A thermostatically controlled dual light path colorimeter

Abstract

The utility model discloses a constant temperature control's double optical path colorimeter, include: light source and reference light path module, including setting up light source subassembly, spectroscope, first temperature detection spare and first photodiode, reference light path passageway and sample light path passageway's first heat conduction spare and first heating piece, and first photodiode sets up in reference light path passageway, colorimeter cell module, detection light path module, including setting up detection light path passageway and second temperature detection spare's second heat conduction spare and second heating piece, and detection light path passageway is provided with second photodiode, temperature control circuit is connected with first, second heating piece and first, second temperature detection spare. Through the device provided by the utility model, through constant temperature control can reduce light intensity fluctuation, wavelength drift, dark current growth and sensitivity drift, improve detection accuracy, through double optical path design synchronous reference signal real -time offset light intensity attenuation or fluctuation of light source subassembly brings the influence, promotes detection stability.

Description

Technical Field

[0001] This utility model relates to the field of water quality analysis instrument technology, and in particular to a constant temperature controlled dual-optical-path colorimetric device. Background Technology

[0002] The colorimetric device of a photoelectric colorimeter is the core component for realizing optical signal detection and concentration analysis. It mainly consists of a monochromatic light source or a light source + monochromator, a cuvette, and a detector. The monochromatic light source or light source + monochromator provides monochromatic light radiation of a specific wavelength, which illuminates the cuvette containing the sample solution. Part of the light is absorbed, and the remaining transmitted light is converted into an electrical signal by the detector. The concentration of the analyte is calculated according to the Lambert-Beer law, thus completing the colorimetric analysis. With the development of semiconductor technology, light-emitting diodes (LEDs) and photodiodes (PDs) have gradually become the mainstream light sources and detectors in photoelectric colorimeters.

[0003] However, the application of LEDs and PDs in existing colorimetric devices has the following problems:

[0004] Environmental factors significantly impact temperature sensitivity: Increased LED junction temperature leads to light intensity decay and peak wavelength drift, compromising light source stability and spectral accuracy. The dark current of the photodiode increases with temperature, superimposing on the signal and causing baseline drift, with the photoresponse potentially drifting synchronously. Furthermore, the coupling effect between LED wavelength drift and PD dark current / sensitivity drift results in an overall system temperature drift far exceeding that of a single device, significantly increasing measurement errors.

[0005] Power-on self-heating causes dynamic drift: Continuous power-on of LEDs leads to a cumulative increase in junction temperature, causing dynamic shifts in light intensity and wavelength. This necessitates long preheating times and performance fluctuates with operating time. Self-heating during PD operation exacerbates dark current noise, creating time-varying interference independent of the environment. These factors pose challenges to applications requiring rapid start-up or long-term continuous monitoring.

[0006] The interplay between ambient temperature changes and the heat generated by the devices themselves results in a complex and time-varying overall temperature field distribution within the system. Traditional static temperature compensation models struggle to accurately capture and compensate for this complex, spatially uneven dynamic thermal effect.

[0007] Although LEDs have a long lifespan, their luminous intensity will decrease and fluctuate over time under the same constant current driving conditions. Existing colorimetric devices generally use a single-beam design, relying on only one beam of light passing through the sample cell. When recording reference information, a reference solution needs to be placed in the sample cell, the LED lit, and a PD signal acquired simultaneously. When recording sample information, the sample cell contains the reacted liquid. In practical use, there is a time difference between recording the reference and recording the sample information. In some projects requiring high-temperature and high-pressure digestion, this time difference can reach 10-30 minutes. When the LED light intensity decreases or fluctuates, the lack of a simultaneous reference signal to offset this fluctuation leads to optical signal deviation, which is ultimately included in the sample detection results, causing detection errors. Utility Model Content

[0008] Therefore, the purpose of this utility model is to at least partially address the shortcomings of the prior art, thereby proposing a constant temperature controlled dual-optical-path colorimetric device.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] This utility model provides a temperature-controlled dual-optical-path colorimetric device, comprising:

[0011] A light source and reference optical path module includes a first heat-conducting component and a first heating component disposed on the first heat-conducting component. The first heat-conducting component contains a light source assembly, a beam splitter, a first temperature detection component, a first photodiode, a reference optical path channel, and a sample optical path channel. The beam splitter splits the light generated by the light source assembly into a reference beam and a sample beam, which pass through the reference optical path channel and the sample optical path channel, respectively. The first photodiode is disposed in the reference optical path channel and receives the reference beam passing through the reference optical path channel.

[0012] A colorimetric cell module, comprising a colorimetric cell irradiated by a sample beam passing through the sample optical path channel;

[0013] The detection optical path module includes a second heat-conducting component and a second heating component disposed on the second heat-conducting component. The second heat-conducting component is provided with a detection optical path channel and a second temperature detection component. The detection optical path channel is provided with a second photodiode so that the sample beam passing through the colorimetric cell enters the detection optical path channel and is received by the second photodiode.

[0014] The temperature control circuit is connected to the first heating element, the second heating element, the first temperature detection element, and the second temperature detection element.

[0015] Furthermore, the light source assembly includes a light source optical path channel that communicates with the reference optical path channel and the sample optical path channel. An LED and a filter are disposed in the light source optical path channel so that the light generated by the LED passes through the filter to form monochromatic light. The first heat-conducting component has multiple first positioning slots that are adapted to the LED, the filter, the beam splitter, the first temperature detection component, and the first photodiode.

[0016] Furthermore, the filter element is disposed between the LED and the beam splitter, and the LED, the filter element, and the beam splitter are concentrically assembled. The distance between the filter element and the beam splitter is 10mm-30mm, and the distance between the filter element and the LED is 5mm-20mm.

[0017] Furthermore, the plane where the beam splitter is located forms a 45° angle with the plane where the filter is located. The beam splitter is disposed at the connection between the light source optical path channel, the reference optical path channel, and the sample optical path channel. The light source optical path channel and the reference optical path channel are arranged perpendicularly and coaxially with the sample optical path channel, so that the monochromatic light generated by the light source optical path channel passes through the sample beam and the reference beam generated by the beam splitter and enters the sample optical path channel and the reference optical path channel, respectively.

[0018] Furthermore, the first photodiode is disposed at the end of the reference optical path channel away from the beam splitter to receive the reference beam reflected into the reference optical path channel, and the center of the first photodiode, the center of the beam splitter, and the center of the filter are on the same horizontal plane, and the distance between the center of the first photodiode and the center of the beam splitter is 10mm-30mm.

