Fluorescent lamp luminous efficiency detection method and device and fluorescent lamp monitoring method

Abstract

The present invention relates to a fluorescent lamp luminous efficiency detection method and device and a fluorescent lamp monitoring method. The fluorescent lamp luminous efficiency detection method adopts the same test conditions to respectively detect the current illuminance value X and the illuminance value A when the fluorescent lamp is not put into use at the same position, and calculates the luminous efficiency K of the fluorescent lamp by the formula K=X / A×100%. The fluorescent lamp luminous efficiency detection device mainly consists of an ultraviolet light emitting device, an illuminance sensor and a data processing module. The fluorescent lamp monitoring method uses a period T a Detect the luminous efficiency of the fluorescent lamp, and when the luminous efficiency of the fluorescent lamp is less than threshold I and greater than threshold II, b Continue to test, and when the luminous efficiency of the fluorescent lamp is less than or equal to the threshold II, replace the fluorescent lamp with a period of T a Continue to detect, period T a Greater than period T b The present invention can issue an early warning prompt in time when the lighting equipment fails to meet the parameter requirements or the equipment usage time is close to the design life.

Description

Technical Field

[0001] The invention belongs to the technical field of classroom lighting, and relates to a method and device for detecting the luminous efficiency of a fluorescent lamp and a method for monitoring the fluorescent lamp. Background Art

[0002] The school classroom is an important place for students to receive various knowledge education. Sufficient light intensity in the classroom can not only enable students to clearly see the contents on the blackboard but also allow teachers to teach more conveniently. Studies have shown that sufficient light can promote the improvement of people's vision, emotions and brain effects. Therefore, it is very important to create a good classroom lighting environment suitable for students to learn and teachers to teach.

[0003] At present, the establishment of lighting environment in classrooms is generally based on fluorescent lamps. Fluorescent lamps are low-pressure mercury discharge photoluminescent electric light sources, mainly composed of energy-saving fluorescent lamp tubes and electronic ballasts (driving power sources). The luminescence mechanism of fluorescent lamps involves two basic physical processes: gas mercury discharge and photoluminescence. During the ignition process, energy-saving fluorescent lamp tubes and electronic ballasts (driving power sources) influence and interact with each other, forming many macro technical characteristics of fluorescent lamps such as luminescence.

[0004] However, under the mutual influence and interaction between energy-saving fluorescent lamps and electronic ballasts (driving power source), fluorescent lamps will not only produce characteristics such as luminescence, but also produce light decay effects. The light decay of fluorescent lamps is a complex quantitative change process that occurs in the two basic physical processes of gas mercury discharge and photoluminescence during the ignition process. In this quantitative change process, a series of physical and chemical movement processes in the microscopic field inside the energy-saving fluorescent lamp are internal factors, and the electrical characteristics of the electronic ballast (driving power source) are external factors. The internal factors are dominant, and the external factors are conditions. The external factors act through the internal factors. The light decay of fluorescent lamps mainly comes from four aspects: light decay caused by impurities in the energy-saving fluorescent lamps, light decay caused by phosphor powder, light decay caused by lamp glass, and light decay caused by the output characteristics of the electronic ballast (driving power source).

[0005] A good light environment in the classroom is related to the illumination of the fluorescent lamp, and illumination refers to the luminous flux of visible light received per unit area, and luminous flux refers to the radiation power that can be felt by the human eye, which is equal to the product of the radiation energy of a certain band per unit time and the relative visibility of the band; considering that the influence of glass light quality and baking tube ventilation temperature on luminous flux is negligible, the quality of phosphor and powder coating layer will have a greater impact on luminous flux, that is, the quality of phosphor and powder coating layer is directly related to the illumination of the fluorescent lamp; after using the equipment for a long time, the quality of phosphor and powder coating layer will decrease and age, resulting in a strong light decay of the fluorescent lamp, which leads to the equipment seemingly lighting up normally after a period of use, but the illumination of the fluorescent lamp is actually weakened, and the light environment is not up to standard. Since the equipment has not had an obvious fault at this time, the lighting monitoring system in the prior art cannot give prompts and warnings in time, which leads to the light intensity in the classroom may not actually enable students to clearly see the content on the blackboard, which will also have a certain impact on the teacher's teaching.

