Non-contact measurement device for alcohol concentration

Abstract

The utility model relates to a non-contact measuring device which is simple and convenient to operate, convenient to carry and suitable for directly detecting alcohol concentration on site, and comprises a mounting rack, a cuvette, an infrared transmitting tube, an infrared receiving tube, a data processing module and a display screen, the data processing module comprises a single chip microcomputer U1, a signal filter circuit, an ADC sampling circuit, a power supply circuit and a photosensitive diode; the photosensitive diode is mounted on the cuvette mounting rack and is connected with the signal filter circuit; the alcohol concentration of the sample can be directly measured by collecting the intensity of the infrared light projected by the alcohol sample, the use is convenient, and the accuracy is higher; through the signal filter circuit, while the quality of weak current signals collected by the photodiode is improved, interference and noise are eliminated, and a rear-end processor is protected; the device is simple and stable in structure and convenient to carry, the whole device is protected through the shell 4 and is not prone to shaking, and errors can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to alcohol concentration measurement technical field, especially in kind of alcohol concentration non -contact measurement device. BACKGROUND

[0002] Alcohol is a kind of chemical substance in people's life, is often used in the field such as beverage, solvent and disinfectant. The alcohol concentration required in different fields is also different, therefore, the measurement of alcohol concentration becomes an important problem, in medicine, the detection of human blood alcohol concentration is usually realized by blood test, this method is scientific and accurate, but its detection period is longer, and the efficiency is lower, another method is to use breath alcohol tester, but the detection precision of this method is insufficient, and it is easily disturbed by background noise, in addition, there are also hand-held refractometer using light refraction principle and liquid density hydrometer based on buoyancy principle, but it is easily affected by impurities, thereby leading to degree error, influence detection precision.

[0003] In order to realize fast, efficient, non-contact, non-pollution and accurate and stable alcohol concentration detection, so a kind of alcohol concentration non-contact measurement device is needed to solve this problem. UTILITY MODEL CONTENT

[0004] In view of the above situation, in order to overcome the defects of prior art, the purpose of the utility model is to provide a kind of non-contact measurement device which is simple and convenient to operate, convenient to carry, suitable for on-site direct detection of alcohol concentration, effectively solve the above problems.

[0005] Its solution technical scheme is, the utility model discloses mounting frame, cuvette, infrared emitter tube, infrared receiving tube, data processing module and display screen, infrared emitter tube and infrared receiving tube are correspondingly installed on the mounting frame, data processing module includes single-chip microcomputer U1, signal filter circuit, ADC sampling circuit, power supply circuit and photosensitive diode, photosensitive diode is installed on the cuvette mounting frame and is connected with signal filter circuit.

[0006] Further, the filter circuit includes operational amplifier U2, the same phase input end of operational amplifier U2 is connected with photosensitive diode, the output end of operational amplifier U2 is connected with resistance R1 in series, the other end of resistance R1 is grounded through capacitor C1, and the end connected with capacitor C1 of resistance R1 is signal output end, the reverse input end of operational amplifier U2 is connected with the output end of operational amplifier U2, photosensitive diode and resistance R1 between still be equipped with capacitor C10 parallelly connected with operational amplifier U2.

[0007] Further, the ADC sampling circuit comprises an analog-to-digital converter U5 and resistors RN1, the 7th pin of the analog-to-digital converter U5 is connected with one end of the resistor R1 and the capacitor C1, the 1st pin, the 2nd pin, the 9th pin and the 10th pin of the analog-to-digital converter U5 are respectively connected with four resistors in the resistors RN1.

[0008] Further, the power supply circuit comprises a first voltage stabilizer U4 and a second voltage stabilizer U7, the 3rd pin of the first voltage stabilizer U4 is connected with 5V voltage, the 4th pin of the first voltage stabilizer U4 outputs 1.2V voltage, the 3rd pin of the second voltage stabilizer U7 is connected with 5V voltage, the 4th pin of the second voltage stabilizer U7 outputs 3.3V voltage.

