CN219532309U

CN219532309U - Instrument capable of accurately measuring two-way temperature

Info

Publication number: CN219532309U
Application number: CN202123013029.8U
Authority: CN
Inventors: 王知非
Original assignee: Jiangsu Suweier Science Technology Co ltd
Current assignee: Jiangsu Suweier Science Technology Co ltd
Priority date: 2021-12-02
Filing date: 2021-12-02
Publication date: 2023-08-15
Anticipated expiration: 2031-12-02

Abstract

The utility model discloses an instrument capable of accurately measuring two-way temperature, which comprises an analog-to-digital conversion chip, a Bluetooth module and a power supply module, wherein the thermometer probe circuit is connected and integrated in a shell through a corresponding plug structure; the analog-digital conversion chip is connected with pins 3 and 4 of the sensor probe to collect the voltage difference between the two pins, and the collected voltage difference is input into the analog-digital conversion chip to be used as input voltage Vin; the 1-pin power supply module of the sensor probe obtains a power supply voltage Vsense, and the 4-pin is grounded; the analog-to-digital conversion chip is connected with the power supply module to obtain a reference voltage Vref; the reference voltage Vref of the analog-to-digital conversion chip is the same as the power supply voltage Vsense of the sensor probe; the Bluetooth module is connected with the analog-to-digital conversion chip. The utility model is suitable for experiments requiring simultaneous comparison of experimental temperatures in middle school physicochemical experiments, and can realize double-path temperature display with high accuracy and large measuring range.

Description

Instrument capable of accurately measuring two-way temperature

Technical Field

The utility model relates to the technical field of science experiments, in particular to an instrument capable of accurately measuring two-way temperature.

Background

The thermometer is a common instrument in a science experiment, a common glass tube thermometer in a traditional experiment is used, and temperature measurement is realized by utilizing the principle of thermal expansion and cold contraction of liquid. Kerosene thermometers and mercury thermometers are common. The traditional thermometer has simple structure and low price, but the upper and lower measurement limits and the measurement precision are limited by the quality of glass and the property of a temperature measuring medium, and the thermometer cannot be remotely transmitted and is fragile. Meanwhile, although the mercury thermometer is more accurate, the reading is more difficult and dangerous; kerosene thermometer readings are easy and safe but relatively less accurate.

In recent years, along with the continuous emphasis of national classroom education, continuous exploration of classroom education modes, especially innovation and innovation in teaching aspects such as physics and chemistry, needs students to have enough participation and practical capability in classroom education, and traditional physical experiment equipment is updated. Thermometers are also in widespread use, based on temperature sensors. In practical teaching, two different temperatures need to be measured simultaneously, two temperature sensors are usually adopted to measure simultaneously, and the measured results are transmitted to the mobile terminal through a wireless Bluetooth method, so that the problems of inconvenient or inaccurate pairing of data transmission and the like can be caused. There is therefore a need for an instrument that can measure two problems simultaneously.

Disclosure of Invention

1. The technical problems to be solved are as follows:

aiming at the technical problems, the utility model provides an instrument capable of accurately measuring two-way temperature, the novel thermometer is high in sensitivity and accuracy, large in measuring range, and convenient for data transmission by supporting Bluetooth and USB communication, and can be used for measuring two-way, displaying real-time data on a flat plate and facilitating observation. In some experiments with higher requirements on temperature precision or the need of simultaneous measurement and comparison, for example, in the process of researching the temperature difference change of an upper layer and a lower layer or in the heat conduction experiment of exploring a metal tube, the two-way temperature measurement brings great convenience to the experiment.

2. The technical scheme is as follows:

an instrument capable of accurately measuring two-way temperature, which is characterized in that: comprises two paths of thermometer probe circuits and a host shell; the thermometer probe circuit is connected to a circuit inside the host shell through a corresponding plug structure; the host shell is internally integrated with an analog-to-digital conversion chip, a Bluetooth module and a power supply module; the temperature sensor of the thermometer probe line is a 4-wire PT1000 sensor probe; the analog-digital conversion chip is of the model AD7124; the analog-digital conversion chip is connected with pins 3 and 4 of the sensor probe to collect the voltage difference between the two pins, and the collected voltage difference is input into the analog-digital conversion chip to be used as input voltage Vin; the 1-pin power supply module of the sensor probe obtains a power supply voltage Vsense, and the 4-pin is grounded; the analog-to-digital conversion chip is connected with the power supply module to obtain a reference voltage Vref; the reference voltage Vref of the analog-to-digital conversion chip is the same as the power supply voltage Vsense of the sensor probe; the Bluetooth module is connected with the analog-to-digital conversion chip.

Further, the Bluetooth module is a module of YHD-BT423 combining an MCU and the Bluetooth module.

Further, the power module comprises a rechargeable battery, and the rechargeable battery is charged through a USB port interface arranged on the host shell; the power supply module outputs two paths of voltages of 3V; one path is the power supply of the Bluetooth module and the serial interface power supply voltage of the analog-to-digital conversion chip; the other path provides a power supply voltage Vsense for the sensor probe, and simultaneously provides an analog power supply voltage and a reference voltage Vref for the analog-to-digital conversion chip.

Further, the collected data is transmitted to the mobile terminal through the Bluetooth module; the mobile terminal comprises a computer and a tablet.

3. The beneficial effects are that:

(1) The instrument capable of accurately measuring the two-way temperature is suitable for experiments requiring simultaneous comparison of experimental temperatures in middle school physicochemical experiments, and can realize two-way temperature display with high accuracy and large range.

