CN214408690U - Hand-held fluorescence detector - Google Patents
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- CN214408690U CN214408690U CN202023340553.1U CN202023340553U CN214408690U CN 214408690 U CN214408690 U CN 214408690U CN 202023340553 U CN202023340553 U CN 202023340553U CN 214408690 U CN214408690 U CN 214408690U
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Abstract
The utility model relates to a hand-held type fluorescence detector, including draw-in groove, first photoelectric switch, second photoelectric switch, light source, light path system to and photoelectric sensor, signal amplification circuit, peak hold circuit, microprocessor and analog-to-digital converter that connect gradually. The first photoelectric switch and the second photoelectric switch are installed on the clamping groove and sequentially sense the reagent card inserted into the clamping groove. The optical path system comprises a first convex lens, a dichroic mirror, a second convex lens, an optical filter and a third convex lens; light emitted by the light source sequentially passes through the first convex lens, is reflected to the second convex lens through the dichroic mirror, passes through the second convex lens and forms a light spot on a tested reagent card, and exciting light sequentially passes through the second convex lens, the dichroic mirror, the optical filter and the third convex lens to the photoelectric sensor. The detector has precise optical excitation and collection detection systems, can independently collect the signals of the quality control line and the test line position of the reagent card, has small calculated amount and high speed, and can realize smaller volume by the tester.
Description
Technical Field
The utility model relates to a fluorescence analysis appearance field especially relates to a hand-held type fluorescence detector.
Background
The immunoassay technology is an important medical detection means and is an important component in the field of modern medical detection. The immunoassay technology is based on the phenomenon of specific binding of an antigen to an antibody, and measures the content of one of the antigen or the antibody by labeling the other. Among various immunoassay techniques, immunofluorescence assay techniques have been developed rapidly in recent years due to the characteristics of simple preparation of markers, multiple markers, repeatable testing, and the like. Immunofluorescence analysis techniques are divided into several techniques, such as Time Resolved Fluoroimmunoassay (TRFIA), Fluorescence Polarization Immunoassay (FPIA), and Fluorogenic Enzyme Immunoassay (FEIA), and TRFIA has a wide application prospect. The TRFIA technology is a novel ultramicro analysis method, and separates specific fluorescence from non-specific fluorescence, so that the fluorescence immunoassay precision is greatly improved. At present, the foreign TRFIA technology has stepped into the 3 rd era, the full-automatic detection function is basically realized, the TRFIA technology is widely applied to clinical diagnosis, and the emerging technology is continuously developed. At present, many enterprises for researching and developing immunofluorescence analyzers are available in China, but the related fields in China lack standardization. In another situation, many large-scale time-resolved fluoroimmunoassay detection instruments are used for clinical detection, but less portable instruments for POCT applications are developed.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is that the miniaturized immunofluorescence analyzer in China has fewer products, the equipment is basically desk-top, and the handheld equipment is few.
In order to solve the technical problem, the utility model provides a hand-held type fluorescence detector, it includes draw-in groove, first photoelectric switch, second photoelectric switch, light source, light path system to and photoelectric sensor, signal amplification circuit, peak hold circuit, microprocessor and the analog-to-digital converter that connects gradually, first photoelectric switch and second photoelectric switch connect respectively in microprocessor. The first photoelectric switch and the second photoelectric switch are installed on the clamping groove and sequentially sense the reagent cards inserted into the clamping groove.
The optical path system comprises a first convex lens, a dichroic mirror, a second convex lens, an optical filter and a third convex lens. The light emitted by the light source sequentially penetrates through the first convex lens, is reflected to the second convex lens by the dichroic mirror, penetrates through the second convex lens and forms a light spot on a tested reagent card, and the exciting light sequentially penetrates through the second convex lens, the dichroic mirror, the optical filter and the third convex lens to reach the photoelectric sensor.
