The effective radiant meter is defined as the ratio (%) of the amount of solar radiation at a measurement point to the amount of radiation at a control point in the time range. For example, to study the light distribution characteristics of the plant canopy, the control point must be located at the upper boundary of the canopy. When the effective plurogram is used to study the light distribution in the horticultural facilities (greenhouses, plastic greenhouses), the control point should be set at Outdoor open space. The range of relative radiation applications is wide enough to meet the needs of most studies, and it does not require the production of a standard curve, which is simple and easy to implement.
The light pipe is made of a transparent hardened glass test tube with a diameter of 15 to 20 mm and a length of 150 to 250 mm as a material for the preparation of the light pipe. About 50mm from the bottom of the test tube, toward the _l: leaving a circular light window of about 3Omm, used to receive solar radiation, the remaining part of the effective calibrator test tube paint, do not allow light to penetrate. The more accumulated solar radiation received by the photometric solution during photometry, the less remaining oxalic acid. Therefore, the cumulative sun axis shot volume is inversely proportional to the amount of potassium permanganate titration.
Use a dark box to bring the photometric tube filled with the photometric solution to the measurement site. If the total amount of radiation is measured, the photometric tube can be placed at each measurement point on the night before the measurement of the effective photometry meter or before the sunrise on the measurement day and retrieved after sunset. It is also possible to flexibly determine the time for placing and retrieving the light pipe according to different measurement items. 5ml photometric solution is taken from a photometric tube in a 100ml conical flask, 50ml of ion-free water (about 70°C water temperature) and 5m125% sulfuric acid solution are added, and a pre-formulated 0.05N potassium permanganate solution is used under a constant temperature water bath at 70°C. Titrate until pink appears.
The active integrator with self-recording device checks the working status of the instrument from time to time, and the instrument without self-recording needs to observe it at regular intervals. Calculate the cumulative amount of solar radiation within the time range synchronized with each batch of photometric tubes, and measure the amount of potassium permanganate (ml) used when titrating batches of photometric tubes for the observed cumulative radiation dose with the corresponding illumination time. Regression analysis yields the quantitative relationship between the two.
The light pipe is made of a transparent hardened glass test tube with a diameter of 15 to 20 mm and a length of 150 to 250 mm as a material for the preparation of the light pipe. About 50mm from the bottom of the test tube, toward the _l: leaving a circular light window of about 3Omm, used to receive solar radiation, the remaining part of the effective calibrator test tube paint, do not allow light to penetrate. The more accumulated solar radiation received by the photometric solution during photometry, the less remaining oxalic acid. Therefore, the cumulative sun axis shot volume is inversely proportional to the amount of potassium permanganate titration.
Use a dark box to bring the photometric tube filled with the photometric solution to the measurement site. If the total amount of radiation is measured, the photometric tube can be placed at each measurement point on the night before the measurement of the effective photometry meter or before the sunrise on the measurement day and retrieved after sunset. It is also possible to flexibly determine the time for placing and retrieving the light pipe according to different measurement items. 5ml photometric solution is taken from a photometric tube in a 100ml conical flask, 50ml of ion-free water (about 70°C water temperature) and 5m125% sulfuric acid solution are added, and a pre-formulated 0.05N potassium permanganate solution is used under a constant temperature water bath at 70°C. Titrate until pink appears.
The active integrator with self-recording device checks the working status of the instrument from time to time, and the instrument without self-recording needs to observe it at regular intervals. Calculate the cumulative amount of solar radiation within the time range synchronized with each batch of photometric tubes, and measure the amount of potassium permanganate (ml) used when titrating batches of photometric tubes for the observed cumulative radiation dose with the corresponding illumination time. Regression analysis yields the quantitative relationship between the two.
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