CN210603593U - Miniature spectrometer control circuit - Google Patents
Miniature spectrometer control circuit Download PDFInfo
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- CN210603593U CN210603593U CN201921528665.4U CN201921528665U CN210603593U CN 210603593 U CN210603593 U CN 210603593U CN 201921528665 U CN201921528665 U CN 201921528665U CN 210603593 U CN210603593 U CN 210603593U
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Abstract
The utility model relates to a miniature spectrum appearance control circuit relates to miniature spectral detection technical field. The utility model relates to a miniature spectrum appearance control circuit is connected with the circuit mode by linear array CCD, the changeable preamplifier circuit of gain and adjustable direct current voltage biasing circuit, driver chip, analog to digital converter, field programmable gate array, external control circuit, ARM treater, PC host computer and external light source signal and constitutes. To sum up, the utility model relates to a miniature spectrum appearance control circuit has the direct current offset's that can dynamic elimination linear array CCD dark current caused influence, has enlarged miniature spectrum appearance to the intensity accommodation of input detection optical signal simultaneously. Because the gain selection and the direct current bias adjustment are realized by adopting a Field Programmable Gate Array (FPGA) hardware circuit, the adjustment is fast and convenient.
Description
Technical Field
The utility model relates to a miniature spectral detection technical field specifically indicates a can dynamically change miniature spectrum appearance to the control circuit of input detection optical signal's intensity accommodation.
Background
The micro spectrometer is a core component in a spectral measurement system, is convenient for flexibly building the spectral system due to small volume, and is widely applied to the fields of environmental monitoring, industrial control, chemical analysis, food quality detection, material analysis, clinical examination, aerospace remote sensing, scientific education and the like.
The control circuit of the traditional micro spectrometer consists of a linear array CCD, a preposed amplifying and biasing circuit, a CPLD driving circuit, an analog-to-digital converter, a memory and a processor. The working process of the control circuit is that the external equipment transmits a command through a USB or RS232 interface of the micro spectrometer, a processor in the control circuit analyzes the command, the CPLD is controlled to generate a time sequence for reading the linear array CCD, a CCD output signal is transmitted to the analog-to-digital converter through the preamplifier and the bias circuit, converted data is stored in a memory, and the data is processed by the processor and then returned to the external equipment.
The pre-amplification and bias circuits in the control circuit of the traditional micro spectrometer respectively adjust the amplification factor and the bias voltage by two potentiometers, the numerical value of the potentiometer is fixed after factory debugging, and the potentiometer is not adjustable in actual use. Therefore, when the external detection light signal is weak, the control circuit of the conventional micro spectrometer can only obtain a spectrum signal with sufficient intensity by setting the integration time of the linear array CCD, and the weaker the light signal, the longer the integration time is required, which results in the longer the measurement time. In addition, when the external detection light signal is strong, the preamplifier may be saturated at the minimum integration time, resulting in failure to acquire its spectral data. Because the voltage of the bias circuit is fixed, when the dark current of the linear array CCD changes along with the ambient temperature, the output of the preamplification circuit is also influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the shortcoming and not enough that prior art exists, provide a but dynamic selection preamplifier gain and bias voltage's control circuit.
