An apparatus and method for measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water

Abstract

The present invention relates to a device and method for measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water. The device includes a low-pressure mercury lamp to be measured, a lamp output probe, a test device for electro-optical conversion efficiency in air, a test device for electro-optical conversion efficiency in water, and a data processing system. The method includes the following steps: obtaining the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in air and the electro-optical conversion efficiency; obtaining the readings of the lamp output probe of the low-pressure mercury lamp to be measured under different water temperature conditions; and calculating the electro-optical conversion efficiency of the low-pressure mercury lamp to be measured under different water temperature conditions according to the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in air and the electro-optical conversion efficiency, and the readings of the lamp output probe of the low-pressure mercury lamp to be measured under different water temperature conditions. This method can accurately measure the electro-optical conversion efficiency of a low-pressure mercury lamp under different water temperature conditions, and thus effectively guide the reasonable design, operation and maintenance of ultraviolet disinfection devices. The present invention can be widely applied to the field of environmental protection water treatment technology.

Description

Technical Field

[0001] The present invention relates to a device and method for accurately measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water, belonging to the technical field of environmental protection water treatment. Background Art

[0002] Ultraviolet light has the advantages of broad-spectrum disinfection, high sterilization efficiency, small floor area, no by-products, etc., and has been widely used in the disinfection of drinking water, secondary water supply, domestic sewage, ship ballast water, etc. Low-pressure mercury lamps (including liquid mercury lamps or amalgam lamps) are important ultraviolet light sources. At present, low-pressure mercury lamps are required to mark their electro-optical conversion efficiency in air when sold, and its test method is proposed by the International Ultraviolet Association (IUVA), that is, using an ultraviolet irradiance meter to measure the irradiance at a certain distance from the lamp to be tested in air, and calculating the electro-optical conversion efficiency of the low-pressure mercury lamp in air at room temperature (25°C) using the Keitz formula.

[0003] The electro-optical conversion efficiency of a low-pressure mercury lamp is closely related to the mercury vapor pressure. During actual operation, the mercury vapor pressure will change with the change of the lamp surface temperature. When the ultraviolet disinfection device is applied in different seasons and regions, different water temperatures will affect the lamp surface temperature and mercury vapor pressure, and then affect the actual electro-optical conversion efficiency. Therefore, applying the electro-optical conversion efficiency of a low-pressure mercury lamp measured in air (at room temperature) to water treatment will cause large errors. Accurately measuring the relationship between the electro-optical conversion efficiency of a low-pressure mercury lamp and the water temperature is of great significance for the reasonable design, operation and maintenance of ultraviolet reactors (such as regular replacement of low-pressure mercury lamps), so as to achieve the long-term, efficient and stable operation of ultraviolet disinfection devices.

[0004] Conventional ultraviolet irradiance meters are large in volume and complex in structure, and the test results are affected by factors such as changes in water body UVT and scaling of the casing, and cannot be applied to the measurement of the relationship between the electro-optical conversion efficiency of a low-pressure mercury lamp and the water temperature. Summary of the Invention

[0005] In view of the above problems, the purpose of the present invention is to provide a device and method for accurately measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water. Based on this method, the relationship between the electro-optical conversion efficiency of a low-pressure mercury lamp and the water temperature can be accurately obtained, so as to guide the reasonable design, operation and maintenance of ultraviolet reactors, and realize the long-term, efficient and stable operation of ultraviolet disinfection devices.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] In the first aspect, a device for measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water is provided, including:

[0008] A low-pressure mercury lamp to be tested, a lamp output probe, an electro-optical conversion efficiency test device in air, an electro-optical conversion efficiency test device in water, and a data processing system;

[0009] The low-pressure mercury lamp to be measured includes a lamp tube and lamp caps arranged at both ends of the lamp tube;

[0010] The lamp output probe is installed on the low-pressure mercury lamp to be measured, and the photosensitive part of the lamp output probe is at one end of the probe and is installed closely against the lamp tube. The other end of the lamp output probe is connected to a digital recorder, and the digital recorder is used to record the reading of the lamp output probe;

[0011] The air electro-optical conversion efficiency test device is used to determine the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in air and the electro-optical conversion efficiency;

[0012] The water electro-optical conversion efficiency test device is used to determine the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in water and different water temperatures;

[0013] The data processing system is used to calculate the electro-optical conversion efficiency of the low-pressure mercury lamp to be measured under different water temperature conditions according to the relationship between the reading of the lamp output probe in air and the electro-optical conversion efficiency and the reading of the lamp output probe of the low-pressure mercury lamp to be measured at different water temperatures.

