US 11,874,219 B2
In-situ detection device for detecting water and fertilizer content in crop cultivation substrate and detection method thereof
Bin Liang, Qingdao (CN); Baogang Xu, Weifang (CN); and Lianfa Xu, Weifang (CN)
Assigned to Qingdao Agricultural University, Qingdao (CN); Shandong Huijinhai Wisdom Agricultural Research Institute Co., Ltd., Weifang (CN); and Weifang Huijinhai Internet of Things Technology Co., Ltd., Weifang (CN)
Filed by Qingdao Agricultural University, Qingdao (CN); Shandong Huijinhai Wisdom Agricultural Research Institute Co., Ltd., Weifang (CN); and Weifang Huijinhai Internet of Things Technology Co., Ltd., Weifang (CN)
Filed on Oct. 30, 2021, as Appl. No. 17/452,989.
Claims priority of application No. 202011206422.6 (CN), filed on Nov. 3, 2020.
Prior Publication US 2022/0136958 A1, May 5, 2022
Int. Cl. G01N 21/25 (2006.01); G01F 23/30 (2006.01); G01N 1/14 (2006.01); G01N 21/01 (2006.01); G01N 33/24 (2006.01)
CPC G01N 21/25 (2013.01) [G01F 23/30 (2013.01); G01N 1/14 (2013.01); G01N 21/01 (2013.01); G01N 33/24 (2013.01); G01N 2033/245 (2013.01); G01N 2201/0633 (2013.01); G01N 2201/06113 (2013.01)] 3 Claims
OG exemplary drawing
 
1. An in-situ detection device for detecting water and fertilizer content in a crop cultivation substrate, wherein the in-situ detection device comprises a water and fertilizer in-situ collector and a spectral analysis device; the water and fertilizer in-situ collector is pre-buried in the crop cultivation substrate and used to collect water and fertilizer in the crop cultivation substrate in real time to obtain a measurement sample; the spectral analysis device is used to emit a laser with a specific wavelength to detect and analyze content of nitrogen, phosphorus, and potassium in the measurement sample collected by the water and fertilizer in-situ collector; and a continuous sampling system for continuously transporting the measurement sample is provided between the water and fertilizer in-situ collector and the spectrum analysis device;
wherein the water and fertilizer in-situ collector comprises a water and fertilizer collection box and a water and fertilizer storage box; a communicating pipe is provided between the water and fertilizer collection box and the water and fertilizer storage box; the water and fertilizer collection box is used to collect water and fertilizer in the crop cultivation substrate in real time, to obtain the measurement sample; and the measurement sample is transported into the water and fertilizer storage box through the communicating pipe;
wherein a top collection port of the water and fertilizer collection box is provided with a filtration and permeation layer for filtering soil of the crop cultivation substrate; and a float liquid-level-detection switch is arranged in the water and fertilizer storage box;
wherein the spectrum analysis device comprises a laser light source; the laser light source is connected with a multi-mode laser splitter by a quartz fiber; the multi-mode laser splitter is installed with two light source circuits; and the two light source circuits comprise a measurement reference light-source-circuit and a measurement sample light-source-circuit;
wherein the multi-mode laser splitter splits laser emitted by the laser light source into a measurement reference laser-beam and a measurement sample laser-beam; the measurement reference laser-beam is transmitted along the measurement reference light-source-circuit and the measurement sample laser-beam is transmitted along the measurement sample light-source-circuit;
wherein, the measurement reference light-source circuit comprises a first collimator lens; a reference photodetector is arranged at a side of the first collimator lens, and the reference photodetector and the first collimator lens are spaced apart; and a reference transmittance cuvette is arranged between and spaced apart from the first collimator lens and the reference photodetector;
wherein the measurement sample light-source-circuit comprises a second collimator lens; a sample photodetector is arranged at a side of the second collimator lens, and the sample photodetector and the second collimator lens are spaced apart; and a sample transmittance cuvette is arranged between and spaced apart from the second collimator lens and the sample photodetector;
wherein the continuous sampling system comprises a first peristaltic pump and a second peristaltic pump; a liquid inlet end of the first peristaltic pump is communicated with the water and fertilizer storage box, and a liquid outlet end of the first peristaltic pump is communicated with a liquid inlet of the sample transmittance cuvette; a liquid inlet end of the second peristaltic pump is communicated with a reference sample pool, and a liquid outlet end of the second peristaltic pump is communicated with a liquid inlet of the reference transmittance cuvette.