[0006] Therefore, it is of great significance to study a fluorescent lamp luminous efficiency detection method and device as well as a fluorescent lamp monitoring method that can regularly detect fluorescent lamp equipment and can promptly give prompts and warnings when the fluorescent lamp luminous flux does not meet the standard. Summary of the invention

[0007] The purpose of the present invention is to overcome the defect that the lighting monitoring system in the prior art cannot give prompts and warnings in time when the actual illumination is insufficient due to the fluorescent lamp luminous flux not meeting the standard, and proposes a detection method and device for the luminous efficiency of a fluorescent lamp and a monitoring method for a fluorescent lamp. When no obvious failure occurs in the equipment, by collecting data related to the operating status of the equipment, it is determined whether the relevant parameters of the equipment meet the standards and whether the equipment can continue to be used. When the luminous flux of the fluorescent lamp or lighting equipment does not meet the standard, a relevant warning is given and the equipment is replaced.

[0008] To achieve the above object, the scheme adopted by the present invention is as follows:

[0009] The fluorescent lamp luminous efficiency detection method adopts the same test conditions to detect the current illuminance value X and the illuminance value A at the same position of the fluorescent lamp when it is not put into use, and the luminous efficiency K of the fluorescent lamp is calculated by the formula K=X / A×100%;

[0010] In the present invention, the illuminance value A before being put into use is a measured value, and can also be a theoretical standard value. When it is a theoretical standard value, the entire detection process is more convenient. However, since different fluorescent lamps have certain differences to a greater or lesser extent, these differences lead to certain differences in the illuminance value A before being put into use. If the illuminance value A before being put into use is a theoretical standard value, a large error is likely to occur. Therefore, the illuminance value A of each fluorescent lamp before being put into use is preferably obtained by measurement;

[0011] The test method of illuminance value is: when the fluorescent lamp is powered off, a specific ultraviolet light is used to irradiate the fluorescent lamp to excite the phosphor, and then the visible light emitted by the phosphor after being excited is detected to generate the illuminance value;

[0012] The specific ultraviolet light has two characteristic wavelengths of 165nm and 274nm, and each includes an interval centered on each characteristic wavelength and having an interval of ±20nm; the fluorescent lamp is a gas discharge lamp, which consists of a transparent glass lamp tube, a layer of fluorescent powder evenly coated on the tube wall, metal electrodes installed at both ends and sealed, and conductive metal lamp pins are led out, the tube is evacuated, and a certain amount of mercury is poured in to form steam. When voltage is applied to the electrodes at both ends and an arc is excited in the mercury vapor, under the action of the arc, the mercury vapor is excited to emit ultraviolet light that irradiates the fluorescent powder on the tube wall. The characteristic spectrum of the mercury vapor is 164 nanometers and 253.7 nanometers, of which 253.7 nanometers accounts for about 80%. The fluorescent powder mainly absorbs the energy of 253.7 nanometer ultraviolet light to generate visible light, which irradiates outside the lamp tube to form a lighting effect; since the fluorescent powder can fully absorb the ultraviolet light of 253.7nm and generate light that can be seen by the naked eye, ultraviolet light with a wavelength of 165-274nm and an intensity of 6000 microwatts is selected;

[0013] The angle between the incident ultraviolet rays and the visible light emitted by the fluorescent powder after being excited is less than 45 degrees.

[0014] When fluorescent lamps are used for a long time, the luminous efficiency of the fluorescent powder in the tube will decay over time. In the industry, L70 (i.e., the luminous flux decays from 100% at the factory to 70%) is usually agreed to be the life of the fluorescent lamp. The life of the common fluorescent lamps used for lighting on the market is about 5000h. Due to factors such as the decay of the luminous efficiency of the fluorescent powder, the actual life will be less than 5000. When the luminous flux decays to 70%, it is considered that the lighting effect of the fluorescent lamp can no longer meet the use requirements. Since the main reason for the decay of fluorescent light flux is the decay and loss of the fluorescent powder, it can be considered that when the luminous flux of the fluorescent lamp decays to 70%, it can be considered that the fluorescent powder has decayed to 70%. Luminous flux is the sum of the visible light emitted by the luminous body per second, that is, luminous flux. The unit of illumination is lux, which is the luminous flux of the luminous body irradiating the unit area of ​​the illuminated object. When the illuminated area remains unchanged, the luminous flux and illumination are proportional. Therefore, the change in illuminance can be used to measure the change in luminous flux.