The distance from the first photoelectric switch to the light spot is equal to the distance from the reagent card insertion front edge to the quality control line of the reagent card; the distance from the second photoelectric switch to the light spot is equal to the distance from the reagent card insertion front edge to the detection line of the reagent card.
As the utility model discloses a hand-held type fluorescence detector's further improvement, the light source is the ultraviolet lamp, fluorescence detector still includes constant current LED drive circuit, constant current LED drive circuit connect in the ultraviolet lamp.
As a further improvement of the handheld fluorescence detector of the present invention, the left side of the dichroic mirror disposed at an inclination of 45 ° is the first convex lens disposed vertically, the second convex lens disposed horizontally is disposed below, and the optical filter disposed horizontally is disposed above; the light source is arranged on the left side of the first convex lens; the clamping groove is arranged below the second convex lens; the third convex lens is arranged above the optical filter; the photoelectric sensor is arranged above the third convex lens.
As a further improvement of the handheld fluorescence detector of the present invention, the first convex lens, the second convex lens and the third convex lens are all plano-convex lenses; the convex surfaces of the first convex lens, the second convex lens and the third convex lens face the dichroic mirror.
As a further improvement of the handheld fluorescence detector of the present invention, the light source is disposed at the left focus of the first convex lens, and the slot is disposed at the lower focus of the second convex lens; the photoelectric sensor is arranged at the upper focus of the third convex lens.
As a further improvement of the handheld fluorescence detector of the present invention, the signal amplification circuit includes a charge sensitive pre-amplification circuit and a secondary amplification circuit connected to each other, the charge sensitive pre-amplification circuit is connected to the photoelectric sensor, and the secondary amplification circuit is connected to the peak hold circuit; the charge sensitive preamplification circuit is provided with a first integrated operational amplifier; the second-stage amplifying circuit is provided with a second integrated operational amplifier.
As a further improvement of the handheld fluorescence detector of the present invention, the first integrated operational amplifier is grounded through one pin, and is connected with the double capacitor through the other pin; the charge sensitive preamplification circuit is provided with a first capacitor, and two ends of the first capacitor are respectively and directly connected with the inverting input end and the output end of the first integrated operational amplifier; the non-inverting input end of the first integrated operational amplifier is connected with a first bias electrode.
As a further improvement of the handheld fluorescence detector of the present invention, two ends of the first capacitor are further connected in parallel with a first feedback resistor; the inverting input end of the first integrated operational amplifier is also connected with the output end of a first resistor, and the input end of the first resistor is respectively connected with the photoelectric sensor, the first grounding capacitor and the secondary amplifying circuit; the output end of the first integrated operational amplifier is also connected with a second resistor, and the second resistor is connected with the second-stage amplifying circuit.
As a further improvement of the handheld fluorescence detector of the present invention, the output of the charge sensitive preamplifier circuit is a voltage signal in direct proportion to the photocurrent, and the simplified relationship between the output voltage and the input current is Uout1＝R*IPDWherein U isout1For the first stage of the circuit to output a voltage signal, R being the resistance of said first feedback resistor, IPDThe current input to the photosensor.
As a further improvement of the handheld fluorescence detector of the present invention, in the second-stage amplifying circuit, the non-inverting input terminal of the second integrated operational amplifier is connected to the front end of the third resistor and the second grounded capacitor, and the input terminal of the third resistor is connected to the output terminal of the second resistor, the input terminal of the second capacitor and the input terminal of the first resistor; and the inverting input end of the second integrated operational amplifier is respectively connected with a fourth resistor and a second feedback resistor, and the other end of the fourth resistor is connected with a third grounding capacitor and a second bias electrode.
As the utility model discloses a hand-held type fluorescence detector's further improvement, the front end of sixth resistance is connected to the output of the integrated operational amplifier of second, the output of sixth resistance connect respectively in peak hold circuit and second feedback resistance R56 and second electric capacity C71's output.