[0019] Furthermore, the colorimetric cell module also includes a colorimetric groove, with a mounting groove at the center of the colorimetric groove, and the colorimetric cell is disposed in the mounting groove; a first groove and a second groove are respectively provided on both sides of the colorimetric groove, and a first protrusion and a second protrusion are respectively provided on the side of the light source and reference optical path module and the detection optical path module near the colorimetric groove, and the light source and reference optical path module and the detection optical path module are respectively adapted and connected to the first groove and the second groove on both sides of the colorimetric groove through the first protrusion and the second protrusion, so that the sample beam transmitted into the sample optical path channel passes through the colorimetric cell and enters the detection optical path channel.

[0020] Furthermore, the first protrusion and the second protrusion are respectively provided with a first through hole and a second through hole, and are respectively connected to the sample optical path channel and the detection optical path channel through the first through hole and the second through hole. The first groove and the second groove are also respectively provided with a third through hole and a fourth through hole, and the third through hole and the fourth through hole are respectively connected to the colorimetric cell. The sample optical path channel is connected to the third through hole through the first through hole so that the sample light beam transmitted to the sample optical path channel illuminates the colorimetric cell. The detection optical path channel is connected to the fourth through hole through the second through hole so that the sample light beam passing through the colorimetric cell is received by the second photodiode.

[0021] Furthermore, the detection optical path module also includes a focusing element, which is disposed within the detection optical path channel. The focusing element and the second photodiode are concentrically assembled and respectively disposed at both ends of the detection optical path channel. The distance between the focusing element and the second photodiode is 10mm-30mm. The focusing element is disposed on the side of the detection optical path channel near the colorimetric cell so that the sample beam passing through the colorimetric cell passes through the focusing element within the detection optical path channel and is then received by the second photodiode. The second heat-conducting component has multiple second positioning slots adapted to the focusing element, the second photodiode, and the second temperature detection component.

[0022] Furthermore, the first heating element and the second heating element are respectively provided on one side of the outer surface of the first heat-conducting element and the second heat-conducting element, and the first temperature detection element and the second temperature detection element are respectively provided on the opposite side, at a distance of 3mm-6mm from the edge.

[0023] Furthermore, the outer surfaces of the first heat-conducting component and the second heat-conducting component are respectively covered with a first heat-insulating component and a second heat-insulating component, and the first heat-insulating component and the second heat-insulating component are respectively provided with openings adapted to the sample optical path channel and the detection optical path channel.

[0024] This invention provides a temperature-controlled dual-optical-path colorimetric device, comprising: a light source and a reference optical path module, including a first heat-conducting component and a first heating component disposed on the first heat-conducting component. The first heat-conducting component houses a light source assembly, a beam splitter, a first temperature detection component, a first photodiode, a reference optical path channel, and a sample optical path channel. The beam splitter separates the light generated by the light source assembly into a reference beam and a sample beam, which pass through the reference optical path channel and the sample optical path channel respectively. The first photodiode is disposed within the reference optical path channel and receives light transmitted through the reference optical path. The sample light beam passing through the sample light path channel includes: a reference beam; a colorimetric cell module, including a colorimetric cell irradiated by the sample light beam passing through the sample light path channel; a detection light path module, including a second heat-conducting element and a second heating element disposed on the second heat-conducting element, wherein a detection light path channel and a second temperature detection element are disposed within the second heat-conducting element, and a second photodiode is disposed within the detection light path channel to allow the sample light beam passing through the colorimetric cell to enter the detection light path channel and be received by the second photodiode; and a temperature control circuit connected to the first heating element, the second heating element, the first temperature detection element, and the second temperature detection element. The constant-temperature controlled dual-optical-path colorimetric device provided by this invention allows the temperature control circuit to maintain the constant temperature of the light source, reference optical path module, and detection optical path module. This suppresses temperature changes in the light source components and the first and second photodiodes caused by environmental factors and self-heating during power-on, reducing light intensity fluctuations, wavelength drift, dark current growth, and sensitivity drift. It also reduces system errors caused by temperature drift coupling between the two components, improving detection accuracy. Furthermore, the dual-optical-path design in the light source and reference optical path modules allows the synchronous reference signal to offset the effects of light intensity attenuation or fluctuations in the light source components in real time, preventing light signal deviations from being included in the sample detection results and improving detection stability. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the constant temperature controlled dual-optical-path colorimetric device of this utility model.

[0027] Figure 2 This is a cross-sectional view of the first heat-conducting component of the constant temperature controlled dual-optical-path colorimetric device of this utility model.

[0028] Figure 3 This is a schematic diagram of the external structure of the first heat-conducting component of the constant temperature controlled dual-optical-path colorimetric device of this utility model.

[0029] Figure 4 This is a cross-sectional view of the light source and reference optical path module of the constant temperature controlled dual-optical-path colorimetric device of this utility model.

[0030] Figure 5 This is a schematic diagram of the external structure of the light source and reference optical path module of the constant temperature controlled dual optical path colorimetric device of this utility model.

[0031] Figure 6 This is a cross-sectional view of the second heat-conducting component of the constant temperature controlled dual-optical-path colorimetric device of this utility model.

[0032] Figure 7 This is a schematic diagram of the external structure of the second heat-conducting component of the constant temperature controlled dual-optical-path colorimetric device of this utility model.

[0033] Figure 8 This is a cross-sectional view of the detection optical path module of the constant temperature controlled dual-optical-path colorimetric device of this utility model;

[0034] Figure 9 This is a schematic diagram of the external structure of the detection optical path module of the constant temperature controlled dual-optical-path colorimetric device of this utility model.

[0035] Figure 10 For the present utility model Figure 1 An enlarged schematic diagram of structure A in the diagram.

[0036] The reference numerals in the figure are as follows: 1. Light source and reference optical path module; 11. First heat-conducting component; 111. Spectrometer; 112. First temperature detection component; 113. First photodiode; 114. Reference optical path channel; 115. Sample optical path channel; 12. First heating component; 13. First protrusion; 131. First through hole; 2. Colorimetric cell module; 21. Colorimetric cell; 22. Colorimetric groove; 221. First groove; 2211. Third through hole; 222, Second groove; 2221, Fourth through hole; 3, Detection optical path module; 31, Second heat-conducting component; 32, Second heating component; 33, Detection optical path channel; 331, Second photodiode; 332, Focusing component; 34, Second temperature detection component; 35, Second protrusion; 351, Second through hole; 4, Light source assembly; 41, Light source optical path channel; 411, LED; 412, Filter component; 5, First heat insulation component; 6, Second heat insulation component. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] It should be noted that the descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0039] Please refer to Figures 1 to 10 This utility model provides a temperature-controlled dual-optical-path colorimetric device, comprising:

[0040] The light source and reference optical path module 1 includes a first heat-conducting component 11 and a first heating component 12 disposed on the first heat-conducting component 11. The first heat-conducting component 11 is provided with a light source assembly 4, a beam splitter 111, a first temperature detection component 112, a first photodiode 113, a reference optical path channel 114, and a sample optical path channel 115. The beam splitter 111 splits the light generated by the light source assembly 4 into a reference beam and a sample beam, which pass through the reference optical path channel 114 and the sample optical path channel 115 respectively. The first photodiode 113 is disposed in the reference optical path channel 114 and receives the reference beam passing through the reference optical path channel 114.