[0015] As a preferred solution:

[0016] In the above-mentioned fluorescent lamp luminous efficiency detection method, the specific ultraviolet irradiation position is the electrode end of the fluorescent lamp tube. The life of the fluorescent lamp tube electrode is one of the factors of the lamp tube life. In the later period of the fluorescent lamp life, the fluorescent layer at the lamp head, i.e. the electrode, turns black, and there is a stroboscopic phenomenon of light flashing when the fluorescent lamp is lit. This is one of the important reasons for the loss of the use value of the fluorescent lamp. The present invention sets the detection position at the electrode end of the fluorescent lamp tube to more accurately evaluate the use of the fluorescent lamp.

[0017] The present invention also provides a fluorescent lamp luminous efficiency detection device using the fluorescent lamp luminous efficiency detection method as described above, which is mainly composed of an ultraviolet light emitting device, a light intensity sensor and a data processing module;

[0018] The ultraviolet light emitting device is used to emit the specific ultraviolet light;

[0019] The light intensity sensor is used to detect the visible light emitted by the fluorescent powder after being excited at a specified distance, generate a light intensity value, and send it to the data processing module;

[0020] The data processing module is used to store the illuminance value and calculate the luminous efficiency of the fluorescent lamp.

[0021] The structure of the detection device of the present invention is not limited to this, and can also be another structure. The main difference between the two structures is whether it contains an ultraviolet light-emitting device, and the main difference in the use of the two structures is whether the fluorescent lamp is powered on. The one containing an ultraviolet light-emitting device is defined as active, and it can use an ultraviolet light source (referred to as active) to irradiate the fluorescent coating when the fluorescent lamp is turned off, and then detect the intensity of the light after irradiating the fluorescent coating. Through data analysis, the luminous efficiency of the fluorescent lamp can be obtained. The active device can be made into a handheld detection device with flexible usage; the one not containing an ultraviolet light-emitting device is defined as passive, and it can directly detect the illuminance value when the fluorescent lamp is turned on, without the need for an ultraviolet light source, and the detection device can be directly fixed at a specified position of the lamp tube, such as on a grid 1 to 2 cm directly below the electrode end of the fluorescent lamp tube. The preferred position is outside the fluorescent powder coating at the electrode of the lamp tube, and can be located at the upper part of the lamp tube without affecting the downward lighting of the lamp tube.

[0022] As a preferred solution:

[0023] The fluorescent lamp luminous efficiency detection device as described above further includes a data transmission module, and the fluorescent lamp luminous efficiency obtained by the data processing module can be transmitted to a receiving device through the data transmission module.

[0024] In the above-mentioned fluorescent lamp luminous efficiency detection device, the light intensity sensor is detachably fixed on the grid just below the electrode end of the fluorescent lamp tube. The distance between the light intensity sensor and the electrode end of the fluorescent lamp tube is 10mm or 20mm. Generally, the 20mm gear is selected. When the reading is low, the 10mm gear is selected to obtain 4 times the sensitivity. The detection spacing is divided into two gears, and the intensity relationship between the two data detections is four times, because the illumination of the illuminated surface is inversely proportional to the square of the distance from the light source. The ultraviolet rays are emitted to the measured point, and the visible light returned from the measured point is The actual distance of light is twice, and the square relationship is four times (in a homogeneous space, the light intensity of a "point light source" at any point is inversely proportional to the square of the distance. The present invention sends ultraviolet light to the measured point to generate a distance, and the measured point returns visible light, which generates another distance. Therefore, twice the distance, squared, is four times). The parameters of the light intensity sensor are: wavelength measurement range 380~730nm, accuracy ±7%, repeated test ±5%, temperature characteristics ±0.5% / ℃, measurement range 0~200000Lux.

[0025] In the fluorescent lamp luminous efficiency detection device as described above, the ultraviolet light emitting device is detachably fixed on the grid just below the electrode end of the fluorescent lamp tube, and the distance between the ultraviolet light emitting device and the electrode end of the fluorescent lamp tube is 10 mm or 20 mm.

[0026] The present invention also provides a monitoring method for a fluorescent lamp, with a period T aDetect the luminous efficiency of the fluorescent lamp, and when the luminous efficiency of the fluorescent lamp is less than threshold I and greater than threshold II, b Continue to test, and when the luminous efficiency of the fluorescent lamp is less than or equal to the threshold II, replace the fluorescent lamp with a period of T a Continue to detect; with a period of T b The condition for continuing the test may also be that the efficiency of the fluorescent lamp is greater than 90%, where the efficiency of the fluorescent lamp is the percentage of the usage time of the fluorescent lamp to the factory life of the fluorescent lamp; the condition for replacing the fluorescent lamp may also be that the efficiency of the fluorescent lamp is equal to 100%;

[0027] Wherein, the luminous efficiency of the fluorescent lamp is measured by the detection method of the luminous efficiency of the fluorescent lamp as described above;

[0028] Threshold I is obtained by taking the average value after detecting the luminous efficiency of multiple fluorescent lamps that are manually determined to have early failure characteristics, and threshold II is obtained by taking the average value after detecting the luminous efficiency of multiple fluorescent lamps that are manually determined to have early failure characteristics. The early failure characteristics are that the lighting effect can meet the use requirements but is not ideal, and the failure characteristics are that the lighting effect cannot meet the use requirements.

