Light interference test platform and method based on linear light beam smoke-sensing fire detector

Abstract

A light interference test platform based on a linear light beam smoke-sensitive fire detector comprises a detector system, and a central axis of a detection light path is formed between a transmitting end and a receiving end; the high-precision movable platform comprises a walking mechanism used for moving along the ground, a lifting mechanism used for adjusting the vertical height and a rotating mechanism used for adjusting the irradiation angle, and the rotating mechanism is provided with a clamp used for fixing the interference light source; a probe of the optical measurement system is arranged on the light receiving surface of the receiving end; the moving path of the walking mechanism is limited on a preset track line, the track line is parallel to the central axis of the detection light path, and a preset lateral distance is kept between the track line and the detection light path in the horizontal direction, so that it is ensured that the interference light source and the high-precision movable platform are located outside a light beam cone of the detection light path all the time in the moving and irradiating process. The invention also provides a light interference test method of the linear light beam smoke-sensitive fire detector. The purity of the test result is ensured, and the obtained data is real light interference response.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of fire safety and fire detection technology, and in particular, relates to a light interference test platform and test method for a linear-beam smoke fire detector. BACKGROUND

[0002] The linear-beam smoke fire detector (hereinafter referred to as "detector") works through the light beam path formed between the emission end and the receiving end. When the smoke particles generated by the fire enter the light path, causing the light intensity received by the receiving end to attenuate to a preset threshold, the detector will issue a fire alarm signal. Due to its large protection area, economy, and relatively simple maintenance, it is widely used in high and large space places such as large warehouses, sports venues, exhibition centers, and aircraft hangars.

[0003] However, in such places, the environmental light is complex and variable. On the one hand, high-intensity lighting equipment such as metal halide lamps, high-pressure sodium lamps, and high-power LED projectors may directly or indirectly enter the receiving end of the detector, causing interference. On the other hand, dynamic or transient strong light generated by stage lighting, laser performance, and vehicle movement may also affect the normal operation of the detector. These light interferences may cause false alarms of the detector, reducing the reliability of the system; or in some cases, strong light may saturate the automatic gain control (AGC) circuit inside the detector, thereby reducing its detection sensitivity to real smoke and causing a risk of missed alarms.

[0004] Currently, there is still a lack of unified, standardized, and quantifiable test methods and special devices for anti-light interference testing of linear-beam detectors in the industry. The existing tests often use simple handheld light sources for irradiation, which has the following defects: It is difficult to avoid physical obstruction: during the irradiation of the receiver, the interference light source or the operator himself may easily partially or completely obstruct the infrared light path of the detector. This physical obstruction will directly trigger an alarm, making it impossible to distinguish between light interference and physical obstruction, resulting in invalid test results.

[0005] Poor repeatability: the position, angle, distance, and irradiation method of the interference light source completely depend on manual operation, which is difficult to accurately control and reproduce, resulting in non-comparability of results between different tests and different laboratories.

[0006] Lack of quantitative analysis: traditional tests only focus on whether the alarm is triggered, without simultaneously measuring and recording the critical optical parameters (such as illuminance, spectral composition, and color temperature) that cause the impact, making it impossible to establish a quantitative relationship between the interference phenomenon and the optical data, which is not conducive to product improvement and standard development.

[0007] Incomplete coverage of light source types: It fails to fully cover all types of static, dynamic and special light sources commonly used in modern lighting technology, and the test scenario is out of touch with the actual application scenario.

[0008] Therefore, there is an urgent need to develop a standardized, repeatable, and quantifiable test platform and method to evaluate the anti-light interference performance of linear beam smoke detectors, so as to scientifically and accurately evaluate product performance and promote technological progress in the industry. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a light interference test platform and test method based on a linear beam smoke detector, which can effectively avoid physical obstruction interference. The method has a standardized process and can accurately and repeatably quantitatively evaluate the influence of various interference light sources on the detector under different conditions.

[0010] To address the aforementioned technical problems, this invention provides a light interference testing platform based on a linear beam smoke detector, comprising: The detector system includes a transmitter 1 and a receiver 2, wherein a central axis 10 of a detection optical path is formed between the transmitter 1 and the receiver 2; 3 interfering light sources; A high-precision movable platform 4 is used to carry and position the interference light source 3. The high-precision movable platform 4 includes a walking mechanism 41 for moving along the ground, a lifting mechanism 42 for adjusting the vertical height, and a rotating mechanism 43 for adjusting the illumination angle. The rotating mechanism 43 is provided with a clamp for fixing the interference light source 3. An optical measurement system, wherein the probe 6 is disposed on the light-receiving surface of the receiver 2; The movement path of the walking mechanism 41 is limited to a preset trajectory line 5, which is parallel to the central axis 10 of the detection optical path and maintains a preset lateral distance from it in the horizontal direction, so as to ensure that the interference light source 3 and the high-precision movable platform 4 are always outside the beam cone of the detection optical path during the movement and illumination process.