[0041] The colorimetric cell module 2 includes a colorimetric cell 21 that is illuminated by a sample beam passing through the sample optical path channel 115;

[0042] The detection optical path module 3 includes a second heat-conducting element 31 and a second heating element 32 disposed on the second heat-conducting element 31. The second heat-conducting element 31 is provided with a detection optical path channel 33 and a second temperature detection element 34. The detection optical path channel 33 is provided with a second photodiode 331 so that the sample beam passing through the colorimetric cell 21 enters the detection optical path channel 33 and is received by the second photodiode 331.

[0043] The temperature control circuit is connected to the first heating element 12, the second heating element 32, the first temperature detection element 112, and the second temperature detection element 34.

[0044] In this embodiment, the temperature-controlled dual-optical-path colorimetric device includes a light source and reference optical path module 1, a cuvette module 2, a detection optical path module 3, and a temperature control circuit. Specifically, the light source and reference optical path module 1 is provided with a light source assembly 4, a reference optical path channel 114, a sample optical path channel 115, and a beam splitter 111. The light generated by the light source assembly 4 is reflected and transmitted by the beam splitter 111, splitting it into a sample beam and a reference beam. The sample beam is axially transmitted into the sample optical path channel 115 and illuminates the cuvette 21 in the cuvette module 2. In this embodiment, the beam splitter 111 is specifically a beam splitter, and the specific type of the beam splitter 111 is not limited here. The reference beam is vertically reflected into the reference optical path channel 114, where a first photodiode (PD) 113 is provided. The first photodiode 113 receives the reference beam reflected into the reference optical path channel 114. Because existing colorimetric devices generally use a single-path design, relying on only one beam of light passing through the sample cell, when it is necessary to record reference information, a reference solution needs to be placed in the sample cell, the light source needs to be lit, and the reference signal needs to be acquired simultaneously. When it is necessary to record sample information, the sample cell contains the liquid after the reaction. In actual use, there is a time difference between recording the reference and recording the sample information. In some projects that require high temperature and high pressure digestion, this time difference can reach 10-30 minutes. Moreover, when the light intensity of the light source decays or fluctuates, there is no reference signal at the same time to eliminate this fluctuation, which will lead to optical signal deviation, and ultimately be included in the sample detection result, resulting in detection deviation. In this embodiment, the light source and reference optical path module 1 is provided with a reference optical path channel 114 and a sample optical path channel 115, forming a dual optical path. The light generated by the light source component 4 is synchronously split into a sample beam and a reference beam. The sample beam illuminates the sample in the colorimetric cell module 2 through the sample optical path channel 115, while the reference beam illuminates the first photodiode 113 through the reference optical path channel and is converted into a reference signal. This solves the problem of not being able to synchronize the reference signal to eliminate light source fluctuations.

[0045] In this embodiment, the detection optical path module 3 is provided with a detection optical path channel 33, and a second photodiode 331 is provided in the detection optical path channel 33. When the sample beam passes through the sample optical path 115 to illuminate the colorimetric cell 21 and passes through the colorimetric cell 21 to illuminate the detection optical path channel 33, it is received by the second photodiode 331. The second photodiode 331 converts the received sample beam into a sample signal.

[0046] In this embodiment, a first heating element 12 is provided on the first heat-conducting element 11. The first heating element 12 is used to heat the first heat-conducting element 11, and the first heat-conducting element 11 is used to transfer heat to the light source assembly 4, the beam splitter 111, and the first photodiode 113 disposed therein. A second heating element 32 is also provided on the second heat-conducting element 31. The second heating element 32 is used to heat the second heat-conducting element 31, and the second heat-conducting element 31 is used to transfer heat to the second photodiode 331 disposed therein. Both the first heat-conducting element 11 and the second heat-conducting element 31 are sealed cavities made of a high thermal conductivity material, specifically aluminum. The specific materials of the first heat-conducting element 11 and the second heat-conducting element 31 are not limited here and are determined according to actual production needs. Furthermore, the first heat-conducting element 11 can be designed as an integral or separate structure depending on the shape and assembly requirements of other devices; this is not limited here.

[0047] The first heat-conducting element 11 and the second heat-conducting element 31 are respectively provided with a first temperature detection element 112 and a second temperature detection element 34, which are used to detect the specific temperatures of the first heat-conducting element 11 and the second heat-conducting element 31. Both the first temperature detection element 112 and the second temperature detection element 34 are temperature sensors, and the temperature sensors are common models available on the market, which are not limited here.

[0048] In this embodiment, the temperature control circuit is connected to the first heating element 12, the second heating element 32, and the first temperature detection element 112 and the second temperature detection element 34 via shielded signal lines. The temperature control circuit receives real-time temperature readings from the first temperature detection element 112 and the second temperature detection element 34 (reflecting the current temperatures of the first heat-conducting element 11 and the second heat-conducting element 31, respectively), and controls the first heating element 12 and the second heating element 32 to heat the first heat-conducting element 11 and the second heat-conducting element 31 respectively, based on a preset target temperature. This allows for constant temperature control of the light source and reference optical path module 1 and the detection optical path module 2, enabling separate temperature control of the light source and reference optical path module 1 and the detection optical path module 3, while maintaining synchronized temperatures. Furthermore, the temperature control circuit employs a PID algorithm; when the monitored values ​​of the first temperature detection element 112 and the second temperature detection element 34 deviate from the set value by ±0.5℃, the power of the first heating element 12 and the second heating element 32 is dynamically adjusted, allowing the target temperature to be reached within 2-5 minutes. The temperature control circuit stabilizes the operating temperatures of the light source assembly 4, the beam splitter 111, and the first photodiode 113 at target values, suppressing light intensity and wavelength drift caused by junction temperature changes in the light source assembly 4, while also reducing dark current and sensitivity drift in the first photodiode 113. Similarly, the temperature control circuit stabilizes the temperature of the second photodiode 331 at target values, preventing dark current fluctuations caused by temperature fluctuations in the second photodiode 331. In other words, by maintaining a constant temperature, it suppresses temperature changes in the light source assembly, the first photodiode 113, and the second photodiode 331 caused by environmental factors and self-heating during operation, reducing light intensity attenuation, wavelength drift, dark current increase, and sensitivity drift, thus reducing system errors caused by temperature drift coupling and improving detection accuracy.

