On-line detection device and method with absorbance correction

Abstract

The present invention provides an online detection device and method with absorbance correction. The device includes a measuring chamber, an optical detection unit, and a transmission pipeline. The optical detection unit includes a light source, an optical fiber, and a detector. Measurement light emitted by the light source sequentially passes through the optical fiber and the measuring chamber before being transmitted to the detector via the optical fiber. The transmission pipeline connects to the measuring chamber. Furthermore, the device further includes: a shielding body with a safe zone and a dangerous zone on either side, the light source and the detector being located in the safe zone, the measuring chamber and the transmission pipeline being located in the dangerous zone, the measuring chamber being a liquid-core waveguide; two bubble detection units, each detecting bubbles in a liquid to be tested at two detection points upstream and downstream of the transmission pipeline; and a calculation unit located in the safe zone. The calculation unit uses parameters of the bubbles, the transmission pipeline, the measuring chamber, and the measurement light to derive the absorbance of the liquid to be tested. The present invention has advantages such as accurate detection.

Description

Technical Field

[0001] The present invention relates to liquid analysis, and in particular to an online detection device and method with absorbance correction. Background Art

[0002] When conducting some biological experiments, nuclear fuel experiments and other experiments involving radioactivity and toxicity, since modern analytical instruments cannot be used directly for analytical measurements, existing instruments must be appropriately modified and some components must be placed in a sealed system, i.e., a shielded room, to avoid the spillage of radiation and toxicity. This also creates difficulties in the sample transmission and analysis process.

[0003] When studying and analyzing lanthanides and actinides in solution, chemical analysis methods such as extraction, separation, and ion exchange are relatively cumbersome. Adjusting reaction conditions and operating procedures often alters the valence states of the elements, affecting accurate determination. Because each valence state of lanthanides and actinides exhibits characteristic absorption peaks, spectrophotometry allows for direct measurement without separation. Spectrophotometry quantitatively and qualitatively analyzes a substance by measuring its absorbance at a specific wavelength or within a range of wavelengths. The selectivity of a substance's absorption of light is governed by the Lambert-Beer law.

[0004] In the field of trace element research and analysis using spectrophotometry, liquid core waveguide capillary cells are used to improve the sensitivity and detection limit of analyzed samples, taking advantage of the high sensitivity of long optical pathlengths. However, during the measurement process, residual bubbles in the long optical path liquid flow cell can affect the detection signal, significantly reducing detection efficiency. When using liquid core waveguides, the most common method to avoid the influence of bubbles is to degas the capillary flow cell, as follows:

[0005] 1. Introduce a vacuum environment and place the liquid core waveguide tube in a vacuum container. Utilizing the transparent properties of Teflon AF material, tiny bubbles adsorbed on the inner wall can penetrate into the vacuum environment through the tube wall.

[0006] 2. Use gas-permeable microchannels to centrifuge and remove gas from the sample.

[0007] However, the above method is only applicable to the type I liquid-core waveguide with gas permeability of the capillary, and is not applicable to the type II liquid-core waveguide with a coating of the capillary. In addition, the centrifugal device will increase the complexity of the overall device and cause vibration, signal interference and other effects on the detection device. Summary of the Invention

[0008] In order to solve the deficiencies in the above-mentioned prior art solutions, the present invention provides an online detection device with absorbance correction.

[0009] The purpose of the present invention is achieved through the following technical solutions:

[0010] An online detection device with absorbance correction includes a measuring chamber, an optical detection unit, and a transmission pipeline. The optical detection unit includes a light source, an optical fiber, and a detector. The measuring light emitted by the light source sequentially passes through the optical fiber and the measuring chamber, and is then transmitted to the detector via the optical fiber. The transmission pipeline is connected to the measuring chamber. The online detection device with absorbance correction also includes:

[0011] A shielding body, wherein two sides of the shielding body are respectively a safe zone and a dangerous zone, the light source and the detector are arranged in the safe zone, the measuring chamber and the transmission pipeline are arranged in the dangerous zone, and the measuring chamber is a liquid core waveguide;

[0012] Two bubble detection units, the two bubble detection units respectively detecting bubbles in the liquid to be tested at two detection points upstream and downstream of the transmission pipeline;

[0013] a calculation unit located in the safety zone and configured to calculate the absorbance A of the liquid to be measured using parameters of the air bubble, the transmission pipe, the measurement chamber, and the measurement light;

[0014] N is the initial intensity of the measuring light emitted by the light source, N0 is the intensity of the measuring light received by the detector, D is the diameter of the transmission pipe, t is the time required for each bubble in the liquid to be measured to pass through any detection point, T is the time required for each bubble in the liquid to be measured to pass through two detection points, and l is the distance between the two detection points;

[0015]

[0016] R is the radius of the liquid core waveguide capillary, ζ is the refractive index of the measuring light in the liquid to be measured, ν is the kinematic viscosity of the liquid to be measured, ρ is the density of the liquid to be measured, T p is the temperature of the liquid to be measured, R e is the radius of curvature of the bubble, and λ is the wavelength of the measuring light.

[0017] The present invention also aims to provide an online detection method with absorbance correction, which is achieved by the following technical solutions:

[0018] An online detection method with absorbance correction, wherein the online detection method with absorbance correction is:

[0019] The liquid to be measured enters the transmission pipeline and the measuring chamber in the danger zone, and the measuring chamber is a liquid core waveguide;

[0020] Two bubble detection units respectively detect bubbles in the liquid to be tested at two detection points upstream and downstream of the transmission pipeline;

[0021] The measuring light emitted by the light source enters the liquid core waveguide through the optical fiber, passes through the liquid core waveguide and the optical fiber in sequence, is received by the detector, and the output signal is sent to the calculation unit; the light source, the detector and the calculation unit are located in a safe area;

[0022] The calculation unit uses the parameters of the bubble, the parameters of the transmission pipeline and the output signal to obtain the absorbance A of the liquid to be tested;

[0023] N is the initial intensity of the measuring light emitted by the light source, N0 is the intensity of the measuring light received by the detector, D is the diameter of the transmission pipe, t is the time required for each bubble in the liquid to be measured to pass through any detection point, T is the time required for each bubble in the liquid to be measured to pass through two detection points, and l is the distance between the two detection points;

[0024]

[0025] R is the radius of the liquid core waveguide capillary, ζ is the refractive index of the measuring light in the liquid to be measured, ν is the kinematic viscosity of the liquid to be measured, ρ is the density of the liquid to be measured, T p is the temperature of the liquid to be measured, R e is the radius of curvature of the bubble, and λ is the wavelength of the measuring light.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Good safety;

[0028] Through zoning, devices that require maintenance are placed in safe areas, while devices that do not require maintenance or have low maintenance frequency are placed in dangerous areas, significantly improving safety.

[0029] 2. Accurate test results;

[0030] Two bubble detection units are set up to obtain bubble information at two detection points upstream and downstream, and correct the absorbance calculation to eliminate the influence of bubbles on spectral data, significantly reducing the error of analysis results and improving detection accuracy;

[0031] The problem of bubbles entering the liquid core waveguide easily affecting the detection signal is solved, which can greatly improve the stability of the signal, making the liquid core waveguide detection method more reliable. It also solves the problem of residual bubbles in the long optical path liquid flow cell affecting the detection signal, greatly improving the detection efficiency.

[0032] The invention has a wide range of usage scenarios and has no restrictions on the model of liquid core waveguide; the device is simple and easy to operate; the device is less affected by environmental interference and is easy to debug and implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. Those skilled in the art will readily appreciate that these drawings are merely used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0034] Figure 1 3 is a schematic structural diagram of an online detection device with absorbance correction according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] Figure 1 The following description describes alternative embodiments of the present invention to teach those skilled in the art how to implement and reproduce the present invention. In order to teach the technical solution of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will understand that variations or substitutions derived from these embodiments will be within the scope of the present invention. Those skilled in the art will understand that the following features can be combined in various ways to form multiple variations of the present invention. Thus, the present invention is not limited to the following alternative embodiments, but is limited only by the claims and their equivalents.