[0011] Preferably, the preset lateral distance is 300mm.

[0012] Preferably, the lifting mechanism 42 can position the interference light source 3 at at least three preset vertical height positions, including: a middle position at the same height as the central axis 10 of the detection optical path, a low position below the central axis 10, and a high position above the central axis 10.

[0013] Preferably, the low position is 300mm below the vertical distance of the central axis 10 of the detection optical path; the high position is 300mm above the vertical distance of the central axis 10 of the detection optical path.

[0014] Preferably, the interference light source 3 is one of a static lighting source, a dynamic lighting source, or a special light source; The static lighting source is one or more of the following: LED lamp, metal halide lamp, high-pressure sodium lamp, spotlight, supplementary light, and floodlight; The dynamic lighting source is one or more of the following: magic ball flash, strobe light, laser light, and beam light; The special light source is a vehicle headlight.

[0015] A method for testing optical interference in a linear beam smoke detector, characterized by employing the optical interference testing platform described above, and comprising the following steps: S1: Calibrate the detector system to normal monitoring state and fix the interference light source 3 to be tested on the high-precision movable platform 4; S2: Control the walking mechanism 41 of the high-precision movable platform 4 to move along the trajectory line 5 to at least one preset distance point, and adjust the interference light source 3 to a preset illumination angle through its rotation mechanism 43 and lifting mechanism 42 to illuminate the receiving end 2. S3: During the illumination process, record the state of the detector system, and simultaneously use the optical measurement system to measure and record the optical parameters at the light-receiving surface of the receiver 2.

[0016] Preferably, the preset distance points in S2 include positions 10 meters, 5 meters, and 1 meter away from the receiving end 2.

[0017] Preferably, the preset illumination angle in S2 is formed by combining different vertical heights and beam directions, including: Low-position incidence: The interference light source 3 is positioned at a low position below the central axis 10 of the detection optical path and is aligned with the center of the receiver 2; Center-position incidence: The interference light source 3 is positioned at the same height as the central axis 10 of the detection optical path and is aligned with the center of the receiver 2; High-position incidence: The interference light source 3 is positioned at a high position above the central axis 10 of the detection optical path and is aligned with the center of the receiver 2; High-position vertical incidence: The interference light source 3 is positioned at a high position above the central axis 10 of the detection optical path, and the beam shines vertically downwards onto the central axis 10 of the detection optical path.

[0018] Preferably, the step of irradiating the receiver 2 includes different irradiation modes depending on the type of the interfering light source 3; When the interfering light source is a static lighting source, the illumination modes include flickering illumination and continuous stable illumination; When the interfering light source is a dynamic lighting source, the illumination mode is its built-in dynamic operation mode; When the interfering light source is a special light source, the illumination modes include high-frequency flickering illumination and continuous stable illumination.

[0019] Preferably, the detector system status recorded in S3 includes alarms, faults, or changes in response thresholds; the measured optical parameters include illuminance, color temperature, and spectral distribution.

[0020] In summary, this invention provides a light interference test platform and test method based on a linear beam smoke detector. The light interference test platform has a scientifically designed structure that can effectively avoid physical obstruction interference. The method has a standardized process and can accurately and repeatably quantitatively evaluate the impact of various interference light sources on the detector under different conditions.

[0021] Compared with the prior art, the present invention has the following advantages: By innovatively employing a "lateral parallel trajectory" arrangement of interference sources, it is ensured that the interference light source and its supporting platform will not enter the detector's effective optical path at any test position, thus guaranteeing the purity of the test results. All data obtained represent genuine optical interference responses. Fixed trajectory lines, clearly defined distance points, preset illumination angle combinations, and standardized illumination procedures ensure precise and controllable testing processes, guaranteeing high consistency and repeatability of test results, providing a reliable basis for product comparison and certification. Directly correlating the detector response with synchronously measured key optical parameters such as illuminance, color temperature, and spectrum provides precise data support for optimizing detector anti-interference algorithms and designing optical filtering devices. Covering various common and special light sources, including static, dynamic, and vehicle-moving light sources, simulates a wide range of real-world application scenarios, making the test results more practically instructive and enabling a more comprehensive evaluation of the detector's adaptability in complex lighting environments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall layout of a light interference test platform based on a linear beam smoke detector, provided as an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of the high-precision movable platform in an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram illustrating the definition of the illumination angle of the interference light source in an embodiment of the present invention.