[0009] Further, the housing is further provided with a placing opening, the mounting frame is mounted at the lower side of the placing opening and the placing area on the mounting frame corresponds to the position of the placing opening, the data processing module and the display screen are both mounted in the housing, and the housing is further provided with an observation opening.

[0010] The beneficial effects of the present application are as follows:

[0011] 1. The intensity of the infrared light projected by the collected alcohol sample can directly measure the alcohol concentration of the sample, which is convenient to use and has high accuracy;

[0012] 2. The signal filtering circuit is used to improve the quality of the weak current signal collected by the photodiode, eliminate interference and noise, and protect the back-end processor;

[0013] 3. The structure is simple and stable, convenient to carry, and the whole is not easy to shake through the protection of the housing 4, so that the error can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present application.

[0015] Figure 2 It is a circuit connection diagram of the single-chip microcomputer U1 of the present application.

[0016] Figure 3 It is a circuit connection diagram of the signal filtering circuit of the present application.

[0017] Figure 4 It is a circuit connection diagram of the ADC sampling circuit of the present application.

[0018] Figure 5 It is a circuit connection diagram of the power supply circuit of the present application. DETAILED DESCRIPTION

[0019] The specific implementation manner of the present application will be further described in detail in combination with the drawings.

[0020] Embodiment:

[0021] As shown by Figures 1 to 5 The utility model discloses a rack 1, cuvette 2, infrared transmitting tube, infrared receiving tube, data processing module and display screen 3, infrared transmitting tube and infrared receiving tube are installed on the rack 1 correspondingly, and data processing module includes singlechip U1, signal filter circuit, ADC sampling circuit, power supply circuit and photosensitive diode, and the photosensitive diode is installed on the rack 1 of cuvette 2 and is connected with signal filter circuit, signal filter circuit transmits to ADC sampling circuit after the signal of photosensitive diode is filtered and amplified, and ADC sampling circuit transmits to display screen 3 after analog signal is converted into digital signal, and the alcohol concentration is shown on display screen 3.

[0022] Need to explain, in order to improve the stability of data processing module, by Figure 3 As shown, the filter circuit includes operational amplifier U2, and the noninverting input terminal of operational amplifier U2 is connected with the photosensitive diode, and the output terminal of operational amplifier U2 is connected with resistance R1 in series, and the other end of resistance R1 is connected with capacitor C1 to ground, and the one end of resistance R1 and capacitor C1 is connected with signal output terminal, and the inverting input terminal of operational amplifier U2 is connected with the output terminal of operational amplifier U2, and capacitor C10 connected with operational amplifier U2 is further arranged between the photosensitive diode and resistance R1, and the input signal of photosensitive diode is pre-filtered, and the interference and noise signal in the specified frequency range are removed through the filter, and the signal is amplified, and the signal-to-noise ratio of signal is improved.

[0023] In addition, since analog signal needs to be converted into digital signal, by Figure 4 As shown, the ADC sampling circuit includes analog-digital converter U5 and resistance RN1, and the 7th pin of analog-digital converter U5 is connected with the one end of resistance R1 and capacitor C1, and the 1st pin, the 2nd pin, the 9th pin and the 10th pin of analog-digital converter U5 are connected with four resistances in resistance RN1 respectively, and the signal can be transmitted through four channels, and the analog of high resolution can be applied.

[0024] As shown by Figure 5 The power supply circuit includes first voltage stabilizer U4 and second voltage stabilizer U7, the third pin of first voltage stabilizer U4 is connected with 5V voltage, the 4th pin of first voltage stabilizer U4 outputs 1.2V voltage, the third pin of second voltage stabilizer U7 is connected with 5V voltage, and the 4th pin of second voltage stabilizer U7 outputs 3.3V voltage.

[0025] As shown by Figure 1The shell 4 is further provided with an observation opening for observing the content on the display screen 3.

[0026] The single-chip microcomputer U1 used in the application can be an STM32F103ZET6 single-chip microcomputer, the operational amplifier U2 used can be an LM321MFX, the analog-to-digital converter U5 used can be an ADS1115 module, and the first voltage stabilizer U4 and the second voltage stabilizer U7 can be ams1117-3.3 and ams1117-1.2, respectively.