[0014] Preferably, the lamp output probe is arranged on the lamp cap of the low-pressure mercury lamp to be measured, and the photosensitive part of the lamp output probe is arranged on the surface of the lamp tube.

[0015] Preferably, the air electro-optical conversion efficiency test device includes: an ultraviolet irradiance meter, a wall, a light-shielding plate with a light slit, and a black light-shielding cloth; the four walls and the ceiling and the ground enclose a closed test space, and the black light-shielding cloth is surrounded above the closed test space; the low-pressure mercury lamp to be measured, the light-shielding plate with a light slit, and the ultraviolet irradiance meter are arranged at intervals on a preset test track in sequence.

[0016] Preferably, the water electro-optical conversion efficiency test device includes a water circulation system, a water bath tank, and a sleeve; the sleeve is sleeved outside the low-pressure mercury lamp to be measured and the lamp output probe and completely wraps the low-pressure mercury lamp to be measured; the water bath tank is provided with a water inlet and a water outlet, and the water inlet and the water outlet are respectively connected to the water circulation system through pipelines for controlling the water temperature of the circulating water, thereby changing the temperature of the surface of the low-pressure mercury lamp in the sleeve and the electro-optical conversion efficiency of the lamp, and measuring the reading of the lamp output probe of the low-pressure mercury lamp to be measured under different water temperature conditions.

[0017] Preferably, the device further includes a voltage stabilizer and a power analyzer. The voltage stabilizer is used to provide power for the low-pressure mercury lamp to be measured; the power analyzer is used to measure the power supply voltage, current, power, frequency, and harmonic parameters for subsequent calculation.

[0018] In a second aspect, a method for measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water is provided, including the following steps:

[0019] Obtain the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in the air and the electro-optical conversion efficiency;

[0020] Obtain the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in water and different water temperatures;

[0021] According to the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in the air and the electro-optical conversion efficiency, and the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in water and different water temperatures, calculate the electro-optical conversion efficiency of the low-pressure mercury lamp to be measured under different water temperature conditions.

[0022] Preferably, the method for obtaining the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in the air and the electro-optical conversion efficiency includes:

[0023] Measure the electro-optical conversion efficiency of the low-pressure mercury lamp to be measured in the air;

[0024] Install a lamp output probe on the low-pressure mercury lamp to be measured, and use the electro-optical conversion efficiency test device in the air to measure the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in the air and the electro-optical conversion efficiency.

[0025] Preferably, the method for obtaining the reading of the lamp output probe of the low-pressure mercury lamp to be measured under different water temperature conditions includes:

[0026] Set the initial temperature of the water circulation system, turn on the low-pressure mercury lamp to be measured, and wait for a preset period of time until the low-pressure mercury lamp to be measured is stable, then read the reading of the lamp output probe;

[0027] Adjust the temperature of the water circulation system at a preset temperature interval, and read the reading of the lamp output probe after waiting for a preset period of time;

[0028] Repeat the above steps until the readings of the lamp output probes of the low-pressure mercury lamp to be measured at all set temperatures are obtained.

[0029] Preferably, the electro-optical conversion efficiency of the low-pressure mercury lamp to be measured under different water temperature conditions is:

[0030] E(T1) = P(T1) / P 总

[0031] Wherein, E(T1) is the lamp electro-optical conversion efficiency at water temperature T1; P(T1) is the lamp output power at water temperature T1; P 总 is the electric power provided by the voltage stabilizer.

[0032] Due to the above technical solutions, the present invention has the following advantages: The present invention takes the lamp output probe installed on the surface of the low-pressure mercury lamp to be measured as a bridge. On the one hand, it is connected to the standard method of the electro-optical conversion efficiency in the air of the International Ultraviolet Association. On the other hand, it measures the relative change of the electro-optical conversion efficiency at different water temperatures, and obtains the electro-optical conversion efficiency of the low-pressure mercury lamp to be measured at different water temperatures through calculation. The method of the present invention is simple to operate and accurate in measurement, and can be widely applied to the field of environmental protection water treatment technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the installation of the lamp output probe provided by an embodiment of the present invention;

[0034] Figure 2 It is a schematic structural diagram of the electro-optical conversion efficiency test device in the air provided by an embodiment of the present invention;

[0035] Figure 3 It is a schematic structural diagram of the electro-optical conversion efficiency test device in water provided by an embodiment of the present invention;

