Multi-range online analyzer

Abstract

The multi-range online analyzer comprises a power adapter, a light source, a multi-position flow cell, a beam splitting optical fiber, an emergent optical fiber and a spectrograph, the light source and the spectrograph are connected with the power adapter, a connecting flow channel and a detection flow channel which are communicated with each other are arranged in the multi-position flow cell, one end of the connecting flow channel is a liquid inlet, and the other end of the connecting flow channel is a liquid outlet. N pairs of light incident ports and light emergent ports which enable light beams to enter and exit the detection flow channel are arranged outside the detection flow channel, a light channel is formed between any pair of light incident port and light emergent port, the lengths of the light channels are different, the beam splitting optical fiber splits light emitted by the light source into N beams and guides the N beams to the light incident ports, and the emergent optical fibers are connected with the light emergent ports and the spectrograph in a one-to-one manner. The multi-position flow cell with at least two optical channels with unequal optical paths is arranged in the multi-position flow cell, so that when a water sample is measured, at least two different detection ranges can be covered and simultaneously measured, and range switching is not needed while the range requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of water quality detection, in particular to a multi-range online analyzer. Background Art

[0002] Online analyzer is a water quality monitoring tool that can be used to monitor various parameters of groundwater, surface water, drinking water and other water bodies in real time to ensure the safety and quality of water resources. It is widely used in the field of water quality testing.

[0003] When monitoring water bodies, water samples of different concentrations within the conventional measurement range are often measured. At this time, it is usually necessary to set up multiple ranges for online monitoring. Since the optical path of conventional online analyzers in the spectroscopic system is designed to be consistent, there are currently two solutions for setting up multiple ranges: 1. Use multiple online analyzers during monitoring, and each online analyzer corresponds to a different range; 2. Use the internal range switching program of the online analyzer to repeatedly dilute high-concentration water samples for testing and switch the range to cope with the measurement of water samples of different concentrations.

[0004] Although the above two methods can solve the problem of setting multiple ranges and measuring water samples of different concentrations, they both have shortcomings. For example, when using method one, setting up multiple online analyzers requires a lot of financial resources. When using method two, the range switching procedure will greatly extend the test time and affect the timeliness of the water sample. Therefore, how to set multiple ranges and avoid the above defects becomes a problem. Utility Model Content

[0005] The utility model aims to provide a multi-range online analyzer, which covers multiple ranges and does not require range switching.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A multi-range online analyzer comprises a power adapter, a light source, a multi-position flow cell, a beam splitting optical fiber, N output optical fibers and N spectrometers; the light source and the spectrometer are respectively connected to the power adapter.

[0008] The multi-position flow cell comprises a flow cell body, in which a connecting flow channel and a plurality of detection flow channels are provided, the connecting flow channel is connected to each of the detection flow channels, and one end is set as a liquid inlet, and the other end is set as a liquid outlet, N pairs of light incident ports and light outlets are set on the outside of the detection flow channels, the light incident ports and the light outlets are used to allow light beams to enter and exit the detection flow channels, any pair of light incident ports and light outlets are arranged opposite to each other, and a light channel is formed therebetween, and the length of each of the light channels is different.

[0009] The beam splitting optical fiber is used to split the light emitted by the light source into N beams and guide them to each light input port respectively; the output optical fiber is arranged corresponding to the light output port and the spectrometer one by one, and connects the light input port and the spectrometer; wherein N is an integer, and N≥2.

[0010] Furthermore, there are N detection channels, all of which are linear channels. The lengths of the detection channels are different, and they are arranged one by one corresponding to the light incident port and the light exit port. The light incident port and the light exit port are arranged opposite to each other at the two ends of the detection channel.

[0011] Furthermore, the connecting flow channel is a linear flow channel, and the detection flow channels are arranged in parallel and sequentially along the length direction of the connecting flow channel.

[0012] Furthermore, the multi-position flow cell is an integrated glass component.