As a further improvement of the handheld fluorescence detector, the second-stage amplifying circuit is a forward proportional amplifying circuit, and the amplification factor is Uout2＝2*Uout1-Ubias1VWherein U isout2For the second stage output signal of the circuit, Ubias1VIs a bias voltage.
The utility model discloses use indirect immunofluorescence detection method as the basis, combine immunochromatography technique, time resolution fluorescence immunity technique to and utilize embedded microprocessor technique and photoelectric sensor technical means, developed one and had the short-term test function, easy operation makes things convenient for the hand-held type fluorescence detector of miniaturization of witnessed inspections. The utility model discloses a hand-held type fluorescence detector application time-resolved fluorescence analysis method comes to carry out quick test like the forbidden medicine to the determinand according to the light beam of fluorescence analysis transmission, has characteristics such as high SNR, high resolution, high wavelength precision, accomplishes the detection fast, can be used to the detection of hair trace drugs, easily satisfies the demand of people to the qualitative and quantitative analysis and the scientific research of forbidden medicine.
Drawings
Fig. 1 is a diagram of an optical system of the handheld fluorescence detector of the present invention.
Fig. 2 is a circuit diagram of the constant current LED driving circuit of the present invention.
FIG. 3 is a block diagram of a reagent card undergoing testing.
Fig. 4 is a waveform diagram of the fluorescence intensity signal focused on the photosensor converted into a weak electrical signal and amplified.
Fig. 5 and 6 are circuit diagrams of the signal amplification circuit of the present invention.
Fig. 7 is a circuit diagram of the limit of the photoelectric switch in the first photoelectric switch and the second photoelectric switch.
Fig. 8 is a circuit diagram of the peak hold circuit of the present invention.
Fig. 9 is a waveform diagram before and after peak holding.
Reference numerals: the device comprises a light source 1, a photoelectric sensor 2, a first convex lens 3, a dichroic mirror 4, a second convex lens 5, an optical filter 6, a third convex lens 7, a reagent card 8, an insertion front edge 80, a charge sensitive pre-amplification circuit 9 and a secondary amplification circuit 10.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a handheld fluorescence detector, which includes a card slot, a first photoelectric switch, a second photoelectric switch, a light source 1, a light path system, and a photoelectric sensor 2, a signal amplifying circuit, a peak holding circuit, a microprocessor, and an analog-to-digital converter, which are connected in sequence. The first photoelectric switch and the second photoelectric switch are arranged on the clamping groove and sequentially sense the reagent card 8 inserted into the clamping groove. The first photoelectric switch and the second photoelectric switch are connected to the microprocessor.
The optical path system comprises a first convex lens 3, a dichroic mirror 4, a second convex lens 5, an optical filter 6 and a third convex lens 7. As shown in fig. 1, a first convex lens 3 is vertically arranged on the left side of a dichroic mirror 4 arranged obliquely at 45 degrees, a second convex lens 5 is horizontally arranged below the dichroic mirror, and a filter 6 is horizontally arranged above the dichroic mirror; the light source 1 is arranged on the left side of the first convex lens 3; the clamping groove is arranged below the second convex lens 5; the third convex lens 7 is arranged above the optical filter 6; the photosensor 2 is disposed above the third convex lens 7.
The first convex lens 3, the second convex lens 5 and the third convex lens 7 are all plano-convex lenses; the convex surfaces of the first convex lens 3, the second convex lens 5, and the third convex lens 7 are all directed toward the dichroic mirror 4.
Specifically, the light source 1 is arranged at the left focus of the first convex lens 3, and the clamping groove is arranged at the lower focus of the second convex lens 5; the photosensor 2 is disposed at the upper focal point of the third convex lens 7.
The utility model discloses a light source 1 is the ultraviolet lamp, and fluorescence detector still includes constant current LED drive circuit, and constant current LED drive circuit connects in the ultraviolet lamp, and constant current LED drive circuit's circuit diagram is shown in fig. 2, and it makes the ultraviolet lamp send controllable ultraviolet ray.
