Dual-channel high-low-frequency ultrasonic attenuation signal detection device

A technology for signal attenuation and detection device, which is applied in measurement devices, suspension and porous material analysis, particle size analysis, etc. Effect

Inactive Publication Date: 2010-12-15
DANDONG DONGFANG MEASUREMENT&CONTROL TECHCO
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  • Abstract
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Problems solved by technology

Similar foreign products use step attenuators to perform interpolation and query to obtain ultrasonic attenuation signals. The accuracy is poor (1-2dB), the measurement de

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  • Dual-channel high-low-frequency ultrasonic attenuation signal detection device
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Embodiment Construction

[0009] The structure and detection method of the present invention will be described in detail in conjunction with the accompanying drawings.

[0010] A dual-channel ultrasonic attenuation signal detection device, such as figure 1 As shown, the principle is: the CPU unit controls the transmitting circuit 9, and the transmitting circuit 9 is a prior art, that is, a high-frequency ultrasonic signal generator, the pulse is transmitted by the transmitting transducer, and then received by the receiving transducer, and the attenuation signal is sent to After the data is processed, it is sent to the CPU unit for judgment to determine whether the data meets the requirements for use. If it does not meet the requirements for use, the CPU unit will control the transmitting circuit again and repeat the same action. The specific working process is: the CPU unit time-sharingly controls the transmitting circuit 9 to generate a driving signal for driving the ultrasonic sensor. The driving sig...

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Abstract

The invention relates to a dual-channel ultrasonic attenuation signal detection device. Ultrasonic attenuation signals received by two receiving ultrasonic transducers of the device are converted into DC signals capable of being collected by an A/D (Analog-to-Digital) converter through a logical control circuit, a cascade amplifying circuit and an AC modulation circuit. The ultrasonic attenuation signal detection accuracy of the device is not less than 0.1 dB, the ultrasonic attenuation signal detection capacity is in a dynamic range of 94 dB, and thus, the detection accuracy on pulp density and particle size for an ultrasonic online particle size analyzer is increased.

Description

technical field [0001] The invention relates to an ultrasonic detection instrument, in particular to a detection device for a dual-channel ultrasonic attenuation signal used for online particle size detection. Background technique [0002] During the development of the ultrasonic online particle size analyzer, it was found that when the ultrasonic wave propagates in the pulp, the ultrasonic waves with different frequencies have different correlations between the concentration of the pulp and the particle size change; Concentration changes are more sensitive and relatively insensitive to changes in pulp particle size; at the same time, a relatively high-frequency ultrasonic signal is only sensitive to changes in pulp particle size and relatively insensitive to changes in pulp concentration; thus realizing the principle of ultrasonic attenuation On-line particle size detection must use two sets of ultrasonic signals with different frequencies at the same time, so to realize on...

Claims

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Application Information

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IPC IPC(8): G01N15/02G01N15/06
Inventor 崔祜林李明东杨健白纯熊向前李少华白羽王永全黄永刚赵岩
Owner DANDONG DONGFANG MEASUREMENT&CONTROL TECHCO
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