[0049] The specific preset temperature setting strategy is as follows: the constant temperature target value is set to "device self-heating equilibrium temperature +5~10℃" (e.g., 55-65℃), which suppresses temperature drift and avoids overheating and aging.

[0050] Given that the ambient temperature for the colorimeter is 5-45℃, and based on the equilibrium temperature (generally below 50℃) of the self-heating of the light source component 4, the first photodiode 113, and the second photodiode 331, the temperature of the first heat-conducting component 11 is kept constant at a temperature point 5-10℃ higher than the equilibrium temperature, i.e., 55-65℃. This avoids the constant temperature point being too low (e.g., below the self-heating equilibrium temperature of the light source component 4, the first photodiode 113, and the second photodiode 331) leading to ineffective temperature control, and also avoids the constant temperature point being too high, which would shorten the lifespan of the light source component 4, the first photodiode 113, and the second photodiode 331.

[0051] Furthermore, the light source assembly 4 includes a light source optical path channel 41 that is connected to the reference optical path channel 114 and the sample optical path channel 115. An LED 411 and a filter 412 are disposed in the light source optical path channel 41 so that the light generated by the LED 411 is filtered by the filter 412 to form monochromatic light. The first heat-conducting component 11 has a plurality of first positioning grooves adapted to the LED 411, the filter 412, the beam splitter 111, the first temperature detection component 112, and the first photodiode 113.

[0052] In this embodiment, the light source assembly 4 includes a light source optical path channel 41, within which an LED 411 and a filter 412 are disposed. Specifically, the filter 412 is a light filter in this embodiment. The light source optical path channel 41 is interconnected with the reference optical path channel 114 and the sample optical path channel 115, allowing the light generated by the LED 411 in the light source optical path channel 41 to emit monochromatic light of a specific wavelength through the filter 412, thereby ensuring the spectral purity of the incident light. The monochromatic light is simultaneously split into a reference beam and a sample beam by the beam splitter 111. The reference beam enters the reference optical path channel 114, while the sample beam enters the sample optical path channel 115 and is used to illuminate the colorimetric cell 21.

[0053] In this embodiment, the first heat-conducting component 11 has multiple precision first positioning slots inside. These slots are used to assemble the LED 411, the filter 412, the beam splitter 111, the first temperature sensing component 112, and the first photodiode 113, respectively. The dimensions of the multiple positioning slots are adapted to the external dimensions of the aforementioned devices to ensure stable assembly. The light-emitting surfaces or photosensitive areas of the LED 411, the filter 412, the beam splitter 111, and the first photodiode 113 are all located in the central hollow area of ​​their respective first positioning slots, without obstruction. The interior of the first heat-conducting component 11 only contacts the non-optical areas of the aforementioned devices through the edges of the slot walls, such as the frame of the filter 412, the frame structure of the beam splitter 111, and the outer metal shell of the first photodiode 113. Specifically, the LED 411 is circumferentially enclosed within the corresponding first positioning slot of the first heat-conducting component 11, with only the light-emitting surface of the LED 411 exposed. The light-emitting surface of the LED 411 faces the light path channel of the light source without obstruction. The edge of the filter 412 is engaged in the corresponding first positioning groove, leaving its central light-transmitting area suspended, with its light-transmitting surface fully exposed to the axis of the light path channel of the light source. The frame of the beam splitter 111 is engaged in the corresponding first positioning groove, with its entire reflective / projection surface not in contact with the first heat-conducting component. The outer shell sidewall of the first photodiode 113 is fixed to the corresponding first positioning groove, and its photosensitive surface is suspended, with the photosensitive chip on the photosensitive surface facing the reference beam reflected from the beam splitter 11. The first temperature sensing component 112 is embedded in the corresponding first positioning groove.

[0054] Furthermore, the filter element 412 is disposed between the LED 411 and the beam splitter 111, and the LED 411, the filter element 412 and the beam splitter 111 are concentrically assembled. The distance between the filter element 412 and the beam splitter 111 is 10mm-30mm, and the distance between the filter element 412 and the LED 411 is 5mm-20mm.

[0055] In this embodiment, the filter 412, LED 411, and beam splitter 111 are concentrically assembled. The filter 412 is mounted 5mm-20mm away from the LED 411 on the side facing the beam splitter 111, and the beam splitter 111 is disposed 10mm-30mm away from the LED 411 on the side of the filter 412. In this embodiment, the LED 411 and the beam splitter 111 are respectively disposed 15mm apart on both sides of the filter 412, so that the light emitted by the LED 411 passes through the filter 412 to form monochromatic light. The monochromatic light is split by the beam splitter 111, and the reference beam and sample beam are simultaneously reflected and transmitted into the reference optical path channel 114 and the sample optical path channel 115, respectively.

[0056] Furthermore, the plane where the beam splitter 111 is located forms a 45° angle with the plane where the filter 412 is located. The beam splitter 111 is disposed at the connection between the light source optical path channel 41, the reference optical path channel 114, and the sample optical path channel 115. The light source optical path channel 41 and the reference optical path channel 114 are arranged perpendicularly, and the light source optical path channel 41 and the sample optical path channel 115 are arranged coaxially and in the same direction, so that the monochromatic light generated by the light source optical path channel 41 passes through the sample beam and the reference beam generated by the beam splitter 111 and enters the sample optical path channel 115 and the reference optical path channel 114 respectively.

