CN201488811U - Photosynthetic radiation luminometer - Google Patents
Photosynthetic radiation luminometer Download PDFInfo
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- CN201488811U CN201488811U CN2009201924105U CN200920192410U CN201488811U CN 201488811 U CN201488811 U CN 201488811U CN 2009201924105 U CN2009201924105 U CN 2009201924105U CN 200920192410 U CN200920192410 U CN 200920192410U CN 201488811 U CN201488811 U CN 201488811U
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Abstract
The utility model discloses a photosynthetic radiation luminometer which comprises a spectrometer and a broad band radiation probe which are electrically connected with a micro-electronic processing unit; and the spectral sensitivity of the broad band radiation probe is matched with a response curve of a certain photosynthetic radiating system. The spectrometer and the broad band radiation probe are used for simultaneously measuring measured light, an accurate photosynthetic radiation illumination value can be obtained in combination with results measured by the spectrometer and the broad band radiation probe, and an accurate measured light absolute spectral power also can be simultaneously obtained so as to further calculate the photosynthetic radiation illumination quantity under other systems. The photosynthetic radiation luminometer has the advantages of low requirements for the spectrometer and the broad band radiation probe, easy realization, convenient use and higher measurement precision and can simultaneously realize the photosynthetic radiation illumination measurement under a plurality of systems.
Description
[technical field]
The utility model belongs to the optical radiation measurement field, is specifically related to a kind of photosynthetic radiant illumination meter.
[background technology]
Optical radiation is the energy of photosynthesis of plant; affect the output that forms in the photosynthesis process and the quality of product; light is as the energy of a kind of regulating action in addition; also all play an important role to the rate of transformation of reproductive growth to the shape of the development of phytomorph, leaf and size and from nourishing and growing; therefore the measurement of photosynthetically active radiation amount is a plant illumination; plant growth, and an important technology content of environmental protection (greenhouse effect etc.).
Since under the optical radiation of different wave length, photosynthesis of plants effect difference, and therefore photosynthetic radiant illumination is the result of optical radiation spectral irradiance and certain function curve weighting.Difference according to weighting function, the system that represents photosynthetic radiant illumination is also inequality, these systems mainly contain at present: light quantum system and plant radiancy system, photometric system and radiancy system also are used for representing photosynthetic radiant illumination sometimes in addition, the weighted curve of photometric system is the photopic vision luminous efficiency function V (λ) of CIE regulation, and the radiancy system does not have spectral selectivity.The light quantum system explains the common system of photosynthetic radiant illumination at present, and unit is molm
-2S
-1Desired light quantum response function curve is the curve that is directly proportional with wavelength between 400nm-700nm, and fine rule as shown in Figure 1 is designated as desired light quantum response curve.Though the light quantum system has obtained widespread use, effective radiation efficiency of its weighting function and actual photosynthesis effect differs increasing, can not be directly perceived inadequately to the statement of effective radiation.People such as Gilberto J.C.da Costa has the plant radiometry that has proposed based on the RQE curve in recent years, quantum efficiency (RQE) is proposed according to the various plants test findings 1972 by McCree, other scholar's checking and approval have been obtained subsequently, this RQE curve as shown in Figure 2, its wavelength coverage is 3250nm-780nm.Plant radiancy system has overcome some defectives of light quantum system, will obtain fields such as agricultural and obtain large-scale application.
Yet, the present instrument of also not realizing the photosynthetic irradiance measurement under a plurality of systems, this calculates for photosynthetic efficiency of light source and has brought trouble.Also there is more defective even if realize the equipment that individual system is measured.In the light quantum system, light quantum meter with light quantum probe is a major equipment of measuring photosynthetic radiant illumination, the spectrum sensitivity of light quantum probe and the matching degree of desired light quantum response function are to influence the most important factor of measuring accuracy, but accurately coupling is very difficult, as shown in Figure 1, existing light quantum probe often exists bigger spectrum to lose matching error.In the plant radiometry, to use accordingly to have the spectrum sensitivity curve and realize photosynthetic irradiance measurement with the broadband radiation probe that the RQE curve is complementary, there is this spectrum mistake matching problem equally in it.The spectrum of detector loses coupling and can cause measured photosynthetic radiant illumination to exist than mistake, especially when being existed than big-difference by the spectral power distribution of the standard sources of the spectral power distribution of photometry and this optical radiation illuminometer of calibration, measuring error will be very considerable, when therefore measuring photosynthetic radiant illumination under the Different Light irradiation, the horizontal comparability of its measurement result is relatively poor.Spectrometer also is a kind of instrument of measuring photosynthetic radiant illumination, but is subjected to the influence of electrooptical device, and the linear dynamic range of spectrometer is narrower, and other factors, also can influence measurement result as parasitic light, dark noise, and this method measuring accuracy does not reach very high yet.