The utility model relates to a miniature spectrum appearance control circuit comprises linear array CCD, the changeable preamplification circuit of gain and adjustable DC voltage biasing circuit, driver chip, analog to digital converter, Field Programmable Gate Array (FPGA), external control circuit, ARM treater, PC host computer and external light source. The ARM processor pin is connected with a Field Programmable Gate Array (FPGA), and a driving signal generated by the FPGA is connected with the linear array CCD through a driving chip; the output signal of the linear array CCD enters an analog-to-digital converter through a pre-amplification circuit with variable gain; the analog-to-digital converter is connected with a Field Programmable Gate Array (FPGA); the adjustable direct current voltage bias circuit is connected with the pre-amplification circuit with variable gain to provide a direct current bias signal; a control signal line of the adjustable direct current voltage bias circuit is connected with a Field Programmable Gate Array (FPGA); the ARM processor is connected with the PC upper computer through a USB or RS232 interface; the Field Programmable Gate Array (FPGA) is connected with an external control circuit; the external control circuit is used for outputting a control signal for turning on and off the external light source. The operational amplifiers A1 and A2 and the resistors R1, R2, R5 and R6 jointly form a pre-amplification circuit with variable gain; the digital potentiometer B and the resistors R3 and R4 form an adjustable direct current voltage bias circuit. The output signal VIN of the linear array CCD is connected with the negative input end-of the operational amplifier A1 through a resistor R1; the positive input end + of A1 is connected with the adjustable DC voltage bias circuit, and the output end of A1 is connected with the positive input end + of the operational amplifier A2. Output signals VO1 and VO2 of A1 and A2 respectively enter a channel 1 and a channel 2 of the analog-to-digital converter, and a control signal of a digital potentiometer B is connected with a Field Programmable Gate Array (FPGA) through an SPI interface.
As described above, the utility model relates to a miniature spectrum appearance control circuit can eliminate the DC offset's that linear array CCD dark current caused influence dynamically, has enlarged miniature spectrum appearance to the intensity accommodation of input detection optical signal simultaneously. Because the gain selection and the direct current bias adjustment are realized by adopting a Field Programmable Gate Array (FPGA) hardware circuit, the adjustment is fast and convenient.
Drawings
Fig. 1 is a block diagram of a control circuit of a micro spectrometer according to the present invention;
fig. 2 is a circuit diagram of an embodiment of the present invention.
Description of the numbering
1: linear array CCD;
2: a variable gain preamplifier circuit;
3: an adjustable dc voltage bias circuit;
4: a driving chip;
5: an analog-to-digital converter;
6: a Field Programmable Gate Array (FPGA);
7: an external control circuit;
8: an ARM processor;
9: a PC upper computer;
10: an external light source signal.
Detailed Description
The invention will be further described with reference to the following figures and examples
The utility model relates to a miniature spectrometer control circuit (as shown in figure 1, figure 2):
the device is formed by connecting a linear array CCD1, a gain-variable pre-amplification circuit 2, an adjustable direct-current voltage bias circuit 3, a driving chip 4, an analog-to-digital converter 5, a field programmable gate array 6, an external control circuit 7, an ARM processor 8, a PC upper computer 9 and an external light source signal 10 in a circuit mode.
The field programmable gate array 6 is respectively connected with the analog-to-digital converter 5 and the ARM processor 8, is connected with the external control circuit 7, is connected with the direct-current voltage bias circuit 3 through a control signal line, and is connected with the linear array CCD1 through the driving chip 4 at the other end.
The output signal of the linear array CCD1 is connected with an analog-to-digital converter 5 through a pre-amplification circuit 2 with variable gain.
The ARM processor 8 is connected with a PC upper computer 9 through a USB or RS232 interface.
The external control circuit 7 is connected to an external light source signal 10.
The adjustable direct current voltage bias circuit 3 is connected with the pre-amplification circuit 2 with variable gain.
The pre-amplifier circuit 2 with variable gain is formed by connecting an operational amplifier A1, an operational amplifier A2, a resistor R1, a resistor R2, a resistor R5 and a resistor R6.
The dc voltage bias circuit 3 is formed by connecting a digital potentiometer B to a resistor R3 and a resistor R4.
The output signal VIN of the linear array CCD1 is connected with the negative input end-of the operational amplifier A1 through a resistor R1.
The positive input terminal + of the operational amplifier A1 is connected with the adjustable DC voltage bias circuit 3, and the output terminal of the operational amplifier A1 is connected with the positive input terminal + of the operational amplifier A2.
