optical centre and catoptron with holes and light source are on same optical axis, the emergent ray of described object lens is incident on lens by the hole of reflective mirror with holes, the emergent ray of described lens is incident on the first dispersion element, described attenuator is between the first dispersion element and the second dispersion element, and described sighting system comprises object lens successively, catoptron, time delay lens combination, cursor and eyepiece, the reflection ray of described reflective mirror with holes incides on reflective mirror, and the reflection ray of described reflective mirror is incident on eyepiece by time delay lens combination and cursor, described object lens and human eye, photoelectric cell conjugation.

2. the measurement mechanism of a kind of blue light weighting radiance according to claim 1, is characterized in that described attenuator is distributed attenuator.

3. a measuring method for blue light weighting radiance, is characterized in that calibration steps comprises:

1) select a blue light weighting radiance to be that light source place placed by L1 standard lamp, regulate catoptron with holes to move in parallel along mirror plane, make light reflex to human eye, human eye aims at standard lamp by sighting system;

2) keep instrument motionless, regulate catoptron with holes along the parallel playback of mirror plane, the light that standard lamp is sent enters test macro from hole, enter the first dispersion element, distributed attenuator through lens are parallel successively, second dispersion element is to arriving photoelectric cell, and from voltage table, read registration is U1;

Measuring process comprises:

3) light source to be measured is placed on light source place, regulates catoptron with holes to move in parallel along mirror plane, make human eye aim at light source to be measured by sighting system;

4) keep instrument motionless, regulate catoptron with holes along the parallel playback of mirror plane, from voltage table, read registration is U2;

5) the blue light weighting radiance calculating light source to be measured is U2 × L1/U1.