[0036] Figure 4 It is the influence of water temperature on the electro-optical conversion efficiency of the low-pressure mercury lamp. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention fall within the protection scope of the present invention.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] Embodiment 1

[0040] As Figures 1 to 3As shown in the figure, a device for measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water provided in this embodiment includes: a low-pressure mercury lamp to be measured 1, a lamp output probe 2, an electro-optical conversion efficiency test device in air, an electro-optical conversion efficiency test device in water, and a data processing system. Among them, the low-pressure mercury lamp to be measured 1 includes a lamp tube 11 and lamp caps 12 provided at both ends of the lamp tube 11; the lamp output probe 2 is installed on the low-pressure mercury lamp to be measured 1, and the photosensitive end of the lamp output probe 2 is arranged on one side of the lamp tube 11, and the output end of the lamp output probe 2 is connected to the data processing device; the electro-optical conversion efficiency test device in air is used to measure the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in air and the electro-optical conversion efficiency; the electro-optical conversion efficiency test device in water is used to measure the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in water and different water temperatures; the data processing system is used to calculate the electro-optical conversion efficiency of the low-pressure mercury lamp to be measured under different water temperature conditions according to the relationship between the reading of the lamp output probe in air and the electro-optical conversion efficiency and the reading of the lamp output probe of the low-pressure mercury lamp to be measured at different water temperatures.

[0041] Preferably, the device further includes a voltage stabilizer and a power analyzer. Among them, the voltage stabilizer is used to provide a stable power supply for the low-pressure mercury lamp to be measured; the power analyzer is used for accurate measurement of parameters such as power supply voltage, current, power, frequency, and harmonics for subsequent calculation.

[0042] Preferably, the lamp output probe 2 is arranged on the lamp cap 12 of the low-pressure mercury lamp to be measured 1, and the photosensitive end of the lamp output probe 2 extends from the lamp cap 12 of the low-pressure mercury lamp to be measured 1 towards the lamp tube 11, and the extension distance is 5 cm.

[0043] Preferably, as Figure 2 shown, the electro-optical conversion efficiency test device in air includes: an ultraviolet irradiance meter 3, walls 4, 5, 6 surrounded by black light-shielding cloth, and a second light-shielding plate 7. The walls, ceiling, and floor of this enclosed test space are surrounded by black light-shielding cloth; the low-pressure mercury lamp to be measured 1, the lamp output probe 2, the light-shielding plate 7 with a light slit, and the ultraviolet irradiance meter 3 are arranged at intervals on a preset test track in sequence.

[0044] Preferably, the distance between the low-pressure mercury lamp to be measured 1 and the wall 5 is 1.0 m.

[0045] Preferably, the distance between the low-pressure mercury lamp to be measured 1 and the light-shielding plate 7 is 0.3 m.

[0046] Preferably, the distance between the low-pressure mercury lamp to be measured 1 and the ultraviolet irradiance meter 3 is 1.0 m to 6.0 m.

[0047] Preferably, as Figure 3As shown in the figure, the test device for the electro-optical conversion efficiency in water includes a water circulation system 8, a water bath 9, and a sleeve 10. Among them, the sleeve 10 is sleeved outside the low-pressure mercury lamp 1 to be tested and the lamp output probe 2, and completely wraps the low-pressure mercury lamp 1 to be tested; the water bath 9 is provided with a water inlet and a water outlet, and the water inlet and the water outlet are respectively connected to the water circulation system 8 through pipelines, and are used to control the temperature of the low-pressure mercury lamp 1 to be tested in the sleeve 10, so as to measure the readings of the lamp output probe 2 of the low-pressure mercury lamp 1 to be tested under different water temperature conditions.

[0048] Preferably, the sleeve 10 is made of quartz.

[0049] Embodiment 2

[0050] Based on the device for measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water provided in Embodiment 1, this embodiment provides a method for measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water, including the following steps:

[0051] Step 1: Based on the test device for the electro-optical conversion efficiency in air, obtain the relationship between the reading of the lamp output probe 2 of the low-pressure mercury lamp 1 to be tested in air and the electro-optical conversion efficiency;

[0052] Step 2: Based on the test device for the electro-optical conversion efficiency in water, obtain the relationship between the reading of the lamp output probe 2 of the low-pressure mercury lamp 1 to be tested in water and different water temperatures;

[0053] Step 3: According to the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be tested in air and the electro-optical conversion efficiency, and the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be tested in water and different water temperatures, calculate the electro-optical conversion efficiency of the low-pressure mercury lamp 1 to be tested under different water temperature conditions.