[0029] Period T a Greater than period T b , period T a and period T b can be adjusted according to actual needs, such as cycle T a One week or one day, that is, the detection frequency is once a week or once a day, and the period T b It is half a day or one hour, that is, the detection frequency is once half a day or once an hour.

[0030] The luminous efficiency of fluorescent lamps can reflect the life of fluorescent lamps. Therefore, the present invention proposes a monitoring method for fluorescent lamps based on the luminous efficiency of fluorescent lamps. The method can provide early warning and monitor the working status of fluorescent lamps in the later stage of their life. When the fluorescent lamps show signs of expiring in advance, instructions for timely replacement of the lamps are issued to ensure that the lighting environment always remains in good condition.

[0031] The monitoring principle is to periodically conduct online inspections on the luminous efficiency of all fluorescent lamps during the use of the fluorescent lamp lighting system, and to increase the number of inspections for individual fluorescent lamps that are in the late stage of their life or whose luminous efficiency has decreased during inspections. When the early signs of failure of fluorescent lamps are found, the lamps are monitored at a higher frequency, and instructions to replace the lamps are immediately issued when the failure signs are established.

[0032] As a preferred solution:

[0033] In the fluorescent lamp monitoring method described above, the number of fluorescent lamps is more than one, and the specific monitoring process is as follows:

[0034] (1) Detecting the illuminance value A of the fluorescent lamp when it is not in use, storing the lamp tube address and illuminance value A of the fluorescent lamp in the initial database, and setting i=1;

[0035] (2) Inspection cycle T a Conduct the i-th round of inspection to detect the luminous efficiency K of the fluorescent lamp;

[0036] (3) Determine whether the luminous efficiency K of the fluorescent lamp is less than the luminous efficiency warning threshold I. If so, proceed to the next step; otherwise, store the time mark, lamp address and luminous efficiency K of the fluorescent lamp in the inspection database. The lamp address of the same fluorescent lamp in the inspection database is the same as that in the initial database. Set i=i+1, detect the next lamp, and return to step (2). In this step, the particularly important fluorescent lamps in the entire lighting system can be directly entered into the next step without being judged, which is conducive to shortening the detection cycle and making a warning response in time.

[0037] (4) Determine whether the luminous efficiency K of the fluorescent lamp is less than or equal to a threshold value II (i.e., the luminous efficiency life value such as L70). If so, replace the fluorescent lamp and return to step (1) (returning to step (1) only refers to returning to step (1) for the replaced fluorescent lamp, and not returning to step (1) for the unreplaced fluorescent lamp). The lamp tube addresses of the fluorescent lamps before and after replacement are the same, and the initial K value of the new lamp tube is rewritten; otherwise, the time stamp, lamp tube address and luminous efficiency K of the fluorescent lamp are stored in the monitoring database, and the lamp tube address of the same fluorescent lamp in the monitoring database is the same as that in the initial database;

[0038] (5) With monitoring interval T b Monitor and detect the luminous efficiency K of each fluorescent lamp. N consecutive monitoring intervals constitute a round. When a round is completed or K is less than the luminous life threshold, return to step (4).

[0039] The time stamps in the monitoring process can be used for dynamic data analysis, and the inspection cycle can be set according to the importance of the occasion and the frequency of opening and closing.

[0040] From the perspective of the detection cycle, the present invention is equivalent to establishing a two-level database, namely a patrol database and a monitoring database. The number of database levels can be increased or decreased according to actual conditions and is not limited to the second level. Lighting systems with lower importance can be a first-level database, and particularly important lighting systems can be a third-level database, or even more.

[0041] In the fluorescent lamp monitoring method as described above, threshold I and threshold II are 85% and 70% respectively, and 85% and 70% are warning areas, which are examples for 15% margin warning in advance. For the 30% spatial phosphor attenuation space between 100% and 70%, the warning can be started from 50% of the attenuation space.