Light emitted by the light source 1 penetrates through the first convex lens 3 to form parallel light which is emitted to the dichroic mirror 4, the parallel light is reflected to the second convex lens 5 through the dichroic mirror 4 and is converged on a tested reagent card 8 through the second convex lens 5 to form a light spot, a fluorescent part excited on the reagent card 8 upwards penetrates through the second convex lens 5 to become the parallel light, the parallel light penetrates through the dichroic mirror 4 and the optical filter 6, the optical filter 6 is mainly a light source which does not need a waveband for filtering, and is mainly an ultraviolet light source, and a fluorescent signal needed by testing is reserved. The parallel light transmitted through the optical filter 6 continuously transmits through the third convex lens and is converged on the photoelectric sensor.
Referring to fig. 3, it is a schematic diagram of a structure of a reagent card 8, where the reagent card 8 is also called an immunochromatography reagent strip, and a sample application region is disposed at a rear end of the reagent card 8 and used for dropping a sample solution to be tested, and after the chromatographic expansion, the expansion region has a detection line and a quality control line, and a plurality of detection windows are disposed above the expansion region for the reagent card 8. The first photoelectric switch and the second photoelectric switch are mounted on the card slot, and sequentially sense the reagent card 8 inserted into the card slot, and the distance from the first photoelectric switch to a light spot formed on the reagent card 8 is specifically designed to be equal to the distance from the insertion front edge 80 of the reagent card 8 to a quality control line (also called as "C line") of the reagent card; the distance from the second opto-electronic switch to the light spot formed on the reagent card 8 is equal to the distance from the reagent card 8 insertion front edge 80 to the detection line (also referred to as the "T-line") of the reagent card.
The utility model discloses in, the optical system that light source 1, light path system, photoelectric sensor 2 constitute is hand-held type fluorescence detector's core part. The light source 1 generates monochromatic light with a wavelength similar to the absorption wavelength of the fluorescent marker, and the monochromatic light passes through the optical system and then irradiates a single scanning point (i.e., a detection window) of the reagent card 8. The fluorescent substance near the scanning point is stimulated to emit fluorescence, and the fluorescence is collected and focused into an effective receiving target surface of the photoelectric sensor 2 by the collecting light path. In the process of measuring the reagent card 8, it is necessary to detect the fluorescence intensity distribution of the detection line and the quality control line of the reagent card 8. If a photodiode is used solely as the photoelectric conversion device, the fluorescence intensity in only a single spot can be detected per conversion. In order to detect the whole reagent strip, the reagent card 8 needs to be detected in a scanning manner, and in the process that the reagent card 8 is manually inserted into the card slot of the detector, the light spot moves on the reagent card 8, that is, the reagent card 8 is detected in a scanning manner, the fluorescence intensity signal focused on the photoelectric sensor 2 is converted into a weak electric signal, and the weak electric signal is amplified by the signal amplification circuit to form the waveform shown in fig. 4. The positions of the T line and the C line are marked by using the first photoelectric switch and the second photoelectric switch as trigger points, after the first photoelectric switch and the second photoelectric switch are triggered, a trigger signal is transmitted to the microprocessor, and the microprocessor starts the analog-to-digital converter to convert an amplified electric signal into a digital signal and sends the digital signal to the microprocessor for calculation and quantitative analysis.