[0036] Example 1:

[0037] Figure 1 The structure diagram of the online detection device with absorbance correction according to the embodiment of the present invention is schematically shown as follows: Figure 1 As shown, the online detection device with absorbance correction includes:

[0038] A measuring chamber, an optical detection unit, and a transmission pipeline. The optical detection unit includes a light source, an optical fiber, and a detector. The measuring light emitted by the light source sequentially passes through the optical fiber and the measuring chamber, and is then transmitted to the detector through the optical fiber. The transmission pipeline is connected to the measuring chamber.

[0039] A shielding body, wherein two sides of the shielding body are respectively a safe zone and a dangerous zone, the light source and the detector are arranged in the safe zone, the measuring chamber and the transmission pipeline are arranged in the dangerous zone, and the measuring chamber is a liquid core waveguide;

[0040] Two bubble detection units, the two bubble detection units respectively detecting bubbles in the liquid to be tested at two detection points upstream and downstream of the transmission pipeline;

[0041] a calculation unit, wherein the calculation unit uses the parameters of the bubble, the transmission pipe, the liquid core waveguide, and the measurement light to obtain the absorbance A of the liquid to be measured;

[0042] N is the initial intensity of the measuring light emitted by the light source, N0 is the intensity of the measuring light received by the detector, D is the diameter of the transmission pipe, t is the time required for each bubble in the liquid to be measured to pass through any detection point, T is the time required for each bubble in the liquid to be measured to pass through two detection points, and l is the distance between the two detection points;

[0043]

[0044] R is the radius of the liquid core waveguide capillary, ζ is the refractive index of the measuring light in the liquid to be measured, ν is the kinematic viscosity of the liquid to be measured, ρ is the density of the liquid to be measured, T p is the temperature of the liquid to be measured, R e is the radius of curvature of the bubble, and λ is the wavelength of the measuring light.

[0045] In order to improve the accuracy of bubble detection, the bubble detection unit further includes:

[0046] An optical transmitter module and an optical receiver module are provided in the safety zone. Light emitted by the optical transmitter module passes through the optical fiber, the transmission pipe, and the optical fiber in sequence, and is then received by the optical receiver module. The converted electrical signal is sent to the analysis module.

[0047] An analysis module is located in the safety zone and obtains bubble information according to changes in the electrical signal, wherein the bubble information includes parameters t and T.

[0048] In order to accurately detect bubbles in the liquid to be tested, further, parameter t is the time difference between the (2n-1)th change and the 2nth change of the electrical signal in the same detection point, n is a natural number, and parameter T is the time difference between the (2m-1)th change of the electrical signal in the downstream bubble detection and the 2mth change of the electrical signal in the upstream bubble detection, m is a natural number.

[0049] In order to obtain absorbance at different wavelengths, the online detection device with absorbance correction further includes:

[0050] The measuring light is a polychromatic light and the measuring light is received by the detector by the light splitting unit.

[0051] The online detection method with absorbance correction according to the embodiment of the present invention is as follows:

[0052] The liquid to be measured enters the transmission pipeline and the measuring chamber in the danger zone, and the measuring chamber is a liquid core waveguide;

[0053] Two bubble detection units respectively detect bubbles in the liquid to be tested at two detection points upstream and downstream of the transmission pipeline;

[0054] The measuring light emitted by the light source enters the liquid core waveguide through the optical fiber, passes through the liquid core waveguide and the optical fiber in sequence, is received by the detector, and the output signal is sent to the calculation unit; the light source, the detector and the calculation unit are located in a safe area;