[0027] Before use, three alcohol gauges with scales of 0-40 degrees, 40-70 degrees and 70-100 degrees and a thermometer are taken to measure the data of the sample alcohol, the standard alcohol concentration is measured according to a commonly used concentration-temperature conversion method, then the alcohol sample is obtained by using the cuvette 2, the cuvette 2 containing the alcohol sample is placed on the mounting rack 1 through the placement opening, the infrared emitter tube emits red light into the cuvette 2 and reaches the infrared receiving tube, the photodiode converts the light signal into an electric signal according to the intensity of the infrared light, and then the electric signal is converted into a voltage value through the ADC sampling circuit, and the corresponding relationship between the voltage measured at different concentrations and the alcohol concentration curve is fitted, so that the alcohol concentration can be obtained by the corresponding relationship between the voltage of the measured alcohol sample to be detected and the alcohol concentration when the application is used.

[0028] The above specific embodiments are specific embodiments of the application, used to illustrate the concept of the application, and are all explanatory and exemplary, and should not be interpreted as limiting the embodiments and the scope of the application. In addition to the embodiments described herein, those skilled in the art can also use other technical solutions that are obvious based on the content disclosed in the claims and the specification of the application, and these technical solutions, including any obvious replacement and modification of the embodiments described herein, are within the protection scope of the application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A device for non-contact measurement of alcohol concentration, characterized in that, The application relates to a colorimetric analysis device, which comprises a mounting frame (1), a colorimetric cup (2), an infrared emitting tube, an infrared receiving tube, a data processing module and a display screen (3), the infrared emitting tube and the infrared receiving tube are correspondingly mounted on the mounting frame (1), the data processing module comprises a single-chip microcomputer U1, a signal filtering circuit, an ADC sampling circuit, a power supply circuit and a photosensitive diode, the photosensitive diode is mounted on the mounting frame (1) of the colorimetric cup (2) and is connected with the signal filtering circuit.

2. A device for non-contact measurement of alcohol concentration according to claim 1, characterized in that, The filtering circuit comprises an operational amplifier U2, the non-inverting input end of the operational amplifier U2 is connected with the photosensitive diode, the output end of the operational amplifier U2 is connected with the resistor R1 in series, the other end of the resistor R1 is connected with the capacitor C1 in parallel, and the connection end of the resistor R1 and the capacitor C1 is a signal output end; the inverting input end of the operational amplifier U2 is connected with the output end of the operational amplifier U2, and the capacitor C10 connected with the operational amplifier U2 in parallel is arranged between the photosensitive diode and the resistor R1.

3. A device for non-contact measurement of alcohol concentration according to claim 2, characterized in that, The ADC sampling circuit comprises an analog-to-digital converter U5 and a resistor RN1, the 7th pin of the analog-to-digital converter U5 is connected with the connection end of the resistor R1 and the capacitor C1, the 1st pin, the 2nd pin, the 9th pin and the 10th pin of the analog-to-digital converter U5 are respectively connected with four resistors in the resistor RN1.

4. A device for non-contact measurement of alcohol concentration according to claim 3, characterized in that, The power supply circuit comprises a first voltage stabilizer U4 and a second voltage stabilizer U7, the 3rd pin of the first voltage stabilizer U4 is connected with a 5V voltage, the 4th pin of the first voltage stabilizer U4 outputs a 1.2V voltage, the 3rd pin of the second voltage stabilizer U7 is connected with a 5V voltage, and the 4th pin of the second voltage stabilizer U7 outputs a 3.3V voltage.

5. A device for non-contact measurement of alcohol concentration according to any of claims 1-4, characterized in that, The application further comprises a shell (4), the shell (4) is provided with a placing opening, the mounting frame (1) is mounted on the lower side of the placing opening and the placing area on the mounting frame (1) corresponds to the position of the placing opening, the data processing module and the display screen (3) are both mounted in the shell (4), and the shell (4) is further provided with an observation opening.

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