A quartz optical cell circuit for calibrating an automatic polarimeter

Abstract

The present application relates to automatic polarimeter technical field, specifically refers to a kind of quartz optical tube circuit for calibrating automatic polarimeter, including: including sequentially connected wireless power receiving circuit, voltage reference circuit, bluetooth system controller, measurement system and temperature sensor, while wireless power receiving circuit is connected with bluetooth system controller.The present application overcomes the problem of low temperature measurement accuracy caused by semi-closed sample chamber under the structure of temperature-controlled quartz tube with wired sensor probe, designs low-power Bluetooth for two-way communication, and uses wireless power supply technology to make the temperature-controlled quartz tube completely into the fully-closed sample chamber structure, which greatly reduces the influence of flowing air on the optical rotation of quartz sheet, and improves the stability of temperature control temperature by an order of magnitude, thereby greatly improving the calibration accuracy of quartz optical tube, and helping the production and manufacture of high-precision polarimeter.

Description

Technical Field

[0001] This invention relates to the field of automatic polarimeter technology, specifically to a quartz polarimeter circuit for calibrating an automatic polarimeter. Background Technology

[0002] Quartz polarimeters are made from high-purity quartz crystals and are characterized by stable performance, small size, and portability. They are recommended by the International Commission on Methods for Sugar Analysis (ICUMSA) as a standard instrument for comparison and calibration, primarily used to calibrate the measurement accuracy of polarimeters and polarimetric saccharimeters. Quartz polarimeters have a specific temperature coefficient at certain wavelengths, and temperature control is crucial in the calibration of ultra-high precision polarimeters.

[0003] Both domestic and international manufacturers of high-precision automatic polarimeters design quartz polarimeter tubes that are compatible with their own sample testing devices. Traditional quartz polarimeter tubes, during calibration, are significantly affected by hand temperature, which is uncontrollable depending on the duration of holding the instrument. This limits their application to polarimeters with a precision of 0.1° and calibration operations within ±30° of rotation angle. Temperature-controlled quartz polarimeter tubes can largely avoid the influence of hand temperature by controlling the temperature of the tube structure; however, residual heat and temperature delay still exist in the quartz plate area exposed to air.

[0004] Therefore, in the calibration of ultra-high precision polarimeters, a fully enclosed sample chamber structure is generally required to enable automatic calibration of the quartz tube and the main unit in a non-contact manner. Using optical modulation data and wireless power supply technology allows for simple and reliable transmission of temperature measurement data for instrument calibration. When the quartz polarimeter is calibrated at a metrology institution, an independent device from the manufacturer is also required for initialization and writing. Summary of the Invention

[0005] This invention proposes a quartz cyclotron circuit for calibrating an automatic cyclotron, in order to solve the above-mentioned problems.

[0006] The purpose of this invention is to overcome the deficiencies and shortcomings of the existing technology and to propose a quartz cyclotron circuit for calibrating an automatic polarimeter.

[0007] A quartz polarimeter circuit for calibrating an automatic polarimeter includes a wireless power receiving circuit, a voltage reference circuit, a Bluetooth system controller, a measurement system, and a temperature sensor connected in sequence. At the same time, the wireless power receiving circuit is connected to the Bluetooth system controller.

[0008] Preferably, the wireless power receiving circuit is composed of L1, D1, D2, C2, C3, R5, and Q1; The L1 receives energy from the transmitter inside the instrument; One end of L1 is connected to one end of C2, one end of C3, and the anode of D2 and grounded; The other end of L1 and the other end of C3 are connected to the anode of D1, the cathode of D1 is connected to one end of R5 and the collector of Q1, and the other end of R5 is connected to the cathode of D2 and the base of Q1. The emitter of Q1 is connected to both the voltage reference circuit and the Bluetooth system controller.

[0009] Preferably, the voltage reference circuit is a precision voltage reference REF3030.

[0010] Preferably, the Bluetooth system controller includes a Bluetooth MCU with CC2340R5 as its core.

[0011] Preferably, the wireless power receiving circuit and the Bluetooth system controller include R3, R4 and C5. One end of R4 is connected to the output terminal of the wireless power receiving circuit, and the other end of R4 is connected to one end of R3 and the differential input interface of the Bluetooth system controller. The other end of R3 and one end of C5 are grounded, and the other end of C5 is connected to the analog input terminal of the Bluetooth system controller.

[0012] Preferably, the Bluetooth system controller and the measurement system are connected via an SPI interface.

[0013] Preferably, the measurement system is an LTC2410 integrated circuit.

[0014] Preferably, the temperature sensor consists of R1 and R2 connected in series, where R1 is a precision resistor and R2 is a thermistor. The temperature sensor generates a differential signal at the input terminal of the integrated circuit LTC2410.

[0015] Preferably, R2 is a Pt1000 thermal resistor.

[0016] Preferably, it includes C4, one end of which is connected to the output terminal of the wireless power receiving circuit and the input terminal of the voltage reference circuit, and the other end is grounded.

