Relative humidity sensor for marine meteorological elements

Abstract

The invention is directed at the problem that relative humidity sensors for land meteorological elements hardly adapt to high humidity, high salt mist and high corrosion of a marine environment and brings forward a relative humidity sensor for marine meteorological elements. According to the invention, a high precision humidity sensitive element is employed, and the variation of relative air humidity is converted into a frequency signal through a frequency generation circuit; then the frequency signal is converted into a voltage signal through a frequency voltage converting circuit; a linearization conditioning circuit carries out linearization treatment on changed voltage signals so as allow variation of voltage to linearizedly correspond to variation of relative air humidity; and adaptability of the relative humidity sensor for marine meteorological elements to a marine environment is achieved through a special structure and a reliable design. According to testing results, the relative humidity sensor for marine meteorological elements has the advantages of high measurement precision, good linearization performance and capacity of adapting to a marine environment.

Description

technical field [0001] The invention relates to a sensor, in particular to a relative humidity sensor for marine meteorological elements. Background technique [0002] In the ground meteorological observation specification, air humidity refers to the air humidity at the specified height of surface meteorological observation. The instruments or sensors for measuring humidity mainly include shutter dry bulb and wet bulb thermometers, hair hygrometers, ventilation psychrometers, hygrometers, Humidity capacitive humidity sensor. [0003] The psychrometer is an instrument used to measure the temperature and humidity of the air. It consists of two identical thermometers, the air temperature is measured by the dry bulb thermometer, and the humidity is calculated from the temperature difference between the dry bulb thermometer and the wet bulb thermometer based on thermodynamic principles. The thermometer is made according to the characteristics of mercury (alcohol) thermal expans...

AI Technical Summary

Problems solved by technology

The instrument has the following shortcomings: the metal part is easily damaged, the ventilation motor is easily damaged due to long-term rotation, the wet ball gauze needs to be kept clean, and the sensor is easy to freeze and crack when the temperature is 0°C

The former are generally general-purpose relative humidity sensors developed for relative humidity measurement. The output accuracy is relatively low, and the output signal is only a physical quantity related to humidity (such as capacitance). Even if the output is a voltage signal, it is generally Small signal needs to be further amplified and linearized

The latter instruments applicable to the relative humidity measurement of meteorological elements are all developed and produced for the terrestrial environment. As mentioned above, the existing terrestrial relative humidity sensors are difficult to adapt to the high humidity, high salinity and high corrosion environment of the ocean.

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