[0013] Furthermore, three detection channels are provided, and the beam splitting optical fiber is a one-to-three optical fiber.

[0014] Furthermore, the liquid inlet is located at the bottom of the multi-position flow cell, and the liquid outlet is located at the top of the multi-position flow cell.

[0015] Furthermore, the light source is a xenon lamp, a mercury lamp or a tungsten lamp, and the power adapter connects the light source and the spectrometer via an ultraviolet spectrum connecting line.

[0016] Furthermore, a peristaltic pump and a two-position three-way valve are arranged outside the liquid inlet, the peristaltic pump connects the liquid inlet and a common end of the two-position three-way valve, and the normally open end and the normally closed end of the two-position three-way valve are respectively connected to a pure water pipe and a sample tube.

[0017] The utility model has the following beneficial effects:

[0018] The utility model provides a multi-range online analyzer, which is provided with a multi-position flow cell, wherein N optical channels with different optical paths are provided in the multi-position flow cell, each optical channel corresponds to a different output end of a splitting optical fiber and a different spectrometer, and can provide different range selections. When the analyzer is in operation, it can cover and simultaneously perform measurements of at least two different detection ranges, and while meeting the range requirements, there is no need to switch the range, which can shorten the measurement cycle, improve work efficiency, avoid errors caused by inconsistent measurement time, and improve the accuracy and reliability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model.

[0020] Figure 2 This is a schematic diagram of the structure of the multi-position flow cell of the utility model.

[0021] Explanation of the main component symbols: 1. Power adapter; 2. Light source; 3. Multi-position flow cell; 4. Beam splitting optical fiber; 5. Output optical fiber; 6. Spectrometer; 7. Flow cell body; 8. Connecting channel; 9. Detection channel; 10. Liquid inlet; 11. Liquid outlet; 12. Light incident port; 12a. First light incident port; 12b. Second light incident port; 12c. Third light incident port; 13. Light exit port; 13a. First light exit port; 13b. Second light exit port; 13c. Third light exit port; 14. Optical channel; L, length of optical channel. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1 , 2 As shown, the utility model discloses a multi-range online analyzer, including a power adapter 1, a control mainboard, a light source 2, a multi-position flow cell 3, a beam splitting optical fiber 4, N output optical fibers 5 and N spectrometers 6. Among them, the power adapter 1 is communicatively connected to the control mainboard, the light source 2 and the spectrometer 6 are respectively connected to the power adapter 1 through ultraviolet spectrum connecting lines, the light source 2 adopts an ultraviolet light source 2, such as a xenon lamp, a mercury lamp or a tungsten lamp, N is an integer, and N≥2.

[0024] The multi-position flow cell 3 includes a flow cell body 7, an optical fiber fixing seat is arranged outside the flow cell body 7, and a connecting flow channel 8 and a plurality of detection flow channels 9 are opened inside. The connecting flow channel 8 connects the detection flow channels 9, and the two ends pass through the flow cell body 7, one end of which is set as a liquid inlet 10, and the other end is set as a liquid outlet 11. N pairs of light inlets 12 and light outlets 13 are arranged outside the detection flow channel 9, and the light inlets 12 and the light outlets 13 are used to allow light beams to enter and exit the detection flow channel 9. Any pair of light inlets 12 and light outlets 13 are arranged opposite to each other, and a light channel 14 is formed between them, and a pair of light inlets 12 and light outlets 13 corresponds to one light channel 14. The spacing between each pair of light inlets 12 and light outlets 13 is not equal, that is, the length L of each light channel 14 is not equal, and the optical path is not equal, which provides a basis for different range selection. The specific light channel 14 length L size setting is selected within the conventional measurement range according to demand.