(2) The instrument capable of accurately measuring the two-way temperature provided by the utility model has the advantages that the special temperature sensor probe is utilized, and the data acquisition is safe and reliable; the mobile terminal is utilized to display the temperature in real time, so that data can be recorded at any time and a temperature change curve can be observed; the experimental operation is simple and convenient, and the plug and play is realized.

Drawings

FIG. 1 is an external view of the present utility model;

FIG. 2 is a circuit diagram of a two-way thermometer probe and an analog-to-digital conversion chip in the present utility model;

FIG. 3 is a circuit diagram of the connection part of the analog-to-digital conversion chip and Bluetooth according to the present utility model

Fig. 4 is a circuit diagram of a bluetooth portion in the present utility model;

fig. 5 is an acquired image of an embodiment.

Detailed Description

The present utility model will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, an apparatus capable of accurately measuring two-way temperature is characterized in that: comprises two paths of thermometer probe circuits and a host shell; the thermometer probe circuit is connected to a circuit inside the host shell through a corresponding plug structure; the host shell is internally integrated with an analog-to-digital conversion chip, a Bluetooth module and a power supply module; the temperature sensor of the thermometer probe line is a 4-wire PT1000 sensor probe; the analog-digital conversion chip is of the model AD7124; the analog-digital conversion chip is connected with pins 3 and 4 of the sensor probe to collect the voltage difference between the two pins, and the collected voltage difference is input into the analog-digital conversion chip to be used as input voltage Vin; the 1-pin power supply module of the sensor probe obtains a power supply voltage Vsense, and the 4-pin is grounded; the analog-to-digital conversion chip is connected with the power supply module to obtain a reference voltage Vref; the reference voltage Vref of the analog-to-digital conversion chip is the same as the power supply voltage Vsense of the sensor probe; the Bluetooth module is connected with the analog-to-digital conversion chip.

In the device, when the temperature of the temperature probe is changed, the resistance value of the internal resistor of the temperature probe PT1000 is changed relatively, the voltage Vin at two ends of the temperature probe PT1000 is also changed, and the analog-digital conversion chip AD7124 collects the voltage Vin of the PT1000, namely the voltage between 3 pins and 4 pins of J3/J4. The ratio of Vin to the reference voltage Vref (U6-12 pins) of the analog-to-digital conversion chip AD7124 is proportional to the output DATA DATA, the AD7124 can output the DATA DATA to the Bluetooth module, the internal program of the Bluetooth module calculates the resistance value of PT1000 according to the DATA, the current temperature is obtained by looking up a table, and then the temperature DATA is displayed on a flat plate through Bluetooth connection. The two-way temperature probe collects data simultaneously, and the ADC outputs two-way data. The reference voltage Vref in the circuit is the same as the sensor power supply voltage Vsense, and the fluctuation of the temperature value caused by the fluctuation of the sensor PT1000 power supply voltage is eliminated.

Specific examples:

experiment name purpose: study of temperature difference variation between upper and lower layers in water heating/cooling process

The experimental process comprises the following steps:

and opening a new instrument capable of accurately measuring the two-way temperature and a switch on a flat plate, and indicating that the connection is successful when a Bluetooth indicator lamp (green light) of the thermometer is on.

The temperature probe is respectively put into the upper layer and the lower layer of water, the temperature data change can be observed on the flat plate, the resolution can be set to be 0.01 ℃, and the accuracy is +/-0.1 ℃; a temperature change curve can also be generated, sampling time is set to be 1 hour, sampling intervals are set to be 5 seconds, and as shown in fig. 3, the temperature difference between the upper layer and the lower layer at different moments can be more intuitively observed.

While the utility model has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model, and it is intended that the scope of the utility model shall be defined by the appended claims.

Claims

1. An instrument capable of accurately measuring two-way temperature, which is characterized in that: comprises two paths of thermometer probe circuits and a host shell; the thermometer probe circuit is connected to a circuit inside the host shell through a corresponding plug structure; the host shell is internally integrated with an analog-to-digital conversion chip, a Bluetooth module and a power supply module; the temperature sensor of the thermometer probe line is a 4-wire PT1000 sensor probe; the analog-digital conversion chip is of the model AD7124; the analog-digital conversion chip is connected with pins 3 and 4 of the sensor probe to collect the voltage difference between the two pins, and the collected voltage difference is input into the analog-digital conversion chip to be used as input voltage Vin; the 1-pin power supply module of the sensor probe obtains a power supply voltage Vsense, and the 4-pin is grounded; the analog-to-digital conversion chip is connected with the power supply module to obtain a reference voltage Vref; the reference voltage Vref of the analog-to-digital conversion chip is the same as the power supply voltage Vsense of the sensor probe; the Bluetooth module is connected with the analog-to-digital conversion chip.

2. An instrument capable of accurately measuring two-way temperature according to claim 1, wherein: the Bluetooth module is a module of YHD-BT423 combining an MCU and the Bluetooth module.

3. An instrument capable of accurately measuring two-way temperature according to claim 1, wherein: the power module comprises a rechargeable battery, and the rechargeable battery is charged through a USB port interface arranged on the host shell; the power supply module outputs two paths of voltages of 3V; one path is the power supply of the Bluetooth module and the serial interface power supply voltage of the analog-to-digital conversion chip; the other path provides a power supply voltage Vsense for the sensor probe, and simultaneously provides an analog power supply voltage and a reference voltage Vref for the analog-to-digital conversion chip.

4. An instrument capable of accurately measuring two-way temperature according to claim 1, wherein: transmitting the acquired data to a mobile terminal through a Bluetooth module; the mobile terminal comprises a computer and a tablet.