42 results about "Photon flux density" patented technology

The present invention provides a method for stimulating plant growth, which comprises: (a) placing a light transmissive material for adjusting or retaining light spectrum wavelengths below 500 nm (section A), between 500~630 nm (section B), and above 630 nm (section C) between the light and a photosynthesis receptor of the plant; and (b) providing the illuminance or photon flux density of section B lower than that of section A or section C after the light passing through the light transmissive material. The present invention also provides an apparatus and methods for computing cumulative light quantity, comprising (a) a spectrum sensing unit; (b) a spectrum multi-band setting module; (c) a cumulative light quantity computing module; (d) an information processing unit; and (e) a control unit.

The invention discloses an optimal light quality and photon flux density-based light requirement real-time dynamic obtaining method. The method comprises the steps of firstly performing modeling based on a photosynthetic rate of a GA-GRNN, and optimizing an expansion speed of a GRNN by utilizing a GA algorithm, wherein related analysis of a predicted value and an actually measured value of a photosynthetic rate prediction model of the GA-GRNN is remarkably superior to that of a GRNN model; and then based on the photosynthetic rate prediction model of the GA-GRNN, performing photosynthetic rate optimization by using a quantum genetic algorithm to obtain corresponding optimal light quality and photon flux density, and building a light environment control target value model by adopting multiple linear regression fitting, wherein determination coefficients of optimal light quality model and photon flux density model are 0.992 and 0.9893 respectively. The photosynthetic rate at each temperature is taken as the actually measured value, and the photosynthetic rate corresponding to the optimal light quality and the optimal photon flux density is taken as the predicted value; a related analysis method is adopted; the determination coefficient is 0.936, the fitting straight slope is 1.012, and the intercept is 0.054; and a result shows that the built coupled light quality and photon flux density control target value model is good in performance.

The invention relates to a fish swarm algorithm-based cucumber seedling stage carbon dioxide optimization regulation and control model. A model formula is put forwards with temperature T and photon flux density PFD adopted as independent variables and with carbon dioxide concentration corresponding to a maximum photosynthetic rate adopted as a dependent variable; the establishment and application of the model are also disclosed. Multi-dimensional data are acquired by using a photosynthetic rate multiple-factor nested experiment; a photosynthetic rate multivariable nonlinear regression model is constructed; a fish swarm algorithm-based carbon dioxide model optimization method is designed; carbon dioxide saturation points under different temperature and different photon flux density are obtained; and the cucumber carbon dioxide optimization regulation and control model with the carbon dioxide saturation points adopted as target values can be built. As indicated by model verification test results, the fish swarm algorithm-based cucumber seedling stage carbon dioxide optimization regulation and control model of the invention can dynamically obtain the carbon dioxide saturation points under different temperature and different photon flux density, the determination coefficient of the actually-measure values and calculated values of the carbon dioxide saturation points is 0.98, and the maximum relative error of the actually-measure values and calculated values of the carbon dioxide saturation points is lower than 3%, and the model has high precision and is of great significance for the improvement of the carbon dioxide environmental regulation and control efficiency of facilities.

The present invention provides a method for stimulating plant growth, which comprises: (a) placing a light transmissive material for adjusting or retaining light spectrum wavelengths below 500 nm (section A), between 500˜630 nm (section B), and above 630 nm (section C) between the light and a photosynthesis receptor of the plant; and (b) providing the illuminance or photon flux density of section B lower than that of section A or section C after the light passing through the light transmissive material. The present invention also provides an apparatus and methods for computing cumulative light quantity, comprising (a) a spectrum sensing unit; (b) a spectrum multi-band setting module; (c) a cumulative light quantity computing module; (d) an information processing unit; and (e) a control unit.

The invention relates to an integrated intelligent plant characteristic spectrum dodging LED light source and a packaging method. The light source adopts an integration packaging technology and blue,white and red LED chips are packaged into one luminescence unit according to different radiation power ratios. Radiation intensity of each type of LED chips can be individually adjusted. Through an intelligent multichannel constant current driving chip and a MCU control circuit, based on a cultivated plant demand, a radiation spectrum is emitted according to a photosynthesis photon flux density (PPFD) corresponding to a characteristic spectrum of a specific cultivated plant so as to carry out illumination according to the characteristic spectrum of the specific plant. The pectrums generated byillumination systems formed by the plurality of LED light sources irradiate the consistent space so that a disadvantage that space distribution of plant characteristic spectrums generated by other modes of light sources is inconsistent is overcome, a luminous energy utilization rate is maximized and benefits can be maximized. In the invention, an ideal illumination device can be provided for scientific research and production of modern agriculture, such as an urban farm, a phytotron, greenhouse seedling and the like.