[0025] A peristaltic pump and a two-position three-way valve are arranged outside the liquid inlet 10. The peristaltic pump is connected to the common end of the liquid inlet 10 and the two-position three-way valve. The normally open end and the normally closed end of the two-position three-way valve are respectively connected to a pure water pipe and a sample pipe. The liquid outlet 11 is externally connected to a waste liquid pipe, and a control valve is arranged at the waste liquid pipe. During the measurement, the water sample to be measured can be drawn from the sample pipe by the peristaltic pump, and the water sample to be measured can be passed through the liquid inlet 10 to fill the detection flow channel 9 for optical detection, and the water sample flowing out of the liquid outlet 11 can be concentrated and guided to the waste liquid collection place through the waste liquid pipe.

[0026] Preferably, the multi-position flow cell 3 is provided with N detection channels 9, all of which are linear channels. The lengths of the detection channels 9 are different, and they are arranged corresponding to the light incident port 12 and the light exit port 13 one by one. The light incident port 12 and the light exit port 13 are arranged relatively at the two ends of the detection channel 9, that is, each detection channel 9 corresponds to an optical channel 14, which is convenient for connecting with the optical fiber.

[0027] The connecting flow channel 8 is also a linear flow channel, and the detection flow channels 9 are arranged in parallel and spaced in sequence along the length direction of the connecting flow channel 8. The connecting flow channel 8 vertically connects the detection flow channels 9 so that the water sample quickly enters the detection flow channels 9. The liquid inlet 10 on the connecting flow channel 8 is located at the bottom of the multi-position flow cell 3, and the liquid outlet 11 is located at the top of the multi-position flow cell 3. The bottom-in and top-out method is adopted. When the liquid is inlet, it helps to discharge the air in the connecting flow channel 8 and the detection flow channel 9, prevent air stagnation, and ensure that the water sample fills each detection flow channel 9.

[0028] The multi-position flow cell 3 is made of glass and is integrated. It not only has a smooth surface and is not easy to adsorb substances, but is also easy to clean and disinfect, which helps to maintain the accuracy and repeatability of the experiment. It can also visualize the inside of the connecting channel 8 and the detection channel 9 to check the liquid inlet process and the cleanliness of the channel.

[0029] The beam splitting optical fiber 4 and the output optical fiber 5 are fixed by an optical fiber fixing seat, and are connected to the light input port 12 and the light output port 13. Among them, the beam splitting optical fiber 4 is a one-to-many optical fiber, which is used to split the light emitted by the light source 2 into N beams and guide them to each light input port 12 respectively. The output optical fiber 5 is set in a one-to-one correspondence with the light output port 13 and the spectrometer 6, and is connected to the light input port 12 and the spectrometer 6. During measurement, the light source 2 emits light of full spectrum wavelengths, and the light beam after being split by the beam splitting optical fiber 4 enters each optical channel 14, is absorbed by the water sample to be measured, and finally the light signal is received by the output optical fiber 5 and transmitted to the corresponding spectrometer 6. Since the light emission is simultaneous, each spectrometer 6 works in a preset order and receives the light signal in turn to distinguish the signal value corresponding to each range.

[0030] In this embodiment, N=3, that is, three detection channels 9 are provided, the beam splitting optical fiber 4 is a one-to-three optical fiber, and the optical channel 14 is correspondingly located between the first light incident port 12a and the first light exit port 13a, between the second light incident port 12b and the second light exit port 13b, and between the third light incident port 12c and the third light exit port 13c. The analyzer uses the absorption characteristics of light of a substance in the ultraviolet region to perform quantitative and qualitative analysis.

[0031] The analyzer needs to be calibrated before measurement. During calibration, pure water is first pumped into the analyzer through the peristaltic pump and the pure water pipe for blank calibration to obtain the calibrated absorbance A of 3 blanks. 01 , A 02 , A 03 Then pump in standard solutions of three concentrations (C1 / C2 / C3) with known conventional measurement parameters for calibration (e.g. the range of ammonia nitrogen determination can be 150mg / L, 50mg / L and 0.5mg / L), and read and record the calibrated absorbance corresponding to different optical channels 14 in turn. The calibrated absorbance corresponding to the C1 standard solution is recorded as A 11 / A 12 / A 13 The corrected absorbance corresponding to the C2 standard solution is recorded as A 21 / A 22 / A 23 The corrected absorbance corresponding to the C3 standard solution is recorded as A 31 / A 32 / A 33 The corrected absorbance must satisfy: A 11 <A 12 <A 13 , A 21 <A 22 <A 23 , A 31 <A 32 <A 33 .