[0042] The online monitoring system of the present invention is composed of a data acquisition unit, a data transmission unit, a cloud server, a third-party platform and terminal users;

[0043] The data acquisition unit is used to collect the luminous efficiency of the fluorescent lamp (specifically, the detection device of the luminous efficiency of the fluorescent lamp of the present invention is used). The data acquisition object is not limited thereto, and can be increased according to actual needs. For example, it can detect whether the light is turned on through the switch signal, count the light-on time, detect the device current through the mutual inductor, detect the temperature through the temperature sensor, detect the humidity through the humidity sensor, etc. The data acquisition unit sends the collected data to the data transmission unit;

[0044] The data transmission unit is used to report the relevant data sent by the data acquisition unit to the cloud server through lora, nb-iot, Ethernet, etc. for real-time monitoring and data recording. The detection device of the luminous efficiency of the fluorescent lamp is detected when the power is off, and the collected data is transmitted after the power is turned on;

[0045] The advantages of LoRa-based communication are easy construction and deployment, long battery life, low power consumption, low cost, and a large number of supported terminals; the disadvantages are that gateways and LoRa modules need to be deployed in the early stage, which requires more costs;

[0046] The advantage of the communication method based on nb-iot is that users do not need to build base stations, but only need to rent the operator's network, so the initial cost is low. The disadvantage is that it has a poor ability to solve communication blind spots.

[0047] The cloud server is used to send relevant data to the third-party platform, and is also used to send relevant data sent by the third-party platform after data interaction to the end user;

[0048] The third-party platform is used to interactively process relevant data. An example is given below:

[0049] The third-party platform receives the corresponding voltage, device on / off time, phosphor parameters and other data. When the voltage or current of a lighting device does not meet the current parameter range, the use time of the lighting device exceeds the design life, the phosphor-related data does not meet the normal use conditions, etc., if one of the conditions does not meet the current requirements, it sends information such as the need to replace the device to the cloud server, which is then sent to the end user, and the cloud user responds;

[0050] The terminal user can perform specific maintenance on the equipment according to the relevant data. The terminal user can also operate on the user's PC, which will be sent to the monitoring terminal by the cloud server to control the monitoring terminal.

[0051] The hardware device interface of the entire monitoring system of the present invention includes a monitoring terminal, a lora gateway and other expansion devices;

[0052] The monitoring terminal supports Lora or nb-iot communication modules. The specific situation is considered from the scale and communication status, whether there is a communication blind spot, and whether it is suitable for the current scene; it supports 4-way switch quantity acquisition. The switch quantity input and output module is a device that can collect input / control output of switch quantity signals. It is also usually called a digital quantity I / O module. The switch quantity signal is collected to the computer through the RS-485 bus, or the computer sends relevant instructions to control the relevant state of the switch through the module. It can also communicate in pairs through the RS-485 bus to remotely control the relevant state of the switch. The lighting equipment can be turned on and off by controlling the relay signal. In addition, the use time of the lighting equipment can be specifically analyzed through the switch quantity signal; it supports 1-way transformer current detection, and the current change of the lighting equipment is reflected by the detection of the transformer current. Whether it is within the normal range; it supports 2-way S232 / RS485 communication, one of which is used for the transmission of data obtained by the acquisition of the switch quantity, and the other is used to transmit the data of the transformer current; it supports multiple phosphor detection devices; it supports DC5V power supply or DC5V external power supply;

[0053] Lora gateway supports Lora wireless communication. One Lora gateway can connect tens of thousands of Lora modules. The transmission distance in towns can reach 2-5km, and it has strong anti-interference ability. Lora modules can be selected as patch and pin type, which is more convenient; Lora gateway supports Ethernet or 4g network communication. Lora gateway has powerful network conversion capability, LoRa to TCP / IP protocol, and supports all-netcom, 4G, 3G, 2.5G networks, and APN / VPDN private networks. It also has IPSEC, PPTP, L2TP, GRE, OPENVPN and other VPN connections, with VPN client, server and other functions. On the basis of the private network, an additional layer of encryption is added for transmission to ensure the security and accuracy of data, providing more choices for project construction; Lora gateway supports terminal data record storage, and the maximum serial port data reaches 4000bit; Lora gateway supports Dc12v power supply;

[0054] Other expansion devices include corresponding sensors, which can add temperature, humidity, light and other sensors to collect corresponding data, and can add corresponding lora modules or access the communication network.