[0017] This invention uses Bluetooth Low Energy for bidirectional data transmission, uses a controllable wireless power supply technology to obtain power and control power consumption, and uses a high-precision temperature measurement circuit for temperature acquisition.

[0018] This invention discloses a wireless quartz rotator circuit suitable for temperature control, comprising: a wireless power receiving circuit consisting of L1, D1, D2, C2, C3, R5, and Q1. The L1 receiving coil receives energy from the transmitter inside the instrument. Through an LC oscillator, a forward current is extracted by the D1 Schottky diode and injected into the base and collector of the Q1 transistor. The alternating current provides a switching bias current at the base through the R5 resistor and the D2 Zener diode. Due to the presence of the circuit load, a voltage of 3~5V is formed at the emitter of the Q1 transistor.

[0019] U3 is a precision voltage reference REF3030. Utilizing its small package and low 1mV dropout voltage, it can provide a stable 3.0V reference voltage for control and measurement systems, delivering up to 25mA of current. The C4 bypass capacitor reduces input noise from the voltage source and transmits the input voltage signal to the control system via a voltage divider formed by R3 and R4.

[0020] The control system is a Bluetooth controller integrated circuit, which is a minimum system board composed of a CC2340R5 Bluetooth MCU as the core and surrounding capacitors, crystal oscillators, built-in antennas, debugging interfaces, etc. It communicates bidirectionally with the instrument through Bluetooth Low Energy (BLE5) to realize functions such as real-time temperature data transmission, quartz tube information reading, synchronous calibration data, and synchronous power control.

[0021] The temperature measurement system consists of an integrated circuit U1, a precision resistor R1, and a Pt1000 thermal resistor R2. The integrated circuit U1 is an LTC2410, a low-noise 24-bit differential ΔΣ analog-to-digital converter with a noise level of 0.16ppm RMS, which transmits the acquired quartz tube temperature data to the control system in real time via an SPI interface for feedback control by the instrument host.

[0022] This invention provides the following technical solution: Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention overcomes the problem of low temperature measurement accuracy caused by the semi-enclosed sample chamber in the temperature-controlled quartz tube structure with wired sensor probes. It designs a two-way communication system using low-power Bluetooth and wireless power supply technology, which allows the temperature-controlled quartz tube to be completely placed in a fully enclosed sample chamber structure. This greatly reduces the influence of flowing air on the optical rotation of the quartz plate and can improve the overall temperature stability by an order of magnitude. As a result, the calibration accuracy of the quartz polarimeter is greatly improved, which is helpful for the production and manufacturing of high-precision polarimeters.

[0023] Thanks to the implementation of Bluetooth full-duplex communication, the temperature-controlled quartz tube can be automatically calibrated and easily written to during calibration by metrology institutions. Manufacturers do not need to use additional devices to calibrate the quartz tube before packaging, resulting in higher accuracy and greater stability of the calibrated temperature-controlled quartz tube. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a circuit block diagram of the quartz polarimeter used for calibrating an automatic polarimeter according to the present invention; Figure 2 This is a circuit diagram of an embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Example: A wireless quartz rotator circuit suitable for temperature control according to the present invention (as shown in the attached diagram). Figure 1 As shown), it includes a wireless receiver 1, which uses the electrical energy of the receiving coil to generate a 3~5V DC power supply. This power is then controlled at 3.0V via a voltage reference 2, providing power to the Bluetooth system controller 3. It also provides power to the measurement system 4 as a power source and a bridge voltage reference. A temperature sensor 5 is connected to the bridge circuit of the measurement system 4. The measurement system 4 connects via an SPI interface (…). Figure 2 The SCK+SDO+ / CS shown transmits temperature measurement data to the Bluetooth system controller 3. The output of the wireless receiver 1 is connected to the analog input of the Bluetooth system controller 3 after the signal is attenuated by a resistor. Figure 2 (DIO24 shown).

[0028] Embodiments of the present invention (as shown in the appendix) Figure 2 As shown, the wireless receiver 1 consists of L1, D1, D2, C2, C3, R5, and Q1. The L1 receiving coil receives energy from the transmitter inside the instrument. Through the LC oscillator, the forward current is extracted by the D1 Schottky diode and injected into the base and collector of the Q1 transistor. The alternating current provides a switching bias current at the base through the R5 resistor and the D2 Zener diode. Due to the presence of the circuit load, a voltage of 3~5V is formed at the emitter of the Q1 transistor.

[0029] The voltage reference 2 is a precision voltage reference REF3030. Utilizing its small package and low 1mV dropout, it can provide a stable 3.0V reference voltage for the control and measurement systems, offering up to 25mA of current. The bypass capacitor C4 is used to reduce input noise from the voltage source and transmits the input voltage signal to the control system via a voltage divider formed by R3 and R4.