[0032] After calibration, the measurement can be carried out. During the measurement, the sample is pumped in and the sample absorbance is recorded as A. S The sample absorbance obtained in different light channels 14 is A S1 / A S2 / A S3 . Sample absorbance A S There is an optimal range value in the linear range. The absorbance of conventional samples is best within the linear range of 50% to 80%, that is:

[0033]

[0034] The sample absorbance A is obtained by the above formula S1 / A S2 / A S3Compare with the calibration absorbance and select the best sample absorbance A S and the optimal optical path length, and then substitute them into the calculation formula to obtain the sample concentration value.

[0035] In summary, the analyzer covers multiple ranges and can perform measurements in multiple different detection ranges at the same time. There is no need to dilute and switch ranges during measurement. The measurement cycle is short and the efficiency is high. It can also avoid errors caused by inconsistent measurement time, improve the accuracy and reliability of the test results, and reduce the measurement cost.

[0036] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes in form and details of the present invention are within the scope of protection of the present invention without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A multi-range online analyzer, characterized in that: It includes a power adapter, a light source, a multi-position flow cell, a beam splitting optical fiber, N output optical fibers and N spectrometers; the light source and the spectrometer are respectively connected to the power adapter; The multi-position flow cell comprises a flow cell body, a connecting flow channel and a plurality of detection flow channels are provided in the flow cell body, the connecting flow channel is connected to each of the detection flow channels, one end of the connecting flow channel is provided as a liquid inlet, and the other end is provided as a liquid outlet, N pairs of light incident ports and light exit ports are provided outside the detection flow channels, the light incident ports and the light exit ports are used to allow a light beam to enter and exit the detection flow channels, any pair of light incident ports and the light exit ports are provided opposite to each other, and a light channel is formed therebetween, and the length of each of the light channels is different; The beam splitting optical fiber is used to split the light emitted by the light source into N beams and guide them to each light input port respectively; the output optical fiber is arranged corresponding to the light output port and the spectrometer one by one, and connects the light input port and the spectrometer; wherein N is an integer, and N≥2.

2. A multi-range online analyzer as claimed in claim 1, characterized in that: The detection channels are provided with N pieces, and all of them are linear channels. The lengths of the detection channels are different, and they are arranged corresponding to the light incident port and the light exit port one by one. The light incident port and the light exit port are arranged oppositely at the two ends of the detection channel.

3. A multi-range online analyzer as claimed in claim 2, characterized in that: The connecting flow channel is a linear flow channel, and the detection flow channels are arranged in parallel and in sequence along the length direction of the connecting flow channel.

4. A multi-range online analyzer as claimed in claim 2, characterized in that: The multi-position flow cell is an integrated glass component.

5. A multi-range online analyzer as claimed in claim 3, characterized in that: The detection flow channels are provided with three, and the beam splitting optical fiber is a one-to-three optical fiber.

6. A multi-range online analyzer as claimed in claim 1, characterized in that: The liquid inlet is located at the bottom of the multi-position flow cell, and the liquid outlet is located at the top of the multi-position flow cell.

7. A multi-range online analyzer as claimed in claim 1, characterized in that: The light source is a xenon lamp, a mercury lamp or a tungsten lamp, and the power adapter is connected to the light source and the spectrometer via an ultraviolet spectrum connecting line.

8. A multi-range online analyzer as claimed in claim 1, characterized in that: A peristaltic pump and a two-position three-way valve are arranged outside the liquid inlet. The peristaltic pump connects the liquid inlet and a common end of the two-position three-way valve. A pure water pipe and a sample tube are connected to the normally open end and the normally closed end of the two-position three-way valve respectively.

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