[0055] The hardware selection and connection of the entire monitoring system of the present invention are as follows (taking the school lighting system as an example):

[0056] 1. Hardware selection

[0057] Determine the number of LoRa gateways according to the number of teaching buildings (to ensure sufficient transmission distance), and determine the number of detection terminals and sensors according to the number of lighting equipment in the classroom;

[0058] The detection terminal integrates lora module, mutual inductor module, phosphor detection module, switch quantity module, corresponding sensors, relays and corresponding power supply, etc.

[0059] 2. Device connection

[0060] The detection terminal is connected to the lighting equipment. The relay, transformer module and switch module in the detection terminal are directly connected to the lighting equipment circuit to collect relevant data. Then, it is connected to the Lora module via RS-485 / S232. The Lora module transmits the data to the Lora gateway, thereby achieving the function of relevant data collection and transmission.

[0061] The data collected by the Lora gateway can be transmitted to the cloud server through the WiFi network, and the cloud server and the third-party platform cooperate to send corresponding instructions and data to the PC or mobile phone through the WiFi connection. Users can use and operate the lighting system, thereby achieving the function of monitoring lighting equipment.

[0062] Beneficial effects:

[0063] (1) The fluorescent lamp luminous efficiency detection method of the present invention can provide complete maintenance for the light environment. When the lighting equipment fails to meet the specific required parameters, the maintenance personnel are prompted to replace the lighting equipment in time to ensure that the light environment meets the standards.

[0064] (2) The fluorescent lamp luminous efficiency detection device of the present invention can monitor the equipment time specifically, and when the use time is close to the design life, relevant warnings will be issued to prompt maintenance personnel to replace it;

[0065] (3) The fluorescent lamp monitoring method of the present invention can remotely control the lighting equipment, saving labor costs and being convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 This is a schematic diagram of sampling of active detection devices;

[0067] Figure 2 To monitor the flow chart;

[0068] Among them, 1-lamp tube, 2-ultraviolet incident light, 3-fluorescent emission light, 4-angle between ultraviolet incident light and fluorescent emission light, 5-ultraviolet generating surface, 6-light receiving surface. DETAILED DESCRIPTION

[0069] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0070] The detection method of the luminous efficiency of fluorescent lamps adopts the same test conditions. When the fluorescent lamp is powered off, a specific ultraviolet light is used to irradiate the electrode end of the fluorescent lamp tube to excite the fluorescent powder, and the visible light emitted by the fluorescent powder after being excited is detected to obtain the current illuminance value X and the illuminance value A when not in use at the same position of the fluorescent lamp, respectively. The luminous efficiency K of the fluorescent lamp is calculated by the formula K=X / A×100%, wherein the specific ultraviolet light has two characteristic wavelengths of 165nm and 274nm, and each includes an interval, which is centered on each characteristic wavelength and has an interval of ±20nm. The angle between the incident ray of the specific ultraviolet light and the visible light emitted by the fluorescent powder after being excited is less than 45 degrees. The detection of the illuminance value adopts an active detection device. The sampling schematic diagram is shown in FIG. Figure 1 As shown, the lamp tube 1 is the object to be tested, and the test is carried out when the lights are turned off. The ultraviolet generating surface 5 is the ultraviolet effective emission window of the ultraviolet generating device, and the light receiving surface 6 is the effective receiving window of the light receiver. Its normal points to the center of the lamp tube when the distance between the light intensity sensor and the electrode end of the fluorescent lamp tube is 10mm or 20mm. The ultraviolet incident light 2 points to the center of the lamp tube when the distance between the ultraviolet generating device and the electrode end of the fluorescent lamp tube is 10mm or 20mm, that is, the normal of its ultraviolet emission plane points to the center of the lamp tube. The fluorescent emission light 3 is the visible light emitted by the lamp tube when it is excited by the ultraviolet light. Angle 4 is formed between the ultraviolet incident light 2 and the fluorescent emission light 3. The ultraviolet incident light 2 is emitted from the ultraviolet generating surface 5 to the lamp tube 1, and the fluorescent powder on the lamp tube 1 is excited to generate fluorescent emission light 3 and send it to the light receiving surface 6. The angle 4 between the ultraviolet incident light and the fluorescent emission light is less than 45 degrees.

