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Transmitter modulation device for real-time transmission of noise measurement data

A technology of real-time transmission and noise measurement, applied in transmission systems, electrical components, etc., can solve the problems of attenuation and signal transmission susceptible to electromagnetic noise interference, and achieve the goal of avoiding interference, reducing susceptibility to electromagnetic noise interference, and improving anti-interference. Effect

Active Publication Date: 2020-12-18
山东省安正安全咨询服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a transmitter modulation device for real-time transmission of noise measurement data, which has the characteristics of ingenious design and humanized design, and effectively solves the problem of low-frequency transmission of the transmitter, signal Susceptibility to electromagnetic noise interference and attenuation in the transmission process

Method used

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  • Transmitter modulation device for real-time transmission of noise measurement data
  • Transmitter modulation device for real-time transmission of noise measurement data
  • Transmitter modulation device for real-time transmission of noise measurement data

Examples

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Effect test

Embodiment 1

[0014] Embodiment 1, the transmitter modulation device for real-time transmission of noise measurement data, the frequency voltage conversion circuit receives the 200-1000Hz frequency signal output by the noise sensor model GSD130, and the inductance L1, the inductance L2, the variable capacitor CP1, the variable The resonant circuit composed of capacitor CP2 resonates to generate a resonant frequency to obtain a single frequency signal corresponding to the measurement noise for transmission, and then the frequency voltage is formed by the frequency voltage conversion chip U1, resistor R2-resistor R7, capacitor C1-capacitor C3, and potentiometer RP1 The converter is converted into a 2V-6V voltage signal that is linear with a single frequency signal, and then enters the frequency modulation circuit to receive the frequency signal generated by the resonant circuit, and through the impedance matching circuit composed of capacitor C4, capacitor C5, inductor L3, and inductor L4. The...

Embodiment 2

[0015] Embodiment 2, on the basis of Embodiment 1, the frequency modulation circuit receives the frequency signal generated by the resonant circuit, and obtains 2V-6V without attenuation through the impedance matching circuit composed of capacitor C4, capacitor C5, inductor L3, and inductor L4 The voltage signal, the 2V-6V voltage signal enters the subtractor of the operational amplifier AR1 as the core and subtracts the reference voltage signal corresponding to the optimal transmission frequency 900MH to obtain the frequency deviation signal. When there is no frequency deviation or the frequency deviation is less than 0.7V, the transistor Q2 Not working, the relay K1 does not act, the normally closed contacts K1-1 and K1-2 of the relay K1 do not act, the frequency signal generated by the resonant circuit passes through the transistor Q1, the varactor diode DC1, the inductor L5, and the capacitor C7-capacitor C10 as the core The 450MHz oscillating frequency generated by the LC ...

Embodiment 3

[0016]Embodiment 3, on the basis of Embodiment 2, the frequency-voltage conversion circuit receives the noise sensor model GSD130 (high measurement sensitivity: A, accurate and reliable: level 2, fast response: F, RS485 communication interface) output 200 The -1000Hz frequency signal resonates with the resonant circuit composed of inductor L1, inductor L2, variable capacitor CP1, and variable capacitor CP2 to generate a resonant frequency, so as to obtain a single frequency signal corresponding to the measurement noise and transmit it to the subsequent circuit, and then through the frequency voltage Conversion chip U1 (can be LM331), resistor R2-resistor R7, capacitor C1-capacitor C3, and potentiometer RP1 form a frequency-voltage converter to convert a 2V-6V voltage signal linear with a single frequency signal, including inductor L1 and inductor L2 , The variable capacitor CP1, the upper end of the inductor L1, the left end of the inductor L2, and the upper end of the variable...

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Abstract

The invention discloses a transmitter modulation device for real-time transmission of noise measurement data. A frequency-voltage conversion circuit resonates with a 200-1000 Hz frequency signal outputted by a received noise sensor via a resonance circuit to obtain a frequency signal corresponding to the measurement noise, then the frequency signal is converted by a frequency-voltage converter into a 2V-6V voltage signal, a frequency modulation circuit receives the frequency signal generated by the resonant circuit and obtains the undamped 2V-6V voltage signal through an impedance matching circuit, the 2V-6V voltage signal is input to an adder to obtain a frequency deviation signal, modulation is performed through 450MHz oscillation frequency or the modulation is performed through adjustable oscillation frequency, the accuracy of frequency modulation is improved, the modulated signal is multiplied by a frequency multiplier by 2 times and is finally modulated to optimal transmission frequency 900 MHz of a coal mine for transmission to finally enter an amplification output circuit, and the frequency signal is is added to transmitter after amplitude amplification, amplitude limiting,voltage stabilization and filtering. The problem that during the low frequency band transmission of the transmitter, a signal transmission process is susceptible to electromagnetic noise interferenceand attenuation is solved.

Description

technical field [0001] The invention relates to the technical field of coal mine and noise measurement, in particular to a transmitter modulation device for real-time transmission of noise measurement data. Background technique [0002] Noise can hinder people's work, conversation, rest and sleep, damage people's hearing, and cause people's psychological, physiological and pathological reactions, especially in coal mines. The noise hazard is even worse. Employees exposed to this environment for a long time will cause noise-induced hearing loss. Therefore, it is necessary to measure and monitor the noise, and then take noise reduction protection measures. At present, noise sensors are mainly used to measure coal mine noise information, which is transmitted to the computer through communication cables or transmitters, and then transmitted to the monitoring center server by the computer in real time through the network. For remote monitoring, since it is inconvenient to lay com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04
CPCH04B1/04H04B1/0475H04B2001/0491
Inventor 方希景王艳娇冯艳花杨现林孙山生郭志军马会涛赵昆南其他发明人请求不公开姓名
Owner 山东省安正安全咨询服务有限公司
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