[0030] The Bluetooth system controller 3 is a Bluetooth controller integrated circuit, which is a minimum system board composed of a CC2340R5 Bluetooth MCU as the core and surrounding capacitors, crystal oscillators, built-in antennas, debugging interfaces, etc. It communicates bidirectionally with the instrument through Bluetooth Low Energy (BLE5) to realize functions such as real-time temperature data transmission, quartz tube information reading, synchronous calibration data, and synchronous power control.

[0031] The temperature measurement system 4 is composed of an integrated circuit LTC2410, which is a 0.16ppm RMS low-noise, 24-bit differential ΔΣ analog-to-digital converter that transmits the collected quartz tube temperature data to the control system in real time via the SPI interface for feedback control by the instrument host.

[0032] The temperature sensor 5 consists of a precision resistor R1 and a thermal resistor R2 (Pt1000), and forms a differential signal at the input terminal of the integrated circuit LTC2410.

[0033] After the Bluetooth system controller 3 is powered on, it will activate the Bluetooth BLE5 communication function. After system initialization, it will automatically enter the broadcast mode and broadcast data such as the calibration information, manufacturer information, and ID of the temperature-controlled quartz tube.

[0034] When the instrument's main system is connected to the temperature-controlled quartz tube, the quartz tube will enter master-slave mode. The main system will then operate to transmit temperature data in real time and control the Peltier temperature controller to precisely control the temperature of the quartz tube.

[0035] The input voltage signal is transmitted to the control system of the temperature-controlled quartz tube through the voltage divider R3 and R4, which can generate a voltage signal of 0.75~1.25V. After being modulated by the Bluetooth controller of the temperature-controlled quartz tube, the signal is fed back to the main unit of the instrument. The main unit will use this signal to stabilize the output voltage of the wireless receiver 1 and adjust the uniformity of the additional heat of the circuit system on the temperature-controlled quartz tube.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A quartz cyclotron circuit for calibrating an automatic polarimeter, characterized in that, It includes a wireless power receiving circuit, a voltage reference circuit, a Bluetooth system controller, a measurement system, and a temperature sensor connected in sequence. At the same time, the wireless power receiving circuit is connected to the Bluetooth system controller.

2. The quartz vortex tube circuit for calibrating an automatic vortex apparatus as described in claim 1, characterized in that, The wireless power receiving circuit consists of a receiving coil L1, a Schottky diode D1, a Zener diode D2, a capacitor C2, a capacitor C3, a resistor R5, and a transistor Q1. The receiving coil L1 receives energy from the transmitter inside the instrument; One end of the receiving coil L1 is connected to one end of capacitor C2, one end of capacitor C3, and the anode of Zener diode D2 and grounded; The other end of the receiving coil L1 and the other end of the capacitor C3 are connected to the anode of the Schottky diode D1. The cathode of the Schottky diode D1 is connected to one end of the resistor R5 and the collector of the transistor Q1. The other end of the resistor R5 is connected to the cathode of the Zener diode D2 and the base of the transistor Q1. The emitter of the transistor Q1 is connected to both the voltage reference circuit and the Bluetooth system controller.

3. The quartz vortex tube circuit for calibrating an automatic vortex apparatus as described in claim 1, characterized in that, The voltage reference circuit is a precision voltage reference REF3030.

4. The quartz vortex tube circuit for calibrating an automatic vortex apparatus as described in claim 1, characterized in that, The Bluetooth system controller includes a Bluetooth MCU with CC2340R5 as its core.

5. The quartz cyclotron circuit for calibrating an automatic cyclotron as described in claim 1, characterized in that, The wireless power receiving circuit and the Bluetooth system controller include resistors R3 and R4 and capacitor C5. One end of resistor R4 is connected to the output terminal of the wireless power receiving circuit, and the other end of resistor R4 is connected to one end of resistor R3 and the differential input interface of the Bluetooth system controller. The other end of resistor R3 and one end of capacitor C5 are grounded, and the other end of capacitor C5 is connected to the analog input terminal of the Bluetooth system controller.

6. The quartz vortex tube circuit for calibrating an automatic vortex apparatus as described in claim 1, characterized in that, The Bluetooth system controller and the measurement system are connected via an SPI interface.

7. The quartz cyclotron circuit for calibrating an automatic cyclotron as described in claim 1, characterized in that, The measurement system is an LTC2410 integrated circuit.

8. The quartz cyclotron circuit for calibrating an automatic cyclotron as described in claim 1, characterized in that, The temperature sensor consists of resistors R1 and R2 connected in series. Resistor R1 is a precision resistor, and resistor R2 is a thermistor. The temperature sensor generates a differential signal at the input terminal of the integrated circuit LTC2410.

9. A quartz cyclotron circuit for calibrating an automatic cyclotron, as described in claim 8, characterized in that, The resistor R2 is a Pt1000 thermal resistor.

10. The quartz vortex tube circuit for calibrating an automatic vortex apparatus as described in claim 1, characterized in that, This includes a bypass capacitor C4, one end of which is connected to the output of the wireless power receiving circuit and the input of the voltage reference circuit, while the other end is grounded.

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