Standing wave radar state detection device

Abstract

The invention provides a standing wave radar state detection device. A DC component is removed from the intensity distribution of the number of cycles of a composite wave detected by a standing wave in a distance spectrum arithmetic unit, and conversion is performed to obtain a distance spectrum. In a difference detector, a distance spectrum difference is calculated by subtracting a reference time distance spectrum from the distance spectrum, and a difference distance spectrum over time is calculated. The tip intensity of the differential distance spectrum of the detector changes according to the change of the dielectric constant of the measurement object. Therefore, the state before freezing is detected by reducing the moisture occupancy of the food material to be measured. The controller controls the food material so as to be in a non-frozen state on the basis of the pre-freezing state detected by the detector. Therefore, it is possible to detect changes over time in the moisture or the like of a measurement object, to maintain freshness of food, to find abnormal parts of a human body, to detect the activity of plants, to detect the amount of sweat of a person, and the like.

Description

Technical field[0001]The present invention is a state detecting device using a stand-in-wave radar at the same time to detect the distance between the measurement object.Background technique[0002]Before this, because of the care providers, the caregiver was not allowed to monitor the illness in diaper in the bed. Therefore, the caregiver in order to eliminate the feeling of being uncomfortable to keep cleaning, it can only regularly check the diaper that is seen in the case of the nurse. Moreover, in order to check the degree of drying of the laundry after the cleaning, it can only be checked during the drying of the laundry cleaning. Therefore, the moisture change of the coating continuity cannot be detected, more unable to remotely and over time, the state of the moisture content in the target is detected.[0003]In Patent Document 1, the radio wave sensor transmits an electric wave to the road surface, and the reflective wave of the reflecting surface is received by the above-descr...

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Problems solved by technology

[0005] However, the technique of this patent document 1 uses microwave pulse signals, and the time from transmitting radio waves to receiving radio waves is used as the basis to obtain the distance to the reflecting surface.

As mentioned above, considering the speed of the microwave, if the radio wave sensor is not installed at a higher position (such as 10 meters) above the road, it will not be able to receive the reflected wave. In short, there are some problems: such as outdoors When the radio wave sensor is installed in a place where it is necessary to have a rich space at a higher position

However, due to the delay in the radio wave front, it cannot be accurately detected

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