[utility model content]
The purpose of this utility model is to overcome the above-mentioned problems in the prior art, a kind of photosynthetic radiant illumination meter is provided, can realize the photosynthetic irradiance measurement under a plurality of systems such as light quantum system and plant radiometry system, and higher measuring accuracy, measurement result have higher horizontal comparability.
For achieving the above object, the technical solution used in the present invention is:
A kind of photosynthetic radiant illumination meter, it is characterized in that: comprise a spectrometer that is used for the measure spectrum distribute power, a broadband radiation probe, the relative spectral sensitivity of broadband radiation probe can be complementary with light quantum ideal response function Q (λ), perhaps also can be complementary with the pairing ideal response function R of photosynthesis relative quantum efficient (RQE) (λ); Described spectrometer is electrically connected with microelectronic processing unit, and described broadband radiation probe is that digital signal conversion circuit is electrically connected with described microelectronic processing unit by one with analog signal conversion.Its corresponding measurement method may further comprise the steps:
A) measure by the relative spectral power distribution P of photometry
t(λ), measure by the photosynthetic radiant illumination G of photometry with the broadband radiation probe;
B) by P
t(λ), the relative spectral sensitivity s of known broadband radiation probe
Rel(λ) and the ideal response function that mated of broadband radiation probe, calculate spectrum correction factor K, and K be multiply by G obtain more accurate photosynthetic radiant illumination G
c
Photosynthetic radiant illumination meter of the present utility model combines spectrometer and broadband radiation probe, can realize measuring simultaneously same light source and carry out self-alignment function, the two own measuring accuracy of spectrometer and broadband radiation probe all need not be very high, just can access measuring accuracy very high in the large span dynamic range and easy to use through combination.
The ideal response function curve match mutually of broadband radiation probe and arbitrary photosynthetic radiating system, can obtain under the corresponding system comparatively accurate photosynthetic radiant illumination by spectrum correction factor K.Photosynthetic radiant illumination value under other system can be by being calculated by the absolute spectral radiant power of photometry spectral response functions weighted integral desirable with it.Can directly be obtained by the measurement of spectrometer by the absolute spectral radiant power of photometry, but precision is lower, in the utility model, according to the comparatively accurate photosynthetic radiant illumination G that has obtained
cWith by the relative spectral power distribution P of photometry
t(λ), calculate by the absolute light spectral power of photometry:
Wherein, the ideal response function that F (λ) is mated for the broadband radiation probe, λ
1And λ
2Be respectively the minimum value and the maximal value of F (λ) function wavelength coverage.
Above-mentioned spectrometer is formed rapid spectrometer by entrance slit, grating and detector array.In rapid spectrometer, each picture dot of detector array receives the dispersed light of certain wavelength simultaneously, can realize the measurement to full spectrum in the extremely short time (as Millisecond).
The grating of above-mentioned rapid spectrometer can be plane grating, at this moment, in this spectrometer, on the light path between entrance slit and the grating collimating mirror is set, and also is provided with convergent mirror between grating and detector array.The grating of above-mentioned above-mentioned rapid spectrometer also can be flat filed concave grating, and flat filed concave grating has convergence function, dispersed light can be converged on the detector array.
The mechanical scanning type spectrometer that above-mentioned spectrometer is made up of monochromator and single channel photoelectric sensor.Above-mentioned single channel optoelectronic sensor is connected with described microelectronic processing unit by a signal processing circuit.Mechanical scanning type spectrometer measurement speed is relatively slow, generally at tens seconds between a few minutes.
Be provided with the cosine corrector before the above-mentioned broadband radiation probe, because illumination has cosine distribution, therefore the cosine corrector is set before the broadband radiation probe can measure brightness value more exactly.
In sum, photosynthetic radiant illumination meter of the present utility model can be realized photosynthetic irradiance measurement and luminosity and the radiometry in light quantum system and the plant radiancy system simultaneously, and is easy to use, and by spectrum correction, measurement has higher precision.
[description of drawings]
Accompanying drawing 2 is the pairing ideal response curve of photosynthesis relative quantum efficient (RQE);
Accompanying drawing 3 is a kind of photosynthetic radiant illumination meter structural representation of the present utility model.
[embodiment]
As Fig. 3 is an embodiment synoptic diagram of photosynthetic radiant illumination meter of the present utility model, comprises 1, one broadband radiation probe 2 of a spectrometer and microelectronic processing unit 3.Photosynthesis relative quantum efficient R (λ) shown in the spectral response sensitivity curve of broadband radiation probe 2 and the accompanying drawing 2 is complementary, and it is that digital signal conversion circuit is electrically connected with described microelectronic processing unit 3 that broadband radiation probe 2 is used for analog signal conversion by one.Spectrometer 1 in the present embodiment is by the rapid spectrometer 1 of detector array 1-5 as photoelectric conversion unit.Entrance slit 1-1 from this rapid spectrometer 1 enters by photometry, incide on the collimating mirror 1-2, behind collimation, incide plane grating 1-3, plane grating 1-3 is with the incident light chromatic dispersion and reflex on the convergent mirror 1-4, convergent mirror 1-4 reflexes to dispersed light on the detector array 1-5, each picture dot on the detector array 1-5 receives the optical radiation of certain wavelength to carry out, and can measure fast by the spectral power distribution of photometry.