[0057] In this embodiment, the specific specifications of the beam splitter 111 are T50:R50, where T (Transmittance) represents transmittance and R (Reflectance) represents reflectance. That is, the transmittance and reflectance of the beam splitter 111 are both 50%, ensuring that the monochromatic light generated by the light source assembly 4 is reflected and transmitted through the beam splitter 111 and proportionally divided into a reference beam and a sample beam, thereby improving measurement accuracy. Specifically, the specifications of the beam splitter 111 are influenced by its distance from the first photodiode 113 and the second photodiode 331. When the sample in the cuvette 21 is a zero-concentration sample, the specifications of the beam splitter 111 should ensure that the light intensities of the separated reference beam and sample beam reaching the first photodiode 113 and the second photodiode 331 are equal, respectively. Because the intensity of light decreases with increasing distance, in some cases, the difference between the distance from the beam splitter 111 to the first photodiode 113 and the distance from the beam splitter 111 to the second photodiode 331 is insufficient to ensure that the intensity of the reference beam and the sample beam split by the beam splitter 111 (with a transmittance and reflectance ratio of 50:50) reaching the first photodiode 113 and the second photodiode 331 is consistent. Therefore, the ratio of transmittance and reflectance of the beam splitter 111 needs to be adjusted to compensate for the intensity deviation caused by the distance difference. Therefore, beam splitters 111 of other specifications can also be used, such as T60:R40, T70:R30, etc. The specific specifications of the beam splitter 111 are not limited here and are set according to actual production needs.

[0058] The beam splitter 111 is disposed at the connection between the light source optical path channel 41, the reference optical path channel 114, and the sample optical path channel 115. The light source optical path channel 41 and the reference optical path channel 114 are arranged perpendicularly, and the light source optical path channel 41 and the sample optical path channel 115 are arranged coaxially. The plane where the beam splitter 111 is located forms an angle of 45° with the plane where the filter 412 is located. This allows the reference beam reflected by the monochromatic light by the beam splitter 111 to enter the reference optical path channel 114 perpendicularly, while the sample beam transmitted by the monochromatic light by the beam splitter 111 directly enters the sample optical path channel 115.

[0059] Furthermore, the first photodiode 113 is disposed at the end of the reference optical path channel 114 away from the beam splitter 111 to receive the reference beam reflected into the reference optical path channel 114, and the center of the first photodiode 113, the center of the beam splitter 111, and the center of the filter 412 are on the same horizontal plane, and the distance between the center of the first photodiode 113 and the center of the beam splitter 111 is 10mm-30mm.

[0060] In this embodiment, a beam splitter 111 is provided at one end of the reference optical path channel 114, and a first photodiode 113 is provided at the other end, so that the reference beam reflected by the beam splitter 111 into the reference optical path channel 114 can be received by the first photodiode 113. The first photodiode 113 serves as a photoelectric detection sensor for the reference optical path channel 114. Its function is to eliminate system errors by monitoring the state of the original light source in real time. For example, when the brightness of LED 411 changes due to temperature drift or aging, the first photodiode 113 and the second photodiode 331 simultaneously sense the change and automatically cancel out the influence in the calculation, ensuring reliable detection results.

[0061] The center of the first photodiode 113, the center of the beam splitter 111, and the center of the filter 412 are located on the same horizontal plane. This allows the first photodiode 113 to better receive the reference beam reflected by the beam splitter 111. The distance between the center of the first photodiode 113 and the center of the beam splitter 111 is 10mm-30mm. In this embodiment, the specific distance is 20mm. When the distance is within the range of 10mm-30mm, the first photodiode 113 can obtain sufficient light energy without adding a condenser lens. If the distance is less than 10mm, interference will occur during assembly. If the distance is greater than 30mm, a condenser lens is required to reliably meet the light energy requirements for detection.

[0062] Furthermore, the colorimetric cell module 2 also includes a colorimetric cell 22, with an installation groove at the center of the colorimetric cell 22, and the colorimetric cell 21 is disposed in the installation groove. A first groove 221 and a second groove 222 are respectively provided on both sides of the colorimetric cell 22. A first protrusion 13 and a second protrusion 35 are respectively provided on the side of the light source and reference optical path module 1 and the detection optical path module 3 near the colorimetric cell 22. The light source and reference optical path module 1 and the detection optical path module 3 are respectively adapted and connected to the first groove 221 and the second groove 222 on both sides of the colorimetric cell 22 through the first protrusion 13 and the second protrusion 35, so that the sample beam transmitted into the sample optical path channel 115 passes through the colorimetric cell 21 and enters the detection optical path channel 33.

[0063] In this embodiment, the colorimetric cell module 2 also includes a colorimetric tank 22. A mounting slot is provided at the center of the colorimetric tank 22, and the colorimetric cell 21 is installed in the mounting slot. When the temperature-controlled dual-light path colorimetric device is used in a portable colorimeter, the upper end of the mounting slot is open and the lower end is closed. The colorimetric cell 21 is a colorimetric container with one open end and a lid, such as a cuvette, cuvette bottle, or cuvette tube. When in use, the colorimetric cell 21 containing the sample is inserted into the mounting slot. When the temperature-controlled dual-light path colorimetric device is used in an online colorimetric instrument, both the upper and lower ends of the mounting slot are open. The colorimetric cell 21 is also a container with both ends open. The lower opening is connected to the sample inflow tube, and the upper opening is connected to the sample outflow tube.

[0064] The colorimetric cell 22 has a first groove 221 and a second groove 222 on its two opposite sides, which are used to assemble the light source and reference optical path module 1 and the detection optical path module 3, respectively. The light source and reference optical path module 1 is provided with a first protrusion 13 on the side near the first groove 221, and is assembled adjacent to the first groove 221 on one side of the colorimetric cell 22 through the first protrusion 13, and can be further fixed by screws or the like. The detection optical path module 3 is provided with a second protrusion 35 on the side near the second groove 222, and is assembled adjacent to the second groove 222 on the other side of the colorimetric cell 22 through the second protrusion 35, and can be further fixed by screws or the like. Through the coordinated assembly of the first groove 221 and the second groove 222 on both sides of the colorimetric cell 22, as well as the first protrusion 13 and the second protrusion 35 of the light source and reference optical path module 1 and the detection module 3, the sample beam transmitted by the monochromatic light in the light source and reference optical path module 1 through the beam splitter 111 can enter the sample optical path channel 115 and pass through the center intersection of the horizontal and vertical planes of the colorimetric cell 21. After passing through the colorimetric cell 21, it enters the detection optical path channel 33 in the detection optical path module 3 and is received and converted into a sample signal by the second photodiode 331.

[0065] Furthermore, the first protrusion 13 and the second protrusion 35 are respectively provided with a first through hole 131 and a second through hole 351, and are respectively connected to the sample optical path channel 115 and the detection optical path channel 33 through the first through hole 131 and the second through hole 351. The first groove 221 and the second groove 222 are also respectively provided with a third through hole 2211 and a fourth through hole 2221, and are respectively connected to the colorimetric cell 21. The sample optical path channel 115 is connected to the third through hole 2211 through the first through hole 131 so that the sample light beam transmitted to the sample optical path channel 115 illuminates the colorimetric cell 21. The detection optical path channel 33 is connected to the fourth through hole 2221 through the second through hole 351 so that the sample light beam passing through the colorimetric cell 21 is received by the second photodiode 331.