[0054] Preferably, in the above Step 1, it specifically includes the following steps:

[0055] Measure the electro-optical conversion efficiency of the low-pressure mercury lamp to be tested in air according to the relevant standards of the International Ultraviolet Association (IUVA);

[0056] Install the lamp output probe 2 on the low-pressure mercury lamp 1 to be tested, and use the test device for the electro-optical conversion efficiency in air to measure the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be tested in air and the electro-optical conversion efficiency.

[0057] Preferably, in the above Step 2, it specifically includes the following steps:

[0058] Set the initial temperature of the water circulation system, turn on the low-pressure mercury lamp 1 to be tested, wait for a preset time period until its output is stable, and then read the reading of the lamp output probe 2; among them, the preset time period can be set to 30 minutes;

[0059] Adjust the temperature of the water circulation system 8 at a preset temperature interval, and read the indication of the lamp output probe 2 after the output of the low-pressure mercury lamp 1 to be measured is stable; among them, the preset temperature interval can be selected as 5 °C;

[0060] Repeat the above steps until the indications of the lamp output probe 2 of the low-pressure mercury lamp 1 to be measured at all set temperatures are obtained.

[0061] Preferably, in step 3 above, the electro-optical conversion efficiency of the low-pressure mercury lamp to be measured under different water temperature conditions is:

[0062] E(T1)= P(T1) / P 总

[0063] wherein, E(T1) is the electro-optical conversion efficiency of the lamp at the water temperature T1; P(T1) is the lamp output power at the water temperature T1; P 总 is the electric power provided by the voltage stabilizer.

[0064] Among them, the calculation formula of P(T1) is:

[0065] P(T1) = P0× [D(T1) / D0]

[0066] wherein, P(T1) is the lamp output power at the water temperature (T1); P0 is the lamp output power measured in the air; D(T1) is the indication of the lamp output probe at the water temperature T1; D0 is the indication of the lamp output probe in the air.

[0067] Example 3:

[0068] In this embodiment, taking four low-pressure mercury lamps A, B, C, and D as examples, the electro-optical conversion efficiency is tested. First, test the electro-optical conversion efficiency of the low-pressure mercury lamp to be measured in the air according to the standard method of the International Ultraviolet Association, and at the same time obtain the indication of the lamp output probe to establish the relationship between the indication of the lamp output probe and the electro-optical conversion efficiency. Then, the electro-optical conversion efficiency of the low-pressure mercury lamp and the water temperature are carried out in the water electro-optical conversion efficiency test system. Adjust the water temperature so that the initial temperature is lower than 5 °C. Turn on the low-pressure mercury lamp. After its output is fully stable (take 30 min as a conservative value), adjust the water temperature to 5.0, 10.0, 15.0, 20.0, 25.0, 30.0, 35.0 °C respectively, and read the indication of the lamp output probe. Finally, based on the test results of the electro-optical conversion efficiency in the air, determine the relationship between the indication of the lamp output probe and the electro-optical conversion efficiency, and calculate the relationship between the water temperature and the electro-optical conversion efficiency.

[0069] Such as Figure 4As shown in the figure, it is the experimental results of the electro-optical conversion efficiency of low-pressure mercury lamps under different water temperature conditions. Generally speaking, the electro-optical conversion efficiencies of the 4 low-pressure mercury lamps all gradually increase. The increase in water temperature will cause the surface temperature of the lamp to rise, which in turn increases the mercury vapor pressure of the low-pressure mercury lamp, resulting in changes in the electro-optical output efficiency. Different manufacturers have different product characteristics, and the mercury injection amounts set according to the application scenarios also vary. Therefore, when the surface temperature (or water temperature) of the lamp changes, the change rules of the lamp output among the lamps and the optimal surface temperature points of the lamps are all different. Figure 1 The results show that the electro-optical conversion efficiency of lamp C in water (5 - 35 °C) is higher than that of the other 3 lamps. The water temperature changes of lamps A and B are not much different, and the electro-optical efficiency of lamp D is the lowest under the water temperature. This result indicates that in the design of ultraviolet disinfection devices, suitable UV lamps and correct lamp parameters should be selected according to different application environments, different regions, different seasons, and different water temperature conditions, which can further improve the efficiency of ultraviolet disinfection devices and ensure disinfection safety.

