CN201803794U - Mesopic vision illuminometer - Google Patents

Abstract

The utility model relates to a mesopic vision illuminometer for detecting the illumination value of fluorescent powder LED light sources with different color temperatures in mesopic vision. The mesopic vision illuminometer comprises an illuminometer probe (1) adopting the photopic vision spectral luminous efficiency function for correction, an illumination measuring instrument consisting of a data processing unit (2) and a display unit (3), and a portable background brightness measuring instrument (4) or a portable reflectivity measuring instrument (5), and is characterized in that the mesopic vision illumination value of the fluorescent powder LED light sources with different color temperatures under the condition of different background brightness L ranging from 10-3cd/m2 to 3cd/m2 is corrected to obtain a group of correction factors B to be stored in an internal memory of the illuminometer. During measurement, the photopic vision illumination value Ev is measured firstly, and then the road background brightness value L is actually measured by the portable brightness measuring instrument; or the road reflectivity is measured by the reflectivity measuring instrument to obtain the background brightness value L corresponding to the road illumination, so as to obtain corresponding correction factors B; and the corresponding mesopic vision illumination value Emes is obtained according to the formula of transformational relation between mesopic vision illumination and photopic vision illumination: Emes is equal to B multiplies Ev. By adopting the illuminometer for detecting the mesopic vision illumination value of fluorescent powder LED light sources with different color temperatures, the illumination value in mesopic vision can be accurately measured, and the mesopic vision illumination value of street lamps, which is actually observed by human eyes, is reflected, so that measurement basis is provided for ensuring the security and energy saving of road lighting.

Description

A kind of mesopic vision illuminometer

Technical field

The utility model relates to a kind of luminosity Detection Techniques, particularly relates to a kind of mesopic vision illuminometer of mesopic vision brightness value of the fluorescent powder type LED light sources of surveying different-colour.

Background technology

The vision of human eye can be carried out the most direct evaluation to illuminating effect.Two kinds of photosensory cells are arranged: cones and rod cells on the human eye retina.The cones is by the cell t of three kinds of different spectral responses, d, and p forms, and sensitivity is low.In brightness is 3cd/m ²Work under the above bright condition, can differentiate the details of color and object.Light stimulus is by after the transmission of optic nerve maincenter, and the spectral response of photic stimuli is called relative luminous efficiency function V (λ), and the response of its maximum is at the 555nm place.Rod cells is 10 in brightness ^-3Cd/m ²Work under the following dark condition, its luminous sensitivity height only can be differentiated light and shade, can not differentiate color and details, and corresponding spectral response is called noctovision spectral luminous efficiency function V ' (λ), and its peak response value is at the 507nm place.Light under the noctovision is looked function and is looked function than the light under the photopic vision and move 48nm to the shortwave direction, and ambient brightness is between 10 ^-3Cd/m ²And 3cd/m ²Between be called mesopic vision, corresponding spectral response is called mesopic spectral luminous efficiency function V _m(λ).At this moment, cones on the retina and rod cells work simultaneously.

V _m(λ) become with ambient brightness, the present confirmable spectral response curve of research neither one to mesopic vision, and existing electric light source, light fixture, luminescent device, the used photometer of display device test all are based on the relative luminous efficiency curve, this photometer under the photopic vision condition and the design of relevant illuminating engineering be suitable, if but under the mesopic vision environment, use and can produce bigger deviation.

And at present a lot of lighting fields, as road lighting, Landscape Lighting, or the tunnel illumination of low-light level all is under the mesopic vision brightness conditions, and particularly in the design of road lighting, reasonably choosing lighting source is to guarantee the security of road lighting and the key of energy saving.If when these illumination Design, adopt the measured data of the illuminometer of mesopic spectral luminous efficiency curve correction as design considerations, such illumination Design and implement just to be consistent with human eye perceives under these mesopic vision environment, otherwise will cause very big deviation.

The instrument of the shading value measurement under the research mesopic vision mainly is to utilize spectrometer and luminosity probe to measure respectively by the relative spectral power distribution of photometry and photopic vision or noctovision light quantity at present, calculate by the absolute light spectral power distributions of photometry by the two, and and then according to the mesopic vision model, further calculate by the photometric quantity of mesopic vision of photometry.But this method relates to spectrometer, photopic vision or noctovision photometer, costs an arm and a leg, and measures complexity, carries and measure all inconvenient.