[0066] In this embodiment, the first protrusion 13 of the light source and reference optical path module 1 has a first through hole 131, which is connected to the sample optical path channel 115. The first groove 221 on one side of the colorimetric cell 22 also has a third through hole 2211, which is connected to the colorimetric cell 21 in the mounting groove. Since the light source and reference optical path module 1 is adapted and snapped together by the first protrusion 13 and the first groove 221 on the side of the colorimetric cell 22, the first through hole 131 on the first protrusion 13 is also connected to the third through hole 2211 of the first groove 221. Thus, the sample beam can be sequentially injected into the sample optical path channel 115, the first through hole 131, and the third through hole 2211, and then pass through the colorimetric cell 21.

[0067] The second groove 222 on the other side of the colorimetric cell 22 is also provided with a fourth through hole 2221. The fourth through hole 2221 is also connected to the colorimetric cell 21 in the mounting groove. The second protrusion 35 of the detection optical path channel 33 is provided with a second through hole 351. The second through hole 351 is connected to the detection optical path channel 33. Since the detection optical path channel 33 is adapted and engaged with the second groove 222 on the other side of the colorimetric cell 22 through the second protrusion 35, the second through hole 351 on the second protrusion 35 is also connected to the fourth through hole 2221 of the second groove 222. Thus, the sample beam passing through the colorimetric cell 21 can pass through the fourth through hole 2221 and the second through hole 351 in sequence, and then enter the detection optical path channel 33, and be received by the second photodiode 331.

[0068] Furthermore, the detection optical path module 3 also includes a focusing element 332, which is disposed within the detection optical path channel 33. The focusing element 332 and the second photodiode 331 are concentrically assembled and respectively disposed at both ends of the detection optical path channel 33. The distance between the focusing element 332 and the second photodiode 331 is 10mm-30mm. The focusing element 332 is disposed on the side of the detection optical path channel 33 near the colorimetric cell 21 so that the sample beam passing through the colorimetric cell 21 passes through the focusing element 332 in the detection optical path channel 33 and is then received by the second photodiode 331. The second heat-conducting element 31 has multiple second positioning grooves adapted to the focusing element 332, the second photodiode 331, and the second temperature detection element 34.

[0069] In this embodiment, the detection optical path module 3 further includes a focusing element 332 for reducing light divergence loss. Specifically, the focusing element 332 is a focusing lens in this embodiment, and the specific material of the focusing element 332 is not limited. The focusing element 332 is disposed within the detection optical path channel 33, and is concentrically assembled with the second photodiode 331, respectively disposed at both ends of the detection optical path channel 33. The focusing element 332 is disposed at the end of the detection optical path channel 33 closest to the colorimetric cell 21. That is, when the sample beam passing through the colorimetric cell 21 passes through the detection optical path channel 33, it first passes through the focusing element 332 and is then received by the second photodiode 331.

[0070] The distance between the focusing element 332 and the second photodiode 331 is 10mm-30mm, specifically 20mm in this embodiment. The exact distance between them is not limited and can be set according to actual production needs. Maintaining the distance between them within the range of 10mm-30mm ensures that the sample beam passing through the colorimetric cell 21, after passing through the focusing element 332, can be precisely focused on the photosensitive area of ​​the second photodiode 331, while avoiding the risk of mechanical interference.

[0071] In this embodiment, the second heat-conducting component 31 is provided with a plurality of precision second positioning grooves. The plurality of second positioning grooves are used to assemble the focusing component 332, the second photodiode 331, and the second temperature sensing component 34. The dimensions of the plurality of second positioning grooves are respectively adapted to the external dimensions of the above-mentioned components to ensure the stable assembly of the components.

[0072] Furthermore, a first heating element 12 and a second heating element 32 are respectively provided on one side of the outer surface of the first heat-conducting element 11 and the second heat-conducting element 31, and a first temperature detection element 112 and a second temperature detection element 34 are respectively provided on the opposite side, at a distance of 3mm-6mm from the edge.

[0073] In this embodiment, the first heating element 12 and the second heating element 32 are respectively disposed on the first heat-conducting element 11 and the second heat-conducting element 31, and the assembly method of the two is the same. Taking the first heating element 12 disposed on the first heat-conducting element 11 as an example:

[0074] When the first heating element 12 is a thin film heating sheet, it is directly attached to the outer surface of the first heat-conducting element 11;

[0075] When the first heating element 12 is a ceramic heating plate, a slot adapted to the shape of the ceramic heating plate is opened on the first heat-conducting element 11, and then the ceramic heating plate is assembled on the first heat-conducting element 11.

[0076] In this embodiment, the first heat-conducting element 11 and the second heat-conducting element 31 each include two opposing outer surfaces. A heating element is disposed on one of the outer surfaces, and a first temperature detection element 112 and a second temperature detection element 34 are disposed on the other opposing outer surface. The first temperature detection element 112 and the second temperature detection element 34 are respectively disposed at a distance of 3-6 mm from the edges of the first heat-conducting element 11 and the second heat-conducting element 31, and are used to monitor whether the temperature environment formed by the first heat-conducting element 11 and the second heat-conducting element 31 meets the set temperature. This not only monitors the temperature of the actual device, but also avoids assembly interference with other components. Specifically, the first temperature detection element 112 and the second temperature detection element 34 are respectively disposed at a distance of 5 mm from the edges of the first heat-conducting element 11 and the second heat-conducting element 31. The specific distance is not limited here and is set according to actual production needs.

[0077] Furthermore, the outer surfaces of the first heat-conducting component 11 and the second heat-conducting component 31 are respectively covered with the first heat-insulating component 5 and the second heat-insulating component 6, and the first heat-insulating component 5 and the second heat-insulating component 6 are respectively provided with openings for the sample optical path channel 115 and the detection optical path channel 33.