The utility model discloses a hand-held type fluorescence detector detects this immunochromatography reagent strip's process as follows:
(1) placing a sample to be detected in a sample adding area of the chromatographic reagent strip, and waiting for the chromatographic action and the immunoreaction process to be fully completed; inserting the reagent card 8 into the card slot;
(2) irradiating a first detection point in a detection window of the reagent card 8 by using the ultraviolet light source 1 and the light path system, and exciting fluorescence by using a to-be-detected combination marked by fluorescein in the detection point;
(3) converting the optical signal into an electrical signal by using a silicon photodiode (namely, the photoelectric sensor 2), further amplifying the electrical signal, converting the electrical signal into a digital signal and transmitting the digital signal to the microprocessor;
(4) in order to detect the whole reagent strip, the system is enabled to detect the reagent strip in a scanning mode through a manual insertion mode;
(5) two photoelectric switches are reserved in the device, when the reagent card 8 is inserted, the reagent card 8 sequentially shields the first photoelectric switch and the second photoelectric switch, a trigger signal is sent to the microprocessor, the positions of the C line and the T line are marked in such a way, the reagent card can also be used as a detection signal for inserting the reagent strip, the microprocessor receives a signal of the photoelectric switches, starts the analog-to-digital converter to convert an electric signal of a fluorescence intensity value of a scanning point read by the photoelectric sensor into a digital signal, the digital signal is collected and recorded, the values of the C line and the T line are marked successively through the triggered photoelectric switches, and finally the numerical value is calculated through the microcontroller.
Wherein, the utility model discloses a photoelectric sensor 2's effect is for receiving the fluorescence signal that is surveyed reagent card 8 arouses, turns into weak signal of telecommunication with fluorescence signal.
In order to effectively measure the value of a weak electric signal, the handheld fluorescence detector is provided with a signal amplification circuit to amplify the electric signal. Fig. 5 and 6 are circuit diagrams of a signal amplification circuit including a charge-sensitive pre-amplification circuit 9 (fig. 5) and a two-stage amplification circuit 10 (fig. 6) connected. The charge sensitive pre-amplifying circuit 9 is connected to the photoelectric sensor 2, and the secondary amplifying circuit 10 is connected to the peak holding circuit. The charge sensitive pre-amplification circuit 9 is provided with a first integrated operational amplifier; the secondary amplification circuit 10 is provided with a second integrated operational amplifier.
The first integrated operational amplifier is grounded through one pin, and is connected with double capacitors (C68 and C69 which are connected in parallel) through the other pin; a first capacitor C65 is arranged in the charge sensitive preamplification circuit 9, and two ends of the first capacitor C65 are respectively and directly connected with the inverting input end and the output end of the first integrated operational amplifier; the non-inverting input terminal of the first integrated operational amplifier is connected with a bias electrode.
The two ends of the first capacitor C65 are also connected with a first feedback resistor R28 in parallel; the inverting input end of the first integrated operational amplifier is further connected with the output end of a first resistor R30, and the input end of a first resistor R30 is respectively connected with the photoelectric sensor PD, a first grounding capacitor C70 and the second-stage amplifying circuit 10; the output end of the first integrated operational amplifier is further connected with a second resistor R61, and the second resistor R61 is connected with the second-stage amplifying circuit 10.
The charge sensitive preamplifier circuit 9 has a fast response speed, is suitable for a measurement system aiming at time and energy spectrum, and has the defect of small input impedance. The photodiode generates a photocurrent signal corresponding to the light intensity, the front end of the charge sensitive preamplification circuit 9 is a current-voltage conversion circuit which can output a voltage signal in a direct proportion relation with the photocurrent, and the simplified relation of the output voltage and the input current is as follows:
Uout1＝R28*IPD，
wherein U isout1R28 is the resistance of the first feedback resistor, IPDIs the current input by the photosensor. The capacitive reactance of the capacitor C65 is ignored in the equation. The function of the C65 is to make the circuit more stable and suppress the ringing phenomenon of the circuit. Of course, too much C65 will also result in too long a voltage settling time. In the circuit, the resistor R28 not only serves as a feedback resistor for dc but also serves to discharge the charge in the capacitor C65.