[0025] Figure 4 A flowchart of the test method provided in an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached diagram: 1-Transmitter; 2-Receiver; 3-Interference light source; 4-High-precision movable platform; 5-Trajectory line; 6-Spectrum analyzer probe; 10-Central axis of the detection optical path; 41-Walking mechanism (universal wheel); 42-Lifting mechanism; 43-Rotation mechanism (angle disc); α-Horizontal angle; β-Vertical angle. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the embodiments of this invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other. To better understand this invention, it will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figure 1 This invention discloses a light interference quantification simulation test platform based on a linear beam smoke detector. The light interference quantification simulation test platform is deployed in a dark room with a length of not less than 10 meters, a width of not less than 3 meters, and a height of not less than 3 meters. Before the test, the background illuminance is ensured to be below 100 lx.

[0029] The optical interference quantification simulation test platform of this embodiment includes a detector system, which consists of at least one set of linear beam smoke detectors, including a transmitter 1 and a receiver 2. In this embodiment, multiple sets of three detector systems, such as detector systems of different brands (labeled A, B, and C), can be installed sequentially for comparative evaluation. The transmitter 1 and receiver 2 are installed 10 meters apart, and through precise calibration, a stable detection optical path central axis 10 is formed between them, confirming that all detectors are in normal monitoring condition.

[0030] The optical interference quantification simulation test platform of this embodiment also includes an interference light source system. In this embodiment, various types of interference light sources 3 are prepared, including: Static light sources: LED panel lights, 250W / 400W metal halide lamps, 250W / 400W high-pressure sodium lamps, etc.

[0031] Dynamic light sources: karaoke room magic ball flashlights, strobe lights, 300mV / 500mV laser lights, etc.

[0032] Special light source: A set of automotive lights including low beam, high beam, fog lights, and brake lights.

[0033] The core of the optical interference quantification simulation test platform in this embodiment is a high-precision movable platform 4, such as... Figure 2As shown. This high-precision movable platform 4 is used to support the interference light source 3. The bottom of the platform is equipped with a walking mechanism 41 with brakes (such as casters). The main body of the high-precision movable platform 4 is a lifting mechanism 42, which can adjust the platform height between 0.5 meters and 3.0 meters. The top of the platform is a rotating mechanism 43, whose surface has an angle plate and is equipped with clamps for fixing the interference light source 3. This rotating mechanism 43 can realize the pitch and yaw adjustment of the light source.

[0034] Crucially, a trajectory line 5 is laid out on the ground of the test site, parallel to the central axis 10 of the detection optical path. The horizontal lateral distance between this trajectory line 5 and the central axis 10 is always 300mm. The walking mechanism 41 of the high-precision movable platform 4 always moves along this trajectory line 5. This design ensures that the platform 4 and any interfering light source 3 carried on it will not physically enter the beam cone formed by the transmitting end 1 and the receiving end 2 throughout the entire test, thus completely eliminating the interference of physical obstruction on the test results.

[0035] The optical interference quantification simulation test platform of this embodiment also includes an optical measurement system, which is a multi-functional spectrometer. Its probe 6 is designed to be precisely placed or closely attached to the center of the light-receiving surface of the receiver 2 during the test, for real-time measurement and recording of data such as illuminance (lx), color temperature (K) and dominant wavelength of the spectrum (nm) at that point.

[0036] Based on the aforementioned optical interference quantification simulation test platform, this embodiment of the invention provides a standardized optical interference test method, the process of which is as follows: Figure 4 As shown, the specific steps are as follows: Step S1: Experiment preparation.

[0037] Set the sensitivity of all three detector systems (brands A, B, and C) to the highest level specified by the manufacturer. Lay out a trajectory line 5 on the ground, 300mm away from the central axis 10 of the detector's optical path. Check that all interfering light sources under test are functioning correctly and number them.

[0038] Step S2: Perform a static light source interference test.

[0039] Taking the test of a "400W metal halide lamp" as an example: Distance Interference Test: Move the high-precision movable platform 4 equipped with metal halide lamps to a position 10 meters away from receiver 2 on track line 5. Adjust the light source angle so that its beam is precisely aligned with the center area of ​​the three receivers. First, perform a flashing illumination cycle of "power on for 2 seconds, power off for 2 seconds" five times, observing and recording the status of the three detectors A, B, and C (whether an alarm or fault report occurs). Then, keep the metal halide lamps lit for 5 minutes, observing and recording the status again. During this period, place the spectral analyzer probe 6 at the center of the receivers and measure and record optical parameters such as illuminance and color temperature.

[0040] Move platform 4 to positions 5 meters and 1 meter away from the receiver in sequence, and repeat the above irradiation and measurement steps.

[0041] Step S3: Perform angle interference test.

