DEVICE FOR REMOTE CONTROL OF SOIL MOISTURE AND TEMPERATURE Russian patent published in 2018 - IPC G01N25/56 G01K13/00 G01N27/22 G01N33/24 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measuring technology and can be used as a part of the soil condition monitoring system at an agronomic site. Device for remote monitoring of humidity and soil temperature includes a power supply unit, a data processing unit and connected environmental sensors and a transmitting unit. Data processing unit is designed as a main controller with an integrated analog-to-digital converter, the environment parameter sensors are configured as a digital temperature sensor and at least one capacitance humidity sensor. New components of the device, which are a power controller connected to the power supply unit, a key, a pulse converter and a linear converter whose output is connected to capacitance humidity sensors, are connected in series, the output of the pulse converter is connected to a digital temperature sensor, a main controller and a transmitting unit, and the output of the main controller is connected to the control input of the power controller. Capacitance humidity sensor includes a high-frequency generator connected to a measuring and compensation circuit, a differential amplifier and an inverting amplifier. Measuring circuit comprises a measuring capacitor whose capacitance depends on the soil moisture and a first amplitude detector, the compensation circuit comprising a tuning capacitor and a second amplitude detector, the outputs of the amplitude detectors are connected to the inputs of the differential amplifier, whose output through the inverting amplifier is connected to the input of the analog-to-digital converter of the main controller.

EFFECT: higher accuracy of obtained results.

1 cl, 2 dwg