[0055] The calculation unit uses the parameters of the bubble, the parameters of the transmission pipeline and the output signal to obtain the absorbance A of the liquid to be tested;

[0056] N is the initial intensity of the measuring light emitted by the light source, N0 is the intensity of the measuring light received by the detector, D is the diameter of the transmission pipe, t is the time required for each bubble in the liquid to be measured to pass through any detection point, T is the time required for each bubble in the liquid to be measured to pass through two detection points, and l is the distance between the two detection points;

[0057]

[0058] R is the radius of the liquid core waveguide capillary, ζ is the refractive index of the measuring light in the liquid to be measured, ν is the kinematic viscosity of the liquid to be measured, ρ is the density of the liquid to be measured, T p is the temperature of the liquid to be measured, R e is the radius of curvature of the bubble, and λ is the wavelength of the measuring light.

[0059] In order to improve the accuracy of bubble detection, the bubble parameters are further obtained as follows:

[0060] The light emitted by the optical transmitter module passes through the optical fiber, the transmission pipe and the optical fiber in sequence, and is then received by the optical receiver module, and the converted electrical signal is sent to the analysis module; the optical transmitter module and the optical receiver module are located in the safety zone;

[0061] The analysis module is in the safety zone and obtains bubble information according to changes in the electrical signal, where the bubble information includes parameters t and T.

[0062] In order to accurately detect bubbles in the liquid to be tested, further, parameter t is the time difference between the (2n-1)th change and the 2nth change of the electrical signal in the same detection point, n is a natural number, and parameter T is the time difference between the (2m-1)th change of the electrical signal in the downstream bubble detection and the 2mth change of the electrical signal in the upstream bubble detection, m is a natural number.

[0063] Example 2:

[0064] An example of application of the online detection device and method with absorbance correction according to Example 1 of the present invention in nuclear element detection.

[0065] In this application example, Figure 1 As shown, the upper side of the shield 3 is a safe area, and the lower side is a nuclear radiation danger zone; the transmission pipeline 2 and the measuring chamber 7 are arranged in the danger zone;

[0066] In the optical detection unit, the light source 1, the spectroscopic unit 12, the detector 8, and the calculation unit are arranged in the safe area, and the measuring chamber 7 adopts a liquid core waveguide and is arranged in the dangerous area. The optical fiber 10 passes through the shielding body 3, and the polychromatic measurement light emitted by the light source 1 passes through the optical fiber 10, the measuring chamber 7, and the optical fiber 10 in sequence, then enters the spectroscopic unit 12, and is finally received by the detector 8. The converted signal is sent to the calculation unit; the calculation unit is used to obtain the full-band absorbance A of the liquid to be measured in the transmission pipeline 2;

[0067] N is the initial light intensity of the measuring light emitted by the light source 1 at the wavelength λ, N0 is the light intensity of the measuring light received by the detector 8 at the wavelength λ, D is the diameter of the transmission pipe 2, t is the time required for each bubble in the liquid to be measured to pass through any detection point 4, 9, T is the time required for each bubble in the liquid to be measured to pass through the two detection points 4, 9, and l is the distance between the two detection points 4, 9;

[0068]

[0069] R is the radius of the liquid core waveguide capillary, ζ is the refractive index of the measuring light in the liquid to be measured, ν is the kinematic viscosity of the liquid to be measured, ρ is the density of the liquid to be measured, T p is the temperature of the liquid to be measured, R e is the radius of curvature of the bubble, and λ is the wavelength of the measuring light.