[0071] The present invention also provides a fluorescent lamp luminous efficiency detection device using the fluorescent lamp luminous efficiency detection method as described above, which is mainly composed of an ultraviolet light emitting device, a light intensity sensor, a data processing module and a data transmission module, wherein the light intensity sensor is detachably fixed on a grid just below the electrode end of the fluorescent lamp tube, and the distance between the light intensity sensor and the electrode end of the fluorescent lamp tube is 10 mm or 20 mm, and two levels of detection distances are provided by corresponding elastic springs that can clamp the arc-shaped part of the lamp tube, and the accuracy of the detection distance is guaranteed, and the intensity relationship between the data detection of the two is four times, because the illumination of the illuminated surface The degree is inversely proportional to the square of the distance from the light source. The ultraviolet light is emitted to the measured point to generate a distance, and the visible light returned from the measured point to generate another distance. The actual distance of the light is twice, and the square relationship is four times different. At the same time, the relationship of 10mm or 20mm is also designed to be twice, so the double distance, squared again is four times. When the value of 20mm detection is very low, 10mm spacing is used for detection; the parameters of the light intensity sensor are: wavelength measurement range 380~730nm, accuracy ±7%, repeated test ±5%, temperature characteristics ±0.5% / ℃, measurement range 0~200000Lux;

[0072] The ultraviolet light emitting device is used to emit the specific ultraviolet light; the ultraviolet light emitting device is detachably fixed on the grid just below the electrode end of the fluorescent tube, and the distance between the ultraviolet light emitting device and the electrode end of the fluorescent tube is 10 mm or 20 mm;

[0073] The light intensity sensor is used to detect the visible light emitted by the fluorescent powder after being excited, generate a light intensity value, and send it to the data processing module;

[0074] The data processing module is used to store the illuminance value and calculate the luminous efficiency of the fluorescent lamp;

[0075] The data transmission module is used to transmit the luminous efficiency of the fluorescent lamp obtained by the data processing module to the receiving device.

[0076] The present invention also provides a fluorescent lamp monitoring method based on the fluorescent lamp luminous efficiency detection method (or a fluorescent lamp luminous efficiency detection device), the number of fluorescent lamps is more than one, such as Figure 2 The specific monitoring process is as follows:

[0077] (1) Detecting the illuminance value A of the fluorescent lamp when it is not in use, storing the lamp tube address and illuminance value A of the fluorescent lamp in the initial database, and setting i=1;

[0078] (2) With period T a Conduct the i-th round of inspection to detect the luminous efficiency K of the fluorescent lamp;

[0079] (3) Determine whether the luminous efficiency K of the fluorescent lamp is less than a threshold value I (specifically 85%). If so, proceed to the next step. Otherwise, store the time stamp, lamp address and luminous efficiency K of the fluorescent lamp in the inspection database. The lamp address of the same fluorescent lamp in the inspection database is the same as that in the initial database. Set i=i+1 and return to step (2).

[0080] (4) determining whether the luminous efficiency K of the fluorescent lamp is less than or equal to a threshold value II (specifically 70%); if so, replacing the fluorescent lamp and returning to step (1); the lamp tube address of the fluorescent lamp before and after the replacement is the same; otherwise, storing the time stamp, lamp tube address and luminous efficiency K of the fluorescent lamp in a monitoring database; the lamp tube address of the same fluorescent lamp in the monitoring database is the same as that in the initial database;

[0081] (5) With period T b (Period T b Less than period T a ) performs the i+1th round of inspection to detect the luminous efficiency K of each fluorescent lamp, and returns to step (4).

[0082] The judgment condition of step (3) may also be that the use efficiency of the fluorescent lamp is greater than 90%, where the use efficiency of the fluorescent lamp is the percentage of the use time of the fluorescent lamp to the factory life of the fluorescent lamp. That is, if either of "the luminous efficiency of the fluorescent lamp is less than threshold I" and "the use efficiency of the fluorescent lamp is greater than 90%" is met, the process proceeds to step (4);

[0083] The judgment condition of step (4) can also be that the utilization efficiency of the fluorescent lamp is equal to 100%, that is, if any one of "the luminous efficiency of the fluorescent lamp K is less than or equal to threshold II" and "the utilization efficiency of the fluorescent lamp is equal to 100%" is met, the fluorescent lamp is replaced and the process returns to step (1).

Claims

1. A method for detecting the luminous efficiency of a fluorescent lamp, characterized in that: Using the same test conditions, the current illuminance value X and the illuminance value A at the same position of the fluorescent lamp when not in use are respectively tested, and the luminous efficiency K of the fluorescent lamp is calculated by the formula K=X / A×100%; The test method of illuminance value is: when the fluorescent lamp is powered off, a specific ultraviolet light is used to irradiate the fluorescent lamp to excite the phosphor, and the visible light emitted by the phosphor after being excited is detected to generate the illuminance value; The specific ultraviolet rays have two characteristic wavelengths of 165 nm and 274 nm, and each includes an interval centered on each characteristic wavelength and having an interval of ±20 nm; The angle between the incident ultraviolet rays and the visible light emitted by the fluorescent powder after being excited is less than 45 degrees.