The operational amplifier a1 and the output signals VO1, VO2 of the operational amplifier a2 are connected to channel 1 and channel 2 of the analog-to-digital converter 5, respectively.
The control signal of the digital potentiometer B is connected with the field programmable gate array 6 through an SPI interface.
The operational amplifiers A1 and A2 adopt a high-speed operational amplifier AD 8031.
The digital potentiometer B adopts MCP 41010.
To sum up, the utility model relates to a miniature spectrum appearance control circuit has the direct current offset's that can dynamic elimination linear array CCD dark current caused influence, has enlarged miniature spectrum appearance to the intensity accommodation of input detection optical signal simultaneously. Because the gain selection and the direct current bias adjustment are realized by adopting a Field Programmable Gate Array (FPGA) hardware circuit, the adjustment is fast and convenient.
Claims (3)
1. A micro spectrometer control circuit is characterized by being formed by connecting a linear array CCD (1), a gain-variable preamplification circuit (2), an adjustable direct-current voltage bias circuit (3), a driving chip (4), an analog-to-digital converter (5), a field programmable gate array (6), an external control circuit (7), an ARM processor (8), a PC upper computer (9) and an external light source signal (10) in a circuit mode;
the field programmable gate array (6) is respectively connected with an analog-to-digital converter (5) and an ARM processor (8) pin, is connected with an external control circuit (7), is connected with a direct-current voltage bias circuit (3) through a control signal line, and is connected with a linear array CCD (1) through a driving chip (4);
the output signal of the linear array CCD (1) is connected with an analog-to-digital converter (5) through a pre-amplification circuit (2) with variable gain;
the ARM processor (8) is connected with a PC upper computer (9) through a USB or RS232 interface;
the external control circuit (7) is connected with an external light source signal (10);
the adjustable direct current voltage bias circuit (3) is connected with the pre-amplification circuit (2) with variable gain.
2. The control circuit of a micro spectrometer as claimed in claim 1, wherein the pre-amplifier circuit (2) with variable gain is formed by connecting an operational amplifier A1, an operational amplifier A2, a resistor R1, a resistor R2, a resistor R5 and a resistor R6;
the direct-current voltage bias circuit (3) is formed by connecting a digital potentiometer B with a resistor R3 and a resistor R4;
the output signal VIN of the linear array CCD (1) is connected with the negative input end-of the operational amplifier A1 through a resistor R1;
the positive input end + of the operational amplifier A1 is connected with the adjustable direct-current voltage bias circuit (3), and the output end of the operational amplifier A1 is connected with the positive input end + of the operational amplifier A2;
the operational amplifier A1 and output signals VO1 and VO2 of the operational amplifier A2 are respectively connected with a channel 1 and a channel 2 of the analog-digital converter (5);
the control signal of the digital potentiometer B is connected with a field programmable gate array (6) through an SPI interface.
3. The control circuit of a micro spectrometer as in claim 2, wherein the operational amplifiers a1, a2 are high speed operational amplifiers AD 8031; the digital potentiometer B adopts MCP 41010.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921528665.4U CN210603593U (en) | 2019-09-16 | 2019-09-16 | Miniature spectrometer control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921528665.4U CN210603593U (en) | 2019-09-16 | 2019-09-16 | Miniature spectrometer control circuit |
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| Publication Number | Publication Date |
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| CN210603593U true CN210603593U (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921528665.4U Active CN210603593U (en) | 2019-09-16 | 2019-09-16 | Miniature spectrometer control circuit |
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| CN (1) | CN210603593U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110455411A (en) * | 2019-09-16 | 2019-11-15 | 上海仪电物理光学仪器有限公司 | A kind of micro spectrometer control circuit and control method |
-
2019
- 2019-09-16 CN CN201921528665.4U patent/CN210603593U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110455411A (en) * | 2019-09-16 | 2019-11-15 | 上海仪电物理光学仪器有限公司 | A kind of micro spectrometer control circuit and control method |
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