[0070] The embodiment of the present invention has developed a method for measuring the electro-optical conversion efficiency of low-pressure mercury lamps in water. The electro-optical conversion efficiency of low-pressure mercury lamps under different water temperature conditions is measured by a lamp output probe placed between the lamp tube and the sleeve. This method has a simple operation process, accurate measurement results, can quickly obtain the relationship between the electro-optical conversion efficiency of low-pressure mercury lamps and the water temperature, and can effectively guide the reasonable design, operation, and maintenance of ultraviolet disinfection devices. In recent years, ultraviolet disinfection technology has been widely used in the water treatment field. This measurement method is expected to be popularized and applied in actual ultraviolet disinfection equipment to achieve the dual purposes of safe disinfection and energy conservation and consumption reduction, so it has broad industrialization prospects.

[0071] The above embodiments are only used to illustrate the present invention. The structures, connection methods, manufacturing processes, etc. of each component can all be changed. Any equivalent transformation and improvement based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. An apparatus for measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water, characterized in that, Comprising: A low-pressure mercury lamp to be measured, a lamp output probe, an air electro-optical conversion efficiency test device, a water electro-optical conversion efficiency test device, and a data processing system; The low-pressure mercury lamp to be measured includes a lamp tube and lamp caps provided at both ends of the lamp tube; The lamp output probe is installed on the low-pressure mercury lamp to be measured, and the photosensitive end of the lamp output probe is provided on one side of the lamp tube, and the output end of the lamp output probe is connected to a data processing device; The air electro-optical conversion efficiency test device is used to measure the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in air and the electro-optical conversion efficiency; The water electro-optical conversion efficiency test device is used to measure the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in water and different water temperatures; The data processing system is used to calculate the electro-optical conversion efficiency of the low-pressure mercury lamp to be measured under different water temperature conditions according to the relationship between the reading of the lamp output probe in air and the electro-optical conversion efficiency and the reading of the lamp output probe of the low-pressure mercury lamp to be measured under different water temperatures; The electro-optical conversion efficiency of the low-pressure mercury lamp to be measured under different water temperature conditions is: E(T1)= P(T1) / P 总 Among them, E(T1) is the lamp electro-optical conversion efficiency at water temperature T1; P(T1) is the lamp output power at water temperature T1; P 总 is the electric power provided by the voltage regulator; Wherein, the calculation formula of P(T1) is: P(T1) = P0 × [D(T1) / D0] Wherein, P(T1) is the lamp output power at water temperature T1; P0 is the lamp output power measured in air; D(T1) is the reading of the lamp output probe at water temperature T1; D0 is the reading of the lamp output probe in air.

2. The device for measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water according to claim 1, characterized in that, The lamp output probe is provided on the lamp cap of the low-pressure mercury lamp to be measured, and the photosensitive end of the lamp output probe is provided on the surface of the lamp tube.

3. A method for measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water using the device according to any one of claims 1 to 2, characterized in that, Including the following steps: Obtain the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in air and the electro-optical conversion efficiency; Obtain the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in water and different water temperatures; Calculate the electro-optical conversion efficiency of the low-pressure mercury lamp to be measured under different water temperature conditions according to the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in air and the electro-optical conversion efficiency and the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in water and different water temperatures.

4. The method for measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water according to claim 3, characterized in that, The method for obtaining the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in air and the electro-optical conversion efficiency includes: Measure the electro-optical conversion efficiency of the low-pressure mercury lamp to be measured in air; Install a lamp output probe on the low-pressure mercury lamp to be measured, and use the air electro-optical conversion efficiency test device to measure the relationship between the reading of the lamp output probe of the low-pressure mercury lamp to be measured in air and the electro-optical conversion efficiency.

5. The method for measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water according to claim 3, characterized in that, The method for obtaining the reading of the lamp output probe of the low-pressure mercury lamp to be measured under different water temperature conditions includes: Set the initial temperature of the water circulation system, turn on the low-pressure mercury lamp to be measured, wait for a preset time period until the low-pressure mercury lamp to be measured is stable, and read the reading of the lamp output probe; Adjust the temperature of the water circulation system at a preset temperature interval, and read the reading of the lamp output probe after waiting for a preset time period; Repeat the above steps until the readings of the lamp output probe of the low-pressure mercury lamp to be measured at all set temperatures are obtained.

6. The method for measuring the electro-optical conversion efficiency of a low-pressure mercury lamp in water according to claim 3, characterized in that, The electro-optical conversion efficiency of the low-pressure mercury lamp to be measured under different water temperature conditions is: E(T1)= P(T1) / P 总 Among them, E(T1) is the lamp electro-optical conversion efficiency at water temperature T1; P(T1) is the lamp output power at water temperature T1; P 总 is the electric power provided by the voltage regulator.

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