[0070] In the bubble detection unit, the optical transmission module 5, the optical receiving module 6 and the analysis module are arranged in a safe area; there are two (bubble) detection points 4 and 9 upstream and downstream of the transmission pipeline 2; the light emitted by the optical transmission module 5 passes through the optical fiber 11, the transmission pipeline 2 and the optical fiber 11 in sequence, and is then converted into an electrical signal by the optical receiving module 6 and sent to the analysis module, and the optical fiber 11 passes through the shielding body 3; the analysis module obtains bubble information based on the change of the electrical signal, and the bubble information includes parameters t and T; the parameter t is the time difference between the (2n-1)th change and the 2nth change of the electrical signal at the same detection point, where n is a natural number, and the parameter T is the time difference between the (2m-1)th change of the electrical signal in the downstream bubble detection (corresponding to the detection point 9) and the 2mth change of the electrical signal in the upstream bubble detection (corresponding to the detection point 4), where m is a natural number;

[0071] The online detection method with absorbance correction according to the embodiment of the present invention is as follows:

[0072] The sample flows through the two detection points 4 and 9 on the transmission pipe 2 and then enters the measurement chamber 7;

[0073] The two bubble detection units respectively detect the parameters of bubbles in the liquid to be tested at the two detection points 4 and 9. Specifically, the light receiving module 6 receives the light emitted by the light emitting module 5 and passing through the transmission pipe 2, converts it into an electrical signal, and sends it to the analysis module; the analysis module obtains bubble information according to the change of the electrical signal, and the bubble information includes parameters t and T; the parameter t is the time difference between the (2n-1)th change and the 2nth change of the electrical signal at the same detection point, where n is a natural number, and the parameter T is the time difference between the (2m-1)th change of the electrical signal in the downstream bubble detection (corresponding to the detection point 9) and the 2mth change of the electrical signal in the upstream bubble detection (corresponding to the detection point 4), where m is a natural number;

[0074] The light source 1 emits a complex color measurement light, which is then incident into the capillary of the measurement chamber 7 through the optical fiber 10. The measurement light emitted from the measurement chamber 7 is incident on the spectroscopic unit 12 through the optical fiber 10 for splitting. The detector 8 receives the light and finally sends it to the calculation unit.

[0075] The calculation unit obtains the full spectrum absorbance of the liquid to be tested based on the above parameters N is the initial intensity of the measuring light emitted by the light source, N0 is the intensity of the measuring light received by the detector, D is the diameter of the transmission pipe, t is the time required for each bubble in the liquid to be measured to pass through any detection point, T is the time required for each bubble in the liquid to be measured to pass through the two detection points 4 and 9, and l is the distance between the two detection points 4 and 9;

[0076]

[0077] R is the radius of the liquid core waveguide capillary, ζ is the refractive index of the measuring light in the liquid to be measured, ν is the kinematic viscosity of the liquid to be measured, ρ is the density of the liquid to be measured, T p is the temperature of the liquid to be measured, R e is the radius of curvature of the bubble, and λ is the wavelength of the measuring light.

[0078] The experimental results show that the error of the absorbance after correction is reduced as shown in the following table;

[0079]

Claims

1. An online detection device with absorbance correction, comprising a measurement chamber, an optical detection unit, and a transmission pipeline. The optical detection unit comprises a light source, an optical fiber, and a detector. The measurement light emitted by the light source sequentially passes through the optical fiber and the measurement chamber, and is then transmitted to the detector via the optical fiber. The transmission pipeline is connected to the measuring chamber; it is characterized in that: The online detection device with absorbance correction also includes: A shielding body, wherein two sides of the shielding body are respectively a safe zone and a dangerous zone, the light source and the detector are arranged in the safe zone, the measuring chamber and the transmission pipeline are arranged in the dangerous zone, and the measuring chamber is a liquid core waveguide; Two bubble detection units, the two bubble detection units respectively detecting bubbles in the liquid to be tested at two detection points upstream and downstream of the transmission pipeline; a calculation unit located in the safety zone and configured to calculate the absorbance A of the liquid to be measured using parameters of the air bubble, the transmission pipe, the measurement chamber, and the measurement light; N is the initial intensity of the measuring light emitted by the light source, N0 is the intensity of the measuring light received by the detector, D is the diameter of the transmission pipe, t is the time required for each bubble in the liquid to be measured to pass through any detection point, T is the time required for each bubble in the liquid to be measured to pass through two detection points, and l is the distance between the two detection points; R is the radius of the liquid core waveguide capillary, ζ is the refractive index of the measuring light in the liquid to be measured, ν is the kinematic viscosity of the liquid to be measured, ρ is the density of the liquid to be measured, T p is the temperature of the liquid to be measured, R e is the radius of curvature of the bubble, and λ is the wavelength of the measuring light.

