Indoor relative humidity on-line monitoring system and humidity calculation method

A relative humidity and monitoring system technology, applied in measuring devices, material analysis using sound waves/ultrasonic waves/infrasonic waves, instruments, etc., can solve problems such as low precision, inability to realize remote monitoring, and inability to realize real-time online monitoring

Inactive Publication Date: 2013-10-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

[0009] In view of the problems mentioned in the background technology that the commonly used indoor humidity detection devices have low precision, small measurement r...

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  • Indoor relative humidity on-line monitoring system and humidity calculation method
  • Indoor relative humidity on-line monitoring system and humidity calculation method
  • Indoor relative humidity on-line monitoring system and humidity calculation method

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Embodiment Construction

[0057] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0058] figure 1 It is a schematic diagram of the indoor relative humidity online monitoring system provided by the present invention. figure 1 Among them, the system includes two acoustic measurement devices, signal conditioner, power amplifier, data acquisition card, sound card and main control machine; the acoustic measurement device includes electric speaker 2, microphone 3, temperature sensor 4, pressure sensor 5 and Junction box; the power amplifier, microphone 3, temperature sensor 4 and pressure sensor 5 are respectively connected to the input of the junction box; the output of the junction box is connected to the signal conditioner and the electric speaker 2 respectively; the signal The conditioner, the data ...

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Abstract

The invention discloses an indoor relative humidity on-line monitoring system and a humidity calculation method in the field of environment index monitoring. A sound wave measurement system consisting of an electric loudspeaker, a microphone, a temperature sensor and a pressure sensor is arranged on each of opposite wall surfaces indoor; the electric loudspeaker on one side sends a sound signal; the sound signal is detected by the microphone on the same side; then the sound signal is received by the microphone on the opposite wall surface indoor; the received sound signal is converted into a voltage signal; after being input into a signal conditioner through a cable, the voltage signal enters a data acquisition card so as to be converted into a digital signal; the sound wave transmission time is calculated by a time delay algorithm; and therefore, the indoor transmission speed of a sound wave can be calculated. Furthermore, the indoor temperature and the indoor pressure are detected by probes of the pressure sensor and the temperature sensor which are arranged on two wall bodies. Finally, the indoor relative humidity is calculated through a main control machine. The indoor relative humidity on-line monitoring system can accurately measure the whole indoor average humidity in real time and record the change of the indoor humidity in real time.

Description

technical field [0001] The invention belongs to the field of environmental index monitoring, and in particular relates to an indoor relative humidity online monitoring system and a humidity calculation method. Background technique [0002] At present, there are many measurement methods for indoor relative humidity, generally there are the following: [0003] 1. Double pressure method, double temperature method: This method is based on the thermodynamic P, V, T balance principle, and the balance time is relatively long. The split flow method is based on the precise mixing of absolute humidity and absolute dry air. These devices can be made quite precise, but because the equipment is complicated and expensive, and the operation is time-consuming and labor-intensive, it is mainly used for standard measurement. [0004] 2. Saturated salt method: the most common method in humidity measurement, simple and easy to implement. However, the saturated salt method has very strict requ...

Claims

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Application Information

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IPC IPC(8): G01N29/024
Inventor 沈国清安连锁刘伟龙张世平高宪波
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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