Summary of the invention

The purpose of this utility model is exactly to provide a kind of illuminometer that can accurately measure the mesopic vision brightness value of fluorescent powder type LED light sources under the mesopic vision environment of different-colour for the deficiency that solves above-mentioned technology.

In order to achieve the above object, a kind of illuminometer of surveying the brightness value of different-colour led light source under mesopic vision that the utility model is designed, it comprises the illuminometer probe (1) that adopts the correction of relative luminous efficiency function, and data processing unit (2), display unit (3) illumination photometry instrument and portable background brightness measurer (4) or the portable albedo measurement instrument (5) formed.It is characterized in that fluorescent powder type LED light sources to different-colour is 10 ^-3Cd/m ²To 3cd/m ²Mesopic vision brightness value under the different background brightness conditions L is revised, and obtains a group correction coefficient B, and deposits in the internal memory of this illuminometer.During measurement, measure photopic vision brightness value E earlier _v, adopt portable surveying instrument actual measurement road surface background luminance value L again; Perhaps adopt reflectance meter to measure the road reflection rate, obtain the pairing background luminance value of road illumination L.According to this background luminance value L, obtain corresponding correction factor B then, by mesopic vision illumination and photopic vision illumination transformational relation formula E _Mes=B * E _v, obtain corresponding mesopic vision brightness value E _MesThe correction factor B of the cluster mesopic vision brightness value of different-colour led light source under different brightness conditions obtains according to the following derivation of equation:

Mesopic vision illumination photometry model:

M(x)V _m(λ)＝xV(λ)+(1-x)V′(λ)，0≤x≤1 (1)

In the formula: V _m(λ) be the mesopic spectral luminous efficiency function; X is the shared ratio of photopic vision, is the amount between 0～1, and is relevant with ambient brightness and light source color temperature, and it is worth shown in subordinate list 1, can be for the x value of other colour temperatures and background luminance by calculating its relative spectral power distribution, and the interpolation by the table intermediate value obtains again.

The fluorescent powder type LED light sources of different-colour comprises YAG type (gold-tinted) led light source that blue-ray LED excites, comprise that also the green glow that blue-ray LED excites adds the red light fluorescent powder type LED light sources, comprise that also the YAG type (gold-tinted) that blue-ray LED excites adds the light source that red LED is formed, and comprises that also blue light, green glow that purple light or ultraviolet leds excite add the red light fluorescent powder type LED light sources.

M (x) is the V under the x _mNormaliztion constant (λ).

By formula (1) the mesopic spectral luminous efficiency function V after the normalization _Mes(λ), obtain V simultaneously _MesPeak wavelength λ (λ) _m, the usefulness K of mesopic vision _Mes:

K _mes＝683/V _mes(555) (2)

Denominator is a 555nm place mesopic spectral luminous efficiency value in the formula, K _MesValue is seen attached list shown in 2.Then, the illumination E of mesopic vision _Mes:

$E_{\mathrm{mes}}=K_{\mathrm{mes}}{\∫}_{380}^{780}P\left(\mathrm{\λ}\right)V_{\mathrm{mes}}\left(\mathrm{\λ}\right)\mathrm{d\λ}---\left(3\right)$

$E_{\mathrm{mes}}=({\mathrm{xE}}_{\mathrm{mes}}/M\left(x\right)){\∫}_{380}^{780}P\left(\mathrm{\λ}\right)V\left(\mathrm{\λ}\right)\mathrm{d\λ}+((1-x)K_{\mathrm{mes}}/M\left(x\right)){\∫}_{380}^{780}P\left(\mathrm{\λ}\right)V^{\′}\left(\mathrm{\λ}\right)\mathrm{d\λ}---\left(4\right)$

E _mes＝(x/683+(1-X)(s/p)/1699)K _mesE _v/M(x)＝B·E _v (5)

Wherein, B=(x/683+ (1-x) (s/p)/1699) K _Mes/ M (x), s/p are institute's photometry source photopic vision and noctovision illumination ratio.B is the illumination correction factor of fluorescent powder type LED light sources under different mesopic vision brightness of different-colour, and it is worth shown in subordinate list 3, and its value is relevant with photopic vision background luminance, fluorescent powder type LED light sources colour temperature.

