foreword
photosynthesis, the process by which green plants use the sunlight energy to assimilate carbon dioxide (co2) and water (h2o) to produce organic matter and release oxygen, is an important mechanism for plants to exchange nutrients. in the research of modern agricultural science, the photosynthesis of plants is detected by the plant photosynthesis meter, which is helpful to study the growth and physiological characteristics of plants, and is an important basic condition for the high yield and quality of agricultural crops.
principle of photosynthesis tester
plant photosynthesis is the synthesis of organic matter by plants that absorb carbon dioxide in the air and moisture absorbed by plant roots, the energy provided by sunlight and the chloroplasts of the leaves. the faster the rate of photosynthesis, the better the growth of the plant. therefore, the rate of photosynthesis has become an important basis for indicating the growth of plants. so how to measure the rate of photosynthesis? there are many methods to determine the photosynthetic rate, but the most widely used is to determine the photosynthetic rate based on the absorption of co2. the co2 absorption method is widely used because of its reliable theory and high sensitivity. it can measure samples in real time and non-destructively. the modern portable plant photosynthesis analyzer integrates a notebook computer and a gas analyzer. it uses the powerful calculation function and storage function of a computer to combine non-diffusion infrared co2 analysis, temperature and humidity sensors, and light sensors. it can photosynthesize, breath, and transpiration plants. indicators are measured and calculated.
application analysis of mini air pump in measuring instrument
1. the role of the micro air pump in the photosynthesis meter is to collect the gas around the plant, and then the photosynthesis meter further analyzes and calculates the photosynthetic rate through changes in co2 concentration, temperature and humidity.
2. the stable air flow of the micro air pump is an important condition to ensure the accuracy of the measuring instrument. most portable measuring instruments use lithium batteries for power supply, and one of the characteristics of the battery is that during the discharge process, the battery voltage will gradually decrease as the capacity decreases. in this case, the speed and torque of the micro-pump motor will also decrease with the voltage drop, so it will cause the pump flow and load capacity to change. in this usage scenario that requires constant flow, we need to add a voltage regulator circuit in the power supply circuit, or choose a miniature pump with a built-in voltage regulator circuit.
3. in addition, the tolerance of the micro air pump to complex media is also crucial. e.g. in the process of collecting photosynthesis meter in the field, complex media such as high humidity will inevitably appear.
products recommended
c15l micro vacuum pump
brief description: dc brushless motor, fiber reinforced nylon and epdm rubber material, power supply range: dc3.2-6v (flow rate does not change with voltage value change), pwm speed control, relative vacuum degree -36kpa or more, glass rotor flowmeter test flow: greater than 1l/min, soap film flowmeter test flow: greater than 0.56l/min, the suction port can be full load, but the exhaust port must be unobstructed.
advantages: long life (the continuous working life of the full-load of the quality version is more than 10000h), built-in voltage-stabilized power module, stable output flow, small size, compatible with complex corrosive media.
d15l micro pressure pump
brief description: dc brushless motor, fiber reinforced nylon and epdm rubber material, power supply range: dc3.2-6v (flow does not change with voltage value), pwm speed control, relative vacuum degree above -18kpa, maximum output pressure 22kpa above, the test flow rate of the glass rotor flowmeter: greater than 0.4l/min, the test flow rate of the soap film flowmeter: greater than 0.4l/min, both the suction port and the exhaust port can be fully loaded.
advantages: long life (the continuous working life of the full-load of the quality version is more than 10000h), built-in voltage-stabilized power module, stable output flow, small size, compatible with complex corrosive media.
c09 micro gas pump
brief description: dc brushless motor, sps and epdm rubber material, three-chamber pump, power supply voltage: dc24v, various speed control modules (pwm, frequency and knob speed adjustment type), relative vacuum degree -37kpa, glass rotor flowmeter test flow: 1.5-2l/min or more, soap film flowmeter test flow: 1.3-2l/min or more, the suction port can carry a large load, but the exhaust port must be unobstructed.
advantages: long life (the continuous working life of the quality version can reach more than 5500h), three-chamber pump, stable output flow, multi-function speed regulation, small size, compatible with corrosive complex media.