[0078] In this embodiment, the outer surfaces of the first heat-conducting element 11 and the second heat-conducting element 31 are respectively wrapped with the first heat-insulating element 5 and the second heat-insulating element 6. The first heat-insulating element 5 and the second heat-insulating element 6 completely wrap the outer surfaces (including the sides and non-optical path penetration surfaces) of the first heat-conducting element 11 and the second heat-conducting element 31, leaving only openings for the sample optical path channel 115, the detection optical path channel 33, and the circuit channel to isolate the light source, the reference optical path module 1, and the detection optical path module 3 from other structures of the colorimeter (e.g., the battery compartment and other components of a portable colorimeter). The first heat-insulating element 5 and the second heat-insulating element 6 respectively block the interference of the external ambient temperature on the optical path areas within the light source, the reference optical path module 1, and the detection optical path module 3, reducing the mutual interference between the external environment and the constant temperature field of the first heat-conducting element 11 and the second heat-conducting element 31, and achieving long-term stability of the device's operating state. Furthermore, by covering the non-road surface of the first heat-conducting element 11 and the second heat-conducting element 31 with the first heat-insulating element 5 and the second heat-insulating element 6 respectively, a three-layer gradient heat insulation structure of "constant temperature core layer - heat insulation intermediate layer - external environment" is formed. Among them, the first heat-insulating element 5 and the second heat-insulating element 6 are made of low thermal conductivity materials, such as polyurethane foam, aerogel materials, etc.

[0079] In summary, the temperature-controlled dual-optical-path colorimetric device in this application embodiment achieves high-precision and high-stability colorimetric analysis through the synergistic effect of temperature control and synchronous dual-optical-path detection. The specific workflow is as follows:

[0080] 1. Constant temperature control start-up and stabilization

[0081] After the device is started, the temperature control circuit receives real-time monitoring signals from the first temperature sensor 112 and the second temperature sensor 34, and controls the first heating element 12 and the second heating element 32 to heat the first heat-conducting element 11 and the second heat-conducting element 31 respectively according to the preset target temperature (55-65℃ in this embodiment). The temperature control circuit also uses a PID algorithm to dynamically adjust the power of the first heating element 12 and the second heating element 32 when the monitored values ​​of the first temperature sensor 112 and the second temperature sensor 34 deviate from the target value by ±0.5℃, so that the target temperature can be reached within 2-5 minutes.

[0082] The first heat-conducting component 11 transfers heat to the LED 411, the filter 412, the beam splitter 111 and the first photodiode 113 through thermal conduction, so that its operating temperature is stabilized at the target value, suppressing the light intensity wavelength and wavelength drift of the LED 411 caused by junction temperature changes, and at the same time reducing the dark current and sensitivity drift of the first photodiode 113.

[0083] The second heat-conducting element 31 simultaneously stabilizes the temperature of the focusing element 332 and the second photodiode 331 at the same target value, avoiding the dark current generated by the second photodiode 331 due to temperature fluctuations and the deviation in light response in the morning.

[0084] The first heat insulation element 5 and the second heat insulation element 6 block the influence of external ambient temperature on the optical path area, reduce the mutual interference between the external environment and the constant temperature field of the first heat-conducting element 11 and the second heat-conducting element 31, and achieve long-term stability of the device's working state.

[0085] 2. Synchronous generation and transmission of dual-optical-path signals

[0086] Light source and generation of monochromatic light: The composite light emitted by LED411 is filtered by the filter 412 located 5-20mm in front to form monochromatic light of a specific wavelength, ensuring the spectral purity of the incident light;

[0087] Beam splitting and path separation: When monochromatic light propagates to a distance of 10-30mm, a beam splitter 111 set at a 45° angle is split into a reference beam and a sample beam by proportional reflection and transmission.

[0088] The reference beam reflected by the beam splitter 111 propagates perpendicularly to the light source optical path channel 41, enters the reference optical path channel 114, and is received by the first photodiode 113 located 10-30 mm away from the beam splitter 111 in the reference optical path channel 114, and is converted into a reference signal (real-time reference signal) reflecting the current light source intensity.

[0089] The sample beam transmitted by the beam splitter 111 continues to propagate along the sample optical path channel 115, which is coaxial and in the same direction as the light source optical path channel 41. It passes through the center of the colorimetric cell 21 in the colorimetric cell module 2 (where the sample solution in the colorimetric cell 21 absorbs some light energy), and then passes through the focusing element 332 of the detection optical path channel 33 in the detection optical path module 3. Finally, it is received by the second photodiode 331, which is spaced 10-30 mm away from the focusing element 332, and converted into a sample electrical signal carrying the sample concentration.

[0090] 3. Signal processing and concentration calculation

[0091] The sample signal converted by the second photodiode 331 and the reference signal converted by the first photodiode 113 are synchronously transmitted to the signal processing unit to achieve error cancellation and concentration analysis.

[0092] Using the reference signal as a benchmark, the sample signal is normalized (sample signal ÷ reference signal) to eliminate light source fluctuations. This ratio is the transmittance T in the Lambert-Beer law.

[0093] Based on the light emitted by the stable light source component 4 under constant temperature control and the performance of the detection device, combined with the Lambert-Beer law (absorbance A = lg(Io / I) = lg(1 / T), where Io is the light intensity corresponding to the reference signal and I is the light intensity corresponding to the sample signal), the absorbance of the sample is calculated.

[0094] Finally, the precise concentration value of the analyte is output through the calibration curve of absorbance versus concentration.

[0095] Through the above process, the device not only suppresses the temperature drift interference of the light source component 4, the first photodiode 113, and the second photodiode 331 from the source by constant temperature control, but also eliminates the influence of light source fluctuation by using dual optical path synchronous reference, thus achieving high-precision detection in scenarios of rapid start-up and long-term continuous monitoring.

[0096] The temperature-controlled dual-optical-path colorimetric device is used in the colorimeter. That is, the temperature-controlled dual-optical-path colorimetric device in this embodiment is a part of the structure of the colorimeter. The temperature control circuit is specifically set on the main control board inside the colorimeter, and the signal processing unit is also set on the main control board inside the colorimeter.

[0097] This invention provides a temperature-controlled dual-optical-path colorimetric device, comprising: a light source and a reference optical path module, including a first heat-conducting component and a first heating component disposed on the first heat-conducting component. The first heat-conducting component houses a light source assembly, a beam splitter, a first temperature detection component, a first photodiode, a reference optical path channel, and a sample optical path channel. The beam splitter separates the light generated by the light source assembly into a reference beam and a sample beam, which pass through the reference optical path channel and the sample optical path channel respectively. The first photodiode is disposed within the reference optical path channel and receives light transmitted through the reference optical path. The sample light beam passing through the sample light path channel includes: a reference beam; a colorimetric cell module, including a colorimetric cell irradiated by the sample light beam passing through the sample light path channel; a detection light path module, including a second heat-conducting element and a second heating element disposed on the second heat-conducting element, wherein a detection light path channel and a second temperature detection element are disposed within the second heat-conducting element, and a second photodiode is disposed within the detection light path channel to allow the sample light beam passing through the colorimetric cell to enter the detection light path channel and be received by the second photodiode; and a temperature control circuit connected to the first heating element, the second heating element, the first temperature detection element, and the second temperature detection element. The constant-temperature controlled dual-optical-path colorimetric device provided by this invention allows the temperature control circuit to maintain the constant temperature of the light source, reference optical path module, and detection optical path module. This suppresses temperature changes in the light source components and the first and second photodiodes caused by environmental factors and self-heating during power-on, reducing light intensity fluctuations, wavelength drift, dark current growth, and sensitivity drift. It also reduces system errors caused by temperature drift coupling between the two components, improving detection accuracy. Furthermore, the dual-optical-path design in the light source and reference optical path modules allows the synchronous reference signal to offset the effects of light intensity attenuation or fluctuations in the light source components in real time, preventing light signal deviations from being included in the sample detection results and improving detection stability.

