SU972389A1 - Method of checking content of substance suspended in water - Google Patents

Description

(54) METHOD FOR XRTLED CONTENT OF WEIGHED SUBSTANCES IN WATER

one

The invention relates to environmental protection, in particular to the technique of monitoring water pollution by suspended substances.

A known method of controlling suspended matter in water is that water is sampled in the control zone, the volume of the sample is determined and, after intensive evaporation, a precipitate is obtained by heating, according to the weight ratio of which to the controlled parameter; Shch.

The disadvantage of this method is low productivity due to the high duration of the operation of evaporation of moisture in the sample.

The closest to the proposed technical essence and the achieved effect is a method of controlling the content of suspended substances in water by measuring the change in amplitude

a pulse of ultrasonic oscillations of a relative reference signal after it travels a fixed distance in a controlled environment 2.

However, the known method has a significant error due to the influence of gas bubbles contained in the water on the amplitude of the received signal.

The purpose of the invention is to improve the accuracy of 10 control of suspended matter in water.

This goal is achieved by measuring the change in the passage time 5 of a pulse of ultrasonic oscillations in controlled water relative to the time it passes in the filtered ode, the coefficients of change in the amplitude of the pulse after passing

Claims (1)

20 of these waters and the time of its passage and the specified parameters determine the content of suspended substances in controlled water. The content of suspended substances in the controlled water is determined by the ratio.) () Where K and K "are the amplitude coefficients of variation of the controlled and filtered water pulse; Kj and K are the coefficients of the change in the time of the pulse propagation of these waters; l and / Ug is the change in the amplitude of the impulse of ultrasonic oscillations relative to the reference signal; l T / Td is the change in the time of passage of a pulse of ultrasonic oscillations in controlled water relative to the time of its passage in filtered water. The drawing shows a block diagram of a device implementing the method. The device circuit comprises a pulse generator 1, an ultrasonic emitter 2 and a receiver 3, an amplifier 4, a unit 5 for measuring amplitude changes, a unit 6 for measuring the propagation time of the ultrasonic pulse, and a bracket 7 for fixing the radiator and receiver at a predetermined distance. The method is carried out as follows. Through the emitter 2, the excitation generated by the electric pulse of the generator 1 is sent an ultrasonic pulse to the controlled fluid 8. The last emitter 2 and the receiver 3 are monitored with the aid of the gauge 7. At the time T from the moment of radiation, the ultrasonic 1 reaches the receiver 3, which converts him into an electrical signal. This signal is fed through an amplifier 4 to block 5, and the generator pulse 1 from its second output is also fed to the second input. In this block, a reference voltage is formed from the generator pulse (J which is compared with the peak amplitude and amplified signal of the receiver, to produce the difference dU U - UQ. You have a signal 9 of block 5 that has amplitude E,.), (1) where K - constant coefficient; the coefficient of dependence of amplitude, signal amplitude on the volume concentration q, suspended substances in water; UQ is the signal amplitude for deaerated filtered water; K - coefficient of the dependence of the signal amplitude on the volume concentration of gas bubbles. The time T of the propagation of an ultrasonic pulse in water is o () -) de tp - the propagation time of the ultrasonic pulse in filtered deaerated water; K 7) - coefficient of dependence of the time of ultrasound propagation in water on the concentrate from suspended substances; Ki is the coefficient of the dependence of the propagation time of ultrasound in water on the concentration c, gas bubbles in water. From the second output of amplifier 4, the amplified received signal is fed to the input of block 6, to another input of which a delayed pulse is supplied from the third output of generator 1. The delay time is set to tp. In block 6, a DC signal 10 is generated, having an amplitude of E " (K ,, q, + К4Я, 2). ui t Before controlling the concentration of q, suspended substances, which determine the degree of water purity, a preliminary determination is made of the K-factors, - on a sample with q, and one of the values cj, equal to. Sample at s - O and one of the values of c equal to q2. This determination is carried out using the described scheme. The measured values of the stresses E (), E (c), E, j (q,) and E ((p2) are used according to relations (1) and (3) to determine the coefficients: Content, suspended matter in controlled water determined by the ratio of i4 4- / o- - / oKNVV3) By eliminating the influence of cj,., gas, bubbles on the expellation process, the accuracy of controlling the content of suspended substances in water, in particular, the purity of flowing and wastewater, increases . Claim 1. Method of controlling suspended matter content in water by measuring the amplitude of the pulse amplitude of ultrasonic oscillations of the relative reference signal after passing a fixed distance in a controlled environment, which is different in that, in order to increase the accuracy of control, the change in the pulse transit time is measured ultrasonic vibrations in controlled water with respect to the time of its passage in filtered water, determine the coefficients of change of the amplitude of the pulse after the passage of these in d and time audio its passage and said para-meters were determined content of suspended substances in a controlled water. 9 6. The method according to claim 1, characterized in that the content of matter suspended in the controlled water is determined by the ratio. K and KQ are the coefficients of the change in the amplitude of the pulse for & controllable and filtered water; - coefficients of change КЕИК4 of the time of passage of the impulse of these waters; LO / and -the change in the amplitude of the pulse of the ultrasonic oscillations relative to the reference signal; yi / TX P is the change in the pulse transit time of the ult. razvukovyh fluctuations in controlled water relative to the time of its passage through the filtered water. Sources of information that are considered in the examination. Kivilis S. S, Plotnomery, M., Rgi, 1980, p. 81-82. . USSR author's certificate 75499, cl. Q 01 N 29/02, 1970.