A circuit diagram of the two-stage amplification circuit 10 is shown in fig. 6. In the two-stage amplifying circuit 10, the non-inverting input terminal of the second integrated operational amplifier is connected to the front terminal of the third resistor R33 and the second grounded capacitor C72, and the input terminal of the third resistor R33 is connected to the output terminal of the second resistor R61, the input terminal of the second capacitor C71 and the input terminal of the first resistor R30; the inverting input end of the second integrated operational amplifier is respectively connected with a fourth resistor R55 and a second feedback resistor R56, and the other end of the fourth resistor R55 is connected with a third grounded capacitor C116 and a bias electrode. The output end of the second integrated operational amplifier is connected with the front end of a sixth resistor R31, and the output end of a sixth resistor R31 is respectively connected with the peak holding circuit and the output ends of a second feedback resistor R56 and a second capacitor C71.
The second-stage amplifying circuit 10 is a forward proportional amplifying circuit with an amplification factor of Uout2＝2*Uout1-Ubias1VWherein U isout2For the second stage output signal of the circuit, Ubias1VIs a bias voltage.
As shown in fig. 7, the first and second photoelectric switches are both provided with a photoelectric switch limit circuit, the left half of fig. 7 is a photoelectric switch limit circuit provided for the first photoelectric switch, and the right half of fig. 7 is a photoelectric switch limit circuit provided for the second photoelectric switch. In the test, the data of the reagent card 8 is tested in a scanning mode by manually inserting the reagent card 8, but the test data of the reagent card 8 mainly comprises a C line and a T line, when the reagent card 8 is inserted, the reagent card 8 shields the signal of the photoelectric switch, L _ SW1 and L _ SW2 in the graph 7 trigger high level to be sent to a microprocessor, and the microprocessor knows to turn on an analog-to-digital converter after receiving the signal to convert the electric signal into a digital signal for collecting and recording.
The photoelectric switch is used for positioning the positions of the C line and the T line, but there is a problem that the placement position of the photoelectric switch is affected by the assembling and welding aspects, and the position is deviated, so that the test data of different devices are likely to be deviated, and the accuracy is also reduced, so that the handheld fluorescence detector is additionally provided with a peak holding circuit, and the peak holding circuit diagram is shown in fig. 8. The peak hold circuit is connected between the signal amplification circuit and the microprocessor. The peak holding circuit can hold the highest peak voltage value of the C line and the T line, so that the accuracy of the position positioning of the photoelectric switches is not required as long as each photoelectric switch is ensured to be behind the C line or the T line which needs to be measured, and the waveform diagrams before and after the peak holding are shown in FIG. 9. Of course, after the C line is tested, the charge on the capacitor C73 in the peak hold circuit needs to be discharged (the C line is in front of the T line when the card is inserted, so that each test will test C first and then T), and data of the T line is prevented from being affected.
At present, most of devices are in a mode that a motor drives a reagent strip, so that a system records a spectrogram waveform of a whole test in a scanning mode, and then a microprocessor analyzes and calculates the acquired whole spectrogram to obtain data of a C line and a T line, and the whole system is complex. The system triggers photoelectric switches of the C line and the T line in a manual insertion mode, the positions of the C line and the T line are simply identified in such a mode, the time for inserting the reagent card is judged, meanwhile, a peak holding circuit is added to improve the test accuracy, the whole spectrogram is not needed for the acquired information, only signals of the positions of the C line and the T line are acquired independently, the calculated amount is small, the speed is high, the device and the test method are simple, and the tester can achieve a smaller size.