The invention discloses a microchannel plate-based modulated X-ray generation device and method. The microchannel plate-based modulated X-ray generation device comprises a photocathode, a microchannelplate, two mesh electrodes, an anode target, a vacuum system and a high-voltage power supply, wherein a front plate and a back plate of the microchannel plate provide deflection voltage; the back plate of the microchannel plate and one mesh electrode form a field-free region; the mesh electrode and the other mesh electrode form an uniform electric field; the anode target is used for bombarding electrons accelerated by the uniform electric field and then generating X-rays; the photocathode, the microchannel plate, the mesh electrodes and the anode target are arranged in the vacuum system; thehigh-voltage power supply provides the microchannel plate, the mesh electrodes and the anode target with electricity; and modulation of the X-rays is achieved through adjusting the deflection voltage,the uniform electric field and voltage of the anode target. According to the microchannel plate-based modulated X-ray generation device and method, large-area array modulated X-rays with large dynamic ranges and uniform photon flux density can be generated.

The invention discloses a vital algae quick detection device for ballast water and a detection method of the vital algae quick detection device, relates to the technical field of detectors, and aims to solve the technical problem on detection of the activity of algae in the ballast water. The device comprises a sample chamber, wherein a sample basin is arranged in the sample chamber; an excitationlight source is arranged on each of the left and right sides of the sample chamber; emergent light axes of the two excitation light sources are intersected at the sample basin; one of the excitationlight source is a pulse excitation light source, and the other excitation light source is a saturated excitation light source; the photon flux density of emergent light rays of the pulse excitation light source is 0.1 to 1 micromole photon per square second; the photon flux density of emergent light rays of the saturated excitation light source is 2,000 to 4,000 micromole photon per square second;a photoelectric receiver for receiving the emergent light rays of the sample chamber is arranged in front of a light emergent window of the sample chamber. The device and the method which are provided by the invention can quickly detect the activity of the algae in the ballast water.

The invention relates to an improved fish swarm algorithm-based tomato seedling photosynthesis optimization regulation and control model. According to the model, with temperature T adopted as an independent variable and photon flux density (PFD) corresponding to a light saturation point adopted as a dependent variable, a model formula is put forward. The invention also discloses an establishment method and application of the model. According to the establishment method of the model, multidimensional data are obtained through utilizing a photosynthetic rate double-factor nested test; a temperature and photon flux density coupled photosynthetic rate multivariate nonlinear regression model is constructed; an improved fish swarm algorithm-based photosynthetic rate model optimization method is designed, so that a light saturation point under different temperature conditions is obtained; and the tomato photosynthetic optimization regulation and control model with the light saturation point adopted as a target value is established. As indicated by the result of a model verification test, the light saturation point under different temperature conditions can be dynamically acquired; the determination coefficient of the actual measurement value and calculated value of the light saturation point is 0.967, and the maximum relative error of the actual measurement value and calculated value of the light saturation point is smaller than 2%, and the regulation and control model has high accuracy and has great significance for improving the regulation and control efficiency of light environment of facilities.

A method for increasing efficiency of a method for producing astaxanthin by culturing a microalga. A method for producing astaxanthin in which astaxanthin is produced in an algal body by culturing a microalga, wherein photoirradiation is performed using both a blue LED of peak wavelength from 420 to 500 nm and a red LED of peak wavelength from 620 to 690 nm, at least during an astaxanthin-producing culturing phase of a culturing period. The ratio of the blue LED of peak wavelength from 420 to 500 nm and the red LED of peak wavelength from 620 to 690 nm is preferably from 1:19 to 19:1 by photon flux density, and the photon flux densities are each preferably not less than 20 μmol/m²/s.

The invention provides a method for using an LED light source to lower nitrate content in leaf vegetables. The method includes making an LED irradiating unit by utilizing blue-light, red-light and infrared-light LEDs different in wavelength and photon flux density value according to a lamp number proportion of 5:3:2 (blue light, red light and infrared light); 7-10 days before harvesting of the leaf vegetables like flowering cabbage, lettuce and spinach, using the LED irradiating unit to irradiate places being 50-100cm above plants within a time period from 22:00 to 2:00 for four hours each day for supplementary lighting. By the method, the nitrate content in harvested organs can be lowered in an extremely obvious manner, damage to human body due to the fact that the nitrate content in the leaf vegetables exceeds a safe standard can be prevented, and a novel technique is provided for guaranteeing quality safety of harmless vegetables.