2. The method for detecting the luminous efficiency of a fluorescent lamp according to claim 1, characterized in that: The specific UV irradiation position is the electrode end of the fluorescent tube.

3. A fluorescent lamp luminous efficiency detection device using the fluorescent lamp luminous efficiency detection method as claimed in claim 1 or 2, characterized in that: It is mainly composed of ultraviolet light emitting device, light intensity sensor and data processing module; The ultraviolet light emitting device is used to emit the specific ultraviolet light; The light intensity sensor is detachably fixed on the grid just below the electrode end of the fluorescent tube, and the distance between the light intensity sensor and the electrode end of the fluorescent tube is 10mm or 20mm; the parameters of the light intensity sensor are: wavelength measurement range 380~730nm, accuracy ±7%, repeated test ±5%, temperature characteristic ±0.5% / ℃, measurement range 0~200000Lux; the light intensity sensor is used to detect the visible light emitted by the fluorescent powder after being excited, generate the light intensity value, and send it to the data processing module; The data processing module is used to store the illuminance value and calculate the luminous efficiency of the fluorescent lamp.

4. The fluorescent lamp luminous efficiency detection device according to claim 3, characterized in that: It also includes a data transmission module, which is used to transmit the luminous efficiency of the fluorescent lamp obtained by the data processing module to a receiving device.

5. The fluorescent lamp luminous efficiency detection device according to claim 3, characterized in that: The ultraviolet light emitting device is detachably fixed on the grid just below the electrode end of the fluorescent tube, and the distance between the ultraviolet light emitting device and the electrode end of the fluorescent tube is 10 mm or 20 mm.

6. A method for monitoring a fluorescent lamp, characterized by: With period T a Detect the luminous efficiency of the fluorescent lamp, and when the luminous efficiency of the fluorescent lamp is less than threshold I and greater than threshold II, b Continue to test, and when the luminous efficiency of the fluorescent lamp is less than or equal to the threshold II, replace the fluorescent lamp with a period of T a Continue testing; Wherein, the luminous efficiency of the fluorescent lamp is measured by the detection method of the luminous efficiency of the fluorescent lamp according to claim 1 or 2; Threshold I is obtained by taking the average value after detecting the luminous efficiency of multiple fluorescent lamps that are manually determined to have early failure characteristics, and threshold II is obtained by taking the average value after detecting the luminous efficiency of multiple fluorescent lamps that are manually determined to have early failure characteristics. The early failure characteristics are that the lighting effect can meet the use requirements but is not ideal, and the failure characteristics are that the lighting effect cannot meet the use requirements. Period T a Greater than period T b .

7. The fluorescent lamp monitoring method according to claim 6, characterized in that: If there are more than one fluorescent lamp, the specific monitoring process is as follows: (1) Detecting the illuminance value A of the fluorescent lamp when it is not in use, storing the lamp tube address and illuminance value A of the fluorescent lamp in the initial database, and setting i=1; (2) With period T a Conduct the i-th round of inspection to detect the luminous efficiency K of the fluorescent lamp; (3) Determine whether the luminous efficiency K of the fluorescent lamp is less than the threshold I. If so, proceed to the next step; Otherwise, the time stamp, lamp address and luminous efficiency K of the fluorescent lamp are stored in the inspection database. The lamp address of the same fluorescent lamp in the inspection database is the same as that in the initial database. Let i=i+1 and return to step (2). (4) determining whether the luminous efficiency K of the fluorescent lamp is less than or equal to the threshold II; if so, replacing the fluorescent lamp and returning to step (1); the lamp tube address of the fluorescent lamp before and after the replacement is the same; otherwise, storing the time stamp, lamp tube address and luminous efficiency K of the fluorescent lamp in the monitoring database; the lamp tube address of the same fluorescent lamp in the monitoring database is the same as that in the initial database; (5) With period T b Perform the (i+1)th round of inspection to detect the luminous efficiency K of each fluorescent lamp, and return to step (4).

8. The fluorescent lamp monitoring method according to claim 6, characterized in that: Threshold I and threshold II are 85% and 70%, respectively.

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