[0098] It should be noted that the various embodiments in this utility model are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0099] It should also be noted that, in the present invention, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0100] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined in the present invention may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A temperature-controlled dual-optical-path colorimetric device, characterized in that, include: A light source and reference optical path module includes a first heat-conducting component and a first heating component disposed on the first heat-conducting component. The first heat-conducting component contains a light source assembly, a beam splitter, a first temperature detection component, a first photodiode, a reference optical path channel, and a sample optical path channel. The beam splitter splits the light generated by the light source assembly into a reference beam and a sample beam, which pass through the reference optical path channel and the sample optical path channel, respectively. The first photodiode is disposed in the reference optical path channel and receives the reference beam passing through the reference optical path channel. A colorimetric cell module, comprising a colorimetric cell irradiated by a sample beam passing through the sample optical path channel; The detection optical path module includes a second heat-conducting component and a second heating component disposed on the second heat-conducting component. The second heat-conducting component is provided with a detection optical path channel and a second temperature detection component. The detection optical path channel is provided with a second photodiode so that the sample beam passing through the colorimetric cell enters the detection optical path channel and is received by the second photodiode. The temperature control circuit is connected to the first heating element, the second heating element, the first temperature detection element, and the second temperature detection element.

2. The temperature-controlled dual-optical-path colorimetric device according to claim 1, characterized in that, The light source assembly includes a light source optical path channel that communicates with the reference optical path channel and the sample optical path channel. An LED and a filter are disposed in the light source optical path channel so that the light generated by the LED passes through the filter to form monochromatic light. The first heat-conducting component has multiple first positioning slots that are adapted to the LED, the filter, the beam splitter, the first temperature detection component, and the first photodiode.

3. The temperature-controlled dual-optical-path colorimetric device according to claim 2, characterized in that, The filter element is disposed between the LED and the beam splitter, and the LED, the filter element and the beam splitter are concentrically assembled. The distance between the filter element and the beam splitter is 10mm-30mm, and the distance between the filter element and the LED is 5mm-20mm.

4. The temperature-controlled dual-optical-path colorimetric device according to claim 2, characterized in that, The plane containing the beam splitter forms a 45° angle with the plane containing the filter. The beam splitter is positioned at the junction of the light source optical path channel, the reference optical path channel, and the sample optical path channel. The light source optical path channel and the reference optical path channel are perpendicularly arranged and coaxially and in the same direction as the sample optical path channel, so that the monochromatic light generated by the light source optical path channel passes through the sample beam and the reference beam generated by the beam splitter and enters the sample optical path channel and the reference optical path channel, respectively.

5. The temperature-controlled dual-optical-path colorimetric device according to claim 2, characterized in that, The first photodiode is disposed at the end of the reference optical path channel away from the beam splitter to receive the reference beam reflected into the reference optical path channel. The center of the first photodiode, the center of the beam splitter, and the center of the filter are on the same horizontal plane. The distance between the center of the first photodiode and the center of the beam splitter is 10mm-30mm.

6. The temperature-controlled dual-optical-path colorimetric device according to claim 1, characterized in that, The colorimetric cell module also includes a colorimetric cell, with a mounting groove at the center of the colorimetric cell, and the colorimetric cell is disposed in the mounting groove. A first groove and a second groove are respectively provided on both sides of the colorimetric cell. A first protrusion and a second protrusion are respectively provided on the side of the light source and reference optical path module and the detection optical path module near the colorimetric cell. The light source and reference optical path module and the detection optical path module are respectively adapted and connected to the first groove and the second groove on both sides of the colorimetric cell through the first protrusion and the second protrusion, so that the sample beam transmitted into the sample optical path channel passes through the colorimetric cell and enters the detection optical path channel.

7. The temperature-controlled dual-optical-path colorimetric device according to claim 6, characterized in that, The first protrusion and the second protrusion are respectively provided with a first through hole and a second through hole, and are connected to the sample optical path channel and the detection optical path channel through the first through hole and the second through hole, respectively. The first groove and the second groove are also respectively provided with a third through hole and a fourth through hole, and are connected to the colorimetric cell. The sample optical path channel is connected to the third through hole through the first through hole so that the sample light beam transmitted to the sample optical path channel illuminates the colorimetric cell. The detection optical path channel is connected to the fourth through hole through the second through hole so that the sample light beam passing through the colorimetric cell is received by the second photodiode.

8. The temperature-controlled dual-optical-path colorimetric device according to claim 1, characterized in that, The detection optical path module further includes a focusing element, which is disposed within the detection optical path channel. The focusing element and the second photodiode are concentrically assembled and respectively disposed at both ends of the detection optical path channel. The distance between the focusing element and the second photodiode is 10mm-30mm. The focusing element is disposed on the side of the detection optical path channel closer to the colorimetric cell, so that the sample beam passing through the colorimetric cell passes through the focusing element within the detection optical path channel and is then received by the second photodiode. The second heat-conducting component has multiple second positioning slots adapted to the focusing element, the second photodiode, and the second temperature detection component.

9. The temperature-controlled dual-optical-path colorimetric device according to claim 1, characterized in that, The first heating element and the second heating element are respectively provided on one side of the outer surface of the first heat-conducting element and the second heat-conducting element, and the first temperature detection element and the second temperature detection element are respectively provided on the opposite side, at a distance of 3mm-6mm from the edge.

10. The temperature-controlled dual-optical-path colorimetric device according to claim 1, characterized in that, The outer surfaces of the first heat-conducting component and the second heat-conducting component are respectively covered with a first heat-insulating component and a second heat-insulating component, and the first heat-insulating component and the second heat-insulating component are respectively provided with openings adapted to the sample optical path channel and the detection optical path channel.

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