During measurement, measure the photopic vision brightness value earlier, adopt brightness instrument (4) directly to measure the background luminance value again, perhaps adopt albedometer (5) to measure road reflection rate ρ, concern L=E* ρ/π, obtain the background luminance value of this light source correspondence by illumination and brightness transition.Check in corresponding correction factor B in the internal memory that is stored in illuminometer according to this background luminance L and the led light source colour temperature of surveying, by E _Mes=B * E _v, can record the brightness value E of corresponding fluorescent powder type LED light sources under this mesopic vision condition _Mes

Mesopic vision illuminometer by fluorescent powder type LED light sources brightness value under mesopic vision of the detection different-colour that obtains described in the utility model, can accurately measure the brightness value under the mesopic vision environment, reflect the mesopic vision brightness value that street lamp arrives at actual eye-observation, thereby provide beasurement base for security and the energy saving that guarantees road lighting.

Description of drawings

The mesopic vision illuminometer structural drawing of accompanying drawing 1 the utility model embodiment.

Accompanying drawing 2 usefulness nitometers are measured road surface background luminance value synoptic diagram.

The portable albedometer of accompanying drawing 3 usefulness is measured road reflection rate synoptic diagram.

Embodiment

Below by embodiment the utility model is further described.

Embodiment one:

LED street lamp A, power 120W, this street lamp are the white light sources that blue-light excited YAG fluorescent powder is formed, and colour temperature is 3300K.This light source is installed on the high lamp stand of 9m, sees shown in the accompanying drawing 2 (6), it impinges upon on the road surface (7), and the photopic vision average illumination that records this face to be illuminated with illuminometer is 15.7lx.45 ° of the detection direction of nitometer and road surface angles.The light that street lamp (6) sends enters into the probe of nitometer after the diffuse reflection of road surface (7), the road surface brightness that directly records with nitometer (4) is 1cd/m ²Then the correction factor B of light source 1 is 1.049, and actual mesopic vision brightness value is 16.45lx.

Embodiment two:

LED street lamp B, power 120W, this street lamp are the white light sources that blue-light excited YAG fluorescent powder is formed, and colour temperature is 6000K.This light source is installed on the high lamp stand of 9m, sees shown in the accompanying drawing 2 (6), it impinges upon on the road surface (7), and the photopic vision average illumination that records this face to be illuminated with illuminometer is 15.7lx.The diffuse-reflection factor that records the road surface with portable albedometer (5) is 0.2, as accompanying drawing 3.Albedometer automatic light source (8), probe (9), and data processing unit (10), display unit (11).The light vertical road surface incident that automatic light source (8) sends after the diffuse reflection of road surface (7), records light signal in 45 ° of directions, by being diffuse reflectance coefficient ρ with the irreflexive light signal ratio of standard white plate (12); Getting brightness by illumination brightness transition formula is 1cd/m ²Checking in correction factor B is 1.109, and then Shi Ji mesopic vision brightness value is 17.41lx.

Mesopic vision scale-up factor X value under the different brightness of table 1. street lamp commonly used

Mesopic vision spectral luminous efficacy under the different brightness of table 2. street lamp commonly used

The mesopic vision illumination under the different brightness of table 3. street lamp commonly used and the correction factor B of photopic vision illumination

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Claims (2)

1. mesopic vision illuminometer of surveying fluorescent powder type LED light sources brightness value under mesopic vision of different-colour, it comprises the illuminometer probe (1) that adopts the correction of relative luminous efficiency function, and data processing unit (2), display unit (3) illumination photometry instrument and portable background brightness measurer (4) or the portable albedo measurement instrument (5) formed; It is characterized in that fluorescent powder type LED light sources to different-colour is 10 ^-3Cd/m ²To 3cd/m ²Mesopic vision brightness value under the different background brightness conditions L is revised, and obtains a group correction coefficient B, and deposits in the internal memory of this illuminometer.

2. the illuminometer of measurement mesopic vision brightness value according to claim 1, the fluorescent powder type LED light sources that it is characterized in that different-colour comprises the YAG type led light source that blue-ray LED excites, comprise that also the green glow that blue-ray LED excites adds the red light fluorescent powder type LED light sources, comprise that also the YAG type LED that blue-ray LED excites adds the light source that red LED is formed, and comprises that also blue light, green glow that purple light or ultraviolet leds excite add the red light fluorescent powder type LED light sources.

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