JPS62176726U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a system block diagram showing the relationship of the entire device of the present invention, Fig. 2 A and B are block diagrams showing two embodiments of the ultrasonic temperature measuring section, and Fig. 3 shows the ultrasonic receiving sensor in a facing relationship. FIG. 4 is a block diagram of a constant-temperature type hot wire flow velocity measurement section, and FIG. 5 is a block diagram illustrating the operation of the arithmetic unit. (Explanation of symbols), 1... Ultrasonic temperature measurement section,
...constant temperature type hot wire flow velocity measurement section, ...calculation device,
1, 2... are ultrasonic transmitting/receiving sensors, 3... ultrasonic pulse transmitting circuit, 4... ultrasonic pulse receiving circuit,
5... Ultrasonic pulse propagation counting means, 6... Hot wire for measuring flow velocity, 7... Bridge circuit, 8... Control circuit, 9... Current-voltage converter.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Consists of an ultrasonic temperature measurement section, a constant temperature type hot wire current velocity measurement section, and an arithmetic device, and the ultrasonic temperature measurement section includes ultrasonic transmission/reception sensors 1 and 2, and an ultrasonic pulse transmission circuit 3. , an ultrasonic pulse receiving circuit 4, and an ultrasonic pulse propagation time counting means 5, the constant temperature type hot wire flow velocity measuring section includes a hot wire 6 for current meter velocity measurement, a bridge circuit 7, and a control circuit for keeping the hot wire temperature constant. 8 and a current-voltage converter 9, the arithmetic device takes in the temperature of the fluid output from the measuring section and the output voltage of the hot wire output from the measuring section, respectively, and calculates the flow velocity at that temperature. A hot wire flow rate measuring device. 2 Ultrasonic transmitting/receiving sensors 1 and 2 are spaced apart on one side wall of the fluid pipe 10, and the ultrasonic pulse emitted from the transmitting sensor 1 crosses the fluid f and is reflected from the other pipe wall and reaches the receiving sensor 2. 2. The apparatus according to claim 1, wherein the ultrasonic pulse is transmitted and received, and the time limit between emission and reception is the propagation time of the ultrasonic pulse. 3 Ultrasonic transmitting/receiving sensors 1 and 2 are attached to mutually opposing pipe walls of the fluid conduit 10, and ultrasonic pulses emitted from the transmitting sensor 1 cross the fluid f at approximately right angles and are received by the receiving sensor 2. , the device according to claim 1, wherein the time limit between emission and reception is the propagation time of the ultrasonic pulse. 4. The ultrasonic pulse propagation time counting means 5 includes a clock oscillator 31 and a counter 33, and the ultrasonic pulse emitted from the ultrasonic transmitting circuit 3 reaches the ultrasonic receiving circuit 4 within the time limit.
The propagation time of the ultrasonic pulse is determined by opening the gate 32 of the gate 32 and determining the number of clock pulses input into the gate 32 by the clock oscillator 31 during this period. Or the device described in paragraph 3. 5. A shaping circuit 34 in which the ultrasonic pulse propagation time counting means 5 is connected in series between the ultrasonic pulse transmitting circuit 3 and the ultrasonic receiving circuit 4, and the receiving circuit 4.
The second utility model registration claim includes a pulse frequency counter 35 installed in parallel with the receiving circuit 4, and the pulse repetition frequency from the receiving circuit 4 is counted by the counter 35 to determine the propagation time of the ultrasonic pulse. The device according to item 3 or item 3. 6. The device according to claim 1, wherein the ultrasonic transmitting/receiving sensors 1 and 2 perform transmission and reception with one sensor.