Claims (10)
1. A hand-held fluorescence detector, characterized by: the device comprises a clamping groove, a first photoelectric switch, a second photoelectric switch, a light source, a light path system, a photoelectric sensor, a signal amplification circuit, a peak holding circuit, a microprocessor and an analog-to-digital converter which are sequentially connected, wherein the first photoelectric switch and the second photoelectric switch are respectively connected with the microprocessor; the first photoelectric switch and the second photoelectric switch are arranged on the clamping groove and sequentially sense reagent cards inserted into the clamping groove;
the optical path system comprises a first convex lens, a dichroic mirror, a second convex lens, an optical filter and a third convex lens; the light emitted by the light source sequentially penetrates through the first convex lens, is reflected to the second convex lens by the dichroic mirror, penetrates through the second convex lens and forms a light spot on a tested reagent card, and the exciting light sequentially penetrates through the second convex lens, the dichroic mirror, the optical filter and the third convex lens to reach the photoelectric sensor;
the distance from the first photoelectric switch to the light spot is equal to the distance from the reagent card insertion front edge to the quality control line of the reagent card; the distance from the second photoelectric switch to the light spot is equal to the distance from the reagent card insertion front edge to the detection line of the reagent card.
2. The hand-held fluorescence detector of claim 1, wherein: the fluorescence detector also comprises a constant current LED drive circuit, and the constant current LED drive circuit is connected with the ultraviolet lamp.
3. The hand-held fluorescence detector of claim 1, wherein: the first convex lens is vertically arranged on the left side of the dichroic mirror which is inclined by 45 degrees, the second convex lens is horizontally arranged below the dichroic mirror, and the optical filter is horizontally arranged above the dichroic mirror; the light source is arranged on the left side of the first convex lens; the clamping groove is arranged below the second convex lens; the third convex lens is arranged above the optical filter; the photoelectric sensor is arranged above the third convex lens.
4. The hand-held fluorescence detector of claim 3, wherein: the first convex lens, the second convex lens and the third convex lens are all plano-convex lenses; the convex surfaces of the first convex lens, the second convex lens and the third convex lens face the dichroic mirror.
5. The hand-held fluorescence detector of claim 3, wherein: the light source is arranged at the left focus of the first convex lens, and the clamping groove is arranged at the lower focus of the second convex lens; the photoelectric sensor is arranged at the upper focus of the third convex lens.
6. The hand-held fluorescence detector of claim 1, wherein: the signal amplification circuit comprises a charge sensitive preamplification circuit and a secondary amplification circuit which are connected, the charge sensitive preamplification circuit is connected with the photoelectric sensor, and the secondary amplification circuit is connected with the peak holding circuit; the charge sensitive preamplification circuit is provided with a first integrated operational amplifier; the second-stage amplifying circuit is provided with a second integrated operational amplifier.
7. The hand-held fluorescence detector of claim 6, wherein: the first integrated operational amplifier is grounded through one pin, and is connected with the double capacitors through the other pin; the charge sensitive preamplification circuit is provided with a first capacitor, and two ends of the first capacitor are respectively and directly connected with the inverting input end and the output end of the first integrated operational amplifier; the non-inverting input end of the first integrated operational amplifier is connected with a first bias electrode.
8. The hand-held fluorescence detector of claim 7, wherein: two ends of the first capacitor are also connected with a first feedback resistor in parallel; the inverting input end of the first integrated operational amplifier is also connected with the output end of a first resistor, and the input end of the first resistor is respectively connected with the photoelectric sensor, the first grounding capacitor and the secondary amplifying circuit; the output end of the first integrated operational amplifier is also connected with a second resistor, and the second resistor is connected with the second-stage amplifying circuit.
9. The hand-held fluorescence detector of claim 8, wherein: in the secondary amplifying circuit, the non-inverting input end of a second integrated operational amplifier is connected with the front end of a third resistor and the input end of a second capacitor, and the input end of the third resistor is connected with the output end of the second resistor, the input end of the second capacitor and the input end of a first resistor; and the inverting input end of the second integrated operational amplifier is respectively connected with a fourth resistor and a second feedback resistor, and the other end of the fourth resistor is connected with a third grounding capacitor and a second bias electrode.
10. The hand-held fluorescence detector of claim 9, wherein: the output end of the second integrated operational amplifier is connected with the front end of a sixth resistor, and the output end of the sixth resistor is respectively connected with the peak holding circuit and the output ends of the second feedback resistor and the second capacitor.
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