Using photosynthetic radiant illumination timing of the present utility model, broadband radiation probe 2 and spectrometer 1 are measured simultaneously, and measurement result is input to microelectronic processing unit 3, calculate the photosynthetic radiant illumination under the accurate plant radiometry system.Concrete steps and computing method are as follows:
1) measures by the relative spectral power distribution P of photometry with spectrometer 1
t(λ), measure under the plant radiometry system by the photosynthetic radiant illumination G of photometry with described broadband radiation probe 2
P
2) by the P that records
t(λ), the known relative spectral sensitivity s of photosynthesis relative quantum efficient R (λ) and described broadband radiation probe 2
Rel(λ), calculate spectrum correction factor K and multiply by photosynthetic radiant illumination G under the plant radiometry system that is surveyed
PThe photosynthetic radiant illumination G that obtains revising
C P
The computing formula of spectrum correction factor K is:
P wherein
tThe relative spectral power that (λ) records for described spectrometer distributes,
s
Rel(λ) be the relative spectral sensitivity of described broadband radiation probe,
P
s(λ) be the known spectra distribute power of the standard sources that is used to calibrate described light quantum broadband radiation probe,
The pairing ideal response function of R (λ) photosynthesis relative quantum efficient (RQE).
According to the photosynthetic radiant illumination G under the plant radiometry system of above-mentioned correction
C PWith by the relative spectral power distribution P of photometry
t(λ), calculate by the absolute light spectral power of photometry:
Use absolute spectral radiant power to calculate photosynthetic radiant illumination under the light quantum system:
Wherein Q (λ) is a light quantum ideal response function.
Use the illumination under the absolute spectral radiant power calculating photometric system:
Use absolute spectral radiant power to calculate irradiance under the radiancy system:
Claims (4)
1. photosynthetic radiant illumination meter, it is characterized in that: comprise a spectrometer (1) that is used for the measure spectrum distribute power, a broadband radiation probe (2), the relative spectral sensitivity of broadband radiation probe (2) and light quantum ideal response function Q (λ) are complementary, and perhaps the relative spectral sensitivity of broadband radiation probe (2) and the pairing ideal response function R of photosynthesis relative quantum efficient (RQE) (λ) are complementary; Described spectrometer (1) is electrically connected with microelectronic processing unit (3), and described broadband radiation probe (2) is electrically connected with described microelectronic processing unit (3).
2. photosynthetic radiant illumination meter according to claim 1 and 2 is characterized in that: spectrometer (1) includes the rapid spectrometer (1) of entrance slit (1-1), grating (1-3) and detector array (1-5).
3. photosynthetic radiant illumination meter according to claim 1 and 2 is characterized in that: spectrometer (1) includes the mechanical scanning type spectrometer of monochromator and single channel photodetector.
4. photosynthetic radiant illumination meter according to claim 1 and 2 is characterized in that: broadband radiation probe (2) is preceding to have cosine corrector (2-1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201924105U CN201488811U (en) | 2009-09-07 | 2009-09-07 | Photosynthetic radiation luminometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201924105U CN201488811U (en) | 2009-09-07 | 2009-09-07 | Photosynthetic radiation luminometer |
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| CN201488811U true CN201488811U (en) | 2010-05-26 |
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| CN2009201924105U Expired - Fee Related CN201488811U (en) | 2009-09-07 | 2009-09-07 | Photosynthetic radiation luminometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115675A (en) * | 2013-01-21 | 2013-05-22 | 中国计量学院 | Method and illuminometer of measuring illuminance of human body biological clock effect |
| CN104101428A (en) * | 2014-06-25 | 2014-10-15 | 杭州中为光电技术股份有限公司 | Photometric module, handheld photometer and measuring method thereof |
-
2009
- 2009-09-07 CN CN2009201924105U patent/CN201488811U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115675A (en) * | 2013-01-21 | 2013-05-22 | 中国计量学院 | Method and illuminometer of measuring illuminance of human body biological clock effect |
| CN104101428A (en) * | 2014-06-25 | 2014-10-15 | 杭州中为光电技术股份有限公司 | Photometric module, handheld photometer and measuring method thereof |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: HANGZHOU EVERFINE OPTOELECTRONIC INFORMATION CO., Free format text: FORMER NAME: HANGZHOU EVERFINE PHOTO-E-INFO CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 310053 Binjiang District, Zhejiang Province, Hangzhou Road, No. 669 Patentee after: Hangzhou Everfine Photo-E-Info Co., Ltd. Address before: 310053 Binjiang District, Zhejiang Province, Hangzhou Road, No. 669 Patentee before: Hangzhou Everfine Photo-E-Info Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20180907 |