The present invention relates to a secondary proliferation culture method of color osmanthusfragrans test-tube plantlets. The method comprises: adopting the newly-germinating shoots of the color osmanthusfragrans as the explants, carrying out disinfection sterilization on the explants, cutting into the small segments with the length of 1-1.5 cm under a sterile condition, inoculating into an axillary bud induction culture medium, culturing for 4-5 weeks to produce axillary buds, cutting the axillary buds into the terminal bud or stem segment with the length of 1-1.5 cm, and inoculating into the same culture medium to carry out secondary proliferation culture for 4-5 weeks to obtain the clustered shoots, wherein the culture process is performed under the conditions of the lighting time of 14 h each day, the photosynthetically active photon flux density of 40-50 [mu]mol/m<2>.s and the temperature of 24-26 DEG C, the axillary bud induction culture medium comprises a base culture medium, 0.1-0.5 mg/L of TDZ, 0.1-1.0 mg/L of KT, 5.5 g/L of agar, and 30 g/L of white granulated sugar, and the pH value is adjusted to 5.8. The secondary proliferation culture method of the present invention has characteristics of rapid breeding and no limitation of the season change on the production. In addition, the defects of the cutting seedlings are effectively overcome.

The invention provides a layered optical measuring method of a fruit tree vertical structure and a device. Firstly, the ratio of photon flux densities of the fruit trees to environmental photon flux densities can be calculated by photon sensors arranged at different horizontal layers and aiming to different incident directions of sunlight and arranged at equal intervals in a line on different positions on the same horizontal layers, and therefore the incident light transmission rates on any photon positions can be acquired respectively; and then the incident light transmission rates and leaf angle distribution extinction coefficient are input in a light distribution model, and the leaf area indexes of the fruit trees on any photon positions are output; and finally by using a spatial interpolation method, based on the leaf area indexes, the leaf area distribution results on different horizontal layers are acquired, and therefore the leaf area distribution result of the fruit tree vertical structure can be acquired. The invention is advantageous in that based on the leaf area distribution result of the fruit tree vertical structure, the optimized assessment of the optical distribution and the optical utilization rate of the fruit tree structure is carried out, and therefore the scientific data support can be provided for fruit tree trimming or the fruit tree shape optimization.

A method of cultivating algal cells of an algae belonging to a class selected from Chlorophyceae, Euglenophyceae, Bacillariophyceae and Haptophyceae includes: irradiating the algal cells with an artificial light having a ratio of (i) photon flux density in a wavelength range of 520-630 nm to (ii) photosynthetic photon flux density, that is 65% or more; and measuring a condition of the algal cellsand/or a condition of an algal cell culture provided by cultivating the algal cells. Irradiation and non-irradiation of the algal cells with the artificial light are switched, or the photon flux density in the wavelength range of 520-630 nm is changed, according to the measured condition of the algal cells and/or the measured condition of the algal cell culture.

In operation of a photon counting detecting system (10), a number of pulse counts output by least one pixel (20) of a photon counting detector in response to experiencing a photon flux density during a sample interval is acquired and a photon flux density (46) or value related thereto corresponding to the pulse counts output by the pixel (20) is determined. A correction (48) for the thus determined photon flux density (46) or value related thereto is determined. A corrected number of pulse counts (52) is determined for the pixel (20) as a function of the thus determined corrected photon flux density value or value related thereto. An image can be displayed that is a function of the corrected number of pulse counts for pixels of the system.

The invention relates to a device for improving disease resistance of plants. The device comprises a light intensity sensor and a light source; the light intensity sensor is used for detecting photon flux density of photosynthetically active radiation for the surface of a plant; the light source is used for emitting red light; if the photon flux density of photosynthetically active radiation is less than a preset threshold, the red light of predetermined intensity is used to irradiate the plant. The device is characterized in that the predetermined threshold is 30Mumol/m<-2>/s<-1>, and the predetermined intensity of the red light is 0 to 200Mumol/m<-2>/s<-1>. The invention further relates to a method for improving the disease resistance of plants. The red light generated by the artificial light source to irradiate the plants, and loss caused by disease damage can be effectively reduced; the method is environment friendly, resistance of the plants can be enhanced just with light of relatively low intensity, and biomass and yield of the plants are increased further.

The present invention provides a device (1) for detecting contamination with a photosynthesis inhibitor, the device including a collection device (10) configured to collect a test liquid, a light-blocking pretreatment tank (21) configured to store the test liquid (2) collected by the collection device in a state of containing phytoplankton, a stirring device configured to maintain a floating state of the phytoplankton in the test liquid stored in the pretreatment tank, an irradiation light source configured to irradiate the phytoplankton in the test liquid stored in the pretreatment tank with weak light having an underwater photon flux density that does not cause photoinhibition, a drainage conduit (40) configured to allow the test liquid discharged from the pretreatment tank to flow thereinto, and a fluorescence quantum efficiency measuring machine (50) provided for the drainage conduit and configured to measure a fluorescence quantum efficiency of the phytoplankton in the test liquid discharged from the pretreatment tank, and a method for detecting contamination with a photosynthesis inhibitor, the method including a liquid supply step, a storing and weak-light irradiation step, and a fluorescence quantum efficiency measurement step.