2. The on-line detection device with absorbance correction according to claim 1, characterized in that The bubble detection unit comprises: An optical transmitter module and an optical receiver module are provided in the safety zone. Light emitted by the optical transmitter module passes through the optical fiber, the transmission pipe, and the optical fiber in sequence, and is then received by the optical receiver module. The converted electrical signal is sent to the analysis module. An analysis module is located in the safety zone and obtains bubble information according to changes in the electrical signal, wherein the bubble information includes parameters t and T.

3. The online detection device with absorbance correction according to claim 2, characterized in that Parameter t is the time difference between the (2n-1)th change and the 2nth change of the electrical signal in the same detection point, where n is a natural number. Parameter T is the time difference between the (2m-1)th change of the electrical signal in the downstream bubble detection and the 2mth change of the electrical signal in the upstream bubble detection, where m is a natural number.

4. The online detection device with absorbance correction according to claim 1 or 2, characterized in that The online detection device with absorbance correction also includes: The measuring light is a polychromatic light and the measuring light is received by the detector by the light splitting unit.

5. The online detection device with absorbance correction according to claim 1, characterized in that The shielding body is a nuclear radiation or poison shielding body.

6. An online detection method with absorbance correction, wherein the online detection method with absorbance correction is: The liquid to be measured enters the transmission pipeline and the measuring chamber in the danger zone, and the measuring chamber is a liquid core waveguide; Two bubble detection units respectively detect bubbles in the liquid to be tested at two detection points upstream and downstream of the transmission pipeline; The measuring light emitted by the light source enters the liquid core waveguide through the optical fiber, passes through the liquid core waveguide and the optical fiber in sequence, is received by the detector, and the output signal is sent to the calculation unit; the light source, the detector and the calculation unit are located in a safe area; The calculation unit uses the parameters of the bubble, the parameters of the transmission pipeline and the output signal to obtain the absorbance A of the liquid to be tested; N is the initial intensity of the measuring light emitted by the light source, N0 is the intensity of the measuring light received by the detector, D is the diameter of the transmission pipe, t is the time required for each bubble in the liquid to be measured to pass through any detection point, T is the time required for each bubble in the liquid to be measured to pass through two detection points, and l is the distance between the two detection points; R is the radius of the liquid core waveguide capillary, ζ is the refractive index of the measuring light in the liquid to be measured, ν is the kinematic viscosity of the liquid to be measured, ρ is the density of the liquid to be measured, T p is the temperature of the liquid to be measured, R e is the radius of curvature of the bubble, and λ is the wavelength of the measuring light.

7. The on-line detection method with absorbance correction according to claim 6, characterized in that The parameters of the bubbles are obtained as follows: The light emitted by the optical transmitter module passes through the optical fiber, the transmission pipe and the optical fiber in sequence, and is then received by the optical receiver module, and the converted electrical signal is sent to the analysis module; the optical transmitter module and the optical receiver module are located in the safety zone; The analysis module is located in the safety zone and obtains bubble information according to changes in the electrical signal, where the bubble information includes parameters t and T.

8. The on-line detection method with absorbance correction according to claim 7, characterized in that Parameter t is the time difference between the (2n-1)th change and the 2nth change of the electrical signal in the same detection point, where n is a natural number. Parameter T is the time difference between the (2m-1)th change of the electrical signal in the downstream bubble detection and the 2mth change of the electrical signal in the upstream bubble detection, where m is a natural number.

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