[0042] The high-precision movable platform 4 is placed on the trajectory line 5 at a distance of 2 meters from the receiver 2. (Refer to...) Figure 3 By adjusting the lifting mechanism 42 and the rotating mechanism 43 of the platform, the interference light source 3 is positioned at the following four standard angle positions for irradiation: Position I: The platform height is 300mm below the vertical distance of the center axis of the detection optical path, and the light source is aligned with the center of the receiver (low-position incidence).

[0043] Position II: The platform height is aligned with the central axis 10 of the detection optical path, and the light source is aligned with the center of the receiver (central incidence).

[0044] Position III: The platform height is 10 mm higher than the center axis of the detection optical path and 300 mm vertically, with the light source aligned with the center of the receiver (high-position incidence).

[0045] Position IV: The platform height is 10 mm higher than the central axis of the detection optical path, with a vertical distance of 300 mm. The light source beam is vertically downward and aligned with the central axis of the detection optical path (high-position vertical incidence).

[0046] At each angular position, the scintillation illumination, continuous illumination, and optical parameter measurement in step S102 are repeated.

[0047] Step S4: Perform dynamic and special light source tests.

[0048] For dynamic light sources, place them at positions I-IV in step 103 at locations such as 10 meters and 5 meters, turn on the power and let them rotate for 5 minutes according to their built-in program, and record the detector status and the changes in optical parameters.

[0049] For special light sources, simulate a vehicle approaching from the side, placing them at positions I-IV at 10 meters, 5 meters, and 1 meter, and performing 10 flashes of "power on for 1 second, power off for 1 second", followed by continuous illumination for 3 minutes, recording the detector status and optical parameters.

[0050] Step S5: Data preparation and analysis.

[0051] All test data were entered into the pre-set "Test Raw Data Recording Table." Analysis of this table clearly shows which detector experienced false alarms or performance degradation, based on factors such as light source type, distance, angle, light intensity, and spectral information. For example, it might be found that detector A would alarm when illuminated by a 6500K LED light source at a distance of 1 meter and position I, with an illuminance exceeding 5000 lx, while detector B would perform stably under the same conditions. These quantitative results provide direct evidence for evaluating product quality and for technological improvements.

[0052] In summary, this invention, through its unique platform design and standardized methodology, successfully solves the key technical challenges in optical interference testing of linear beam detectors, providing a scientific, reliable, and efficient testing solution for this field.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0054] The above are merely preferred embodiments of the present invention. Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A light interference test platform for a linear beam smoke fire detector, characterized in that, It comprises: a detector system, including a transmitting end (1) and a receiving end (2), the transmitting end (1) and the receiving end (2) form a central axis (10) of the detection light path; an interference light source (3); a high-precision movable platform (4) for carrying and positioning the interference light source (3), which includes a walking mechanism (41) for moving along the ground, a lifting mechanism (42) for adjusting the vertical height, and a rotating mechanism (43) for adjusting the irradiation angle, and the rotating mechanism (43) is provided with a clamp for fixing the interference light source (3); an optical measurement system, whose probe (6) is arranged on the light receiving surface of the receiving end (2); The moving path of the walking mechanism (41) is limited on a preset trajectory line (5), which is parallel to the central axis (10) of the detection light path and maintains a preset lateral distance with it in the horizontal direction, so as to ensure that the interference light source (3) and the high-precision movable platform (4) itself are always located outside the beam cone of the detection light path during movement and irradiation.

2. The light interference test platform according to claim 1, wherein: The preset lateral distance is 300 mm.

3. The light interference test platform according to claim 1, wherein: The lifting mechanism (42) can position the interference light source (3) at least at three preset vertical height positions, including an intermediate position equal in height to the central axis (10) of the detection light path, a low position lower than the central axis (10), and a high position higher than the central axis (10).

4. The light interference test platform according to claim 3, wherein: The low position is 300 mm below the central axis (10) of the detection light path vertically; the high position is 300 mm above the central axis (10) of the detection light path vertically.

5. The light interference test platform of claim 1, wherein: The interference light source (3) is one of a static lighting source, a dynamic lighting source or a special light source; The static lighting source is one or more of LED lamp, metal halide lamp, high-pressure sodium lamp, spotlight, fill light, projection lamp; The dynamic lighting source is one or more of magic ball flash lamp, stroboscopic lamp, laser lamp, beam lamp; The special light source is a motor vehicle lamp.

6. A method of testing a linear beam optical smoke fire detector for optical interference, characterized by, The light interference test platform according to any one of claims 1 to 5 comprises the following steps: S1: calibrate the detector system to a normal monitoring state, and fix the interference light source (3) to be tested on the high-precision movable platform (4); S2: control the walking mechanism (41) of the high-precision movable platform (4) to move along the trajectory line (5) to at least one preset distance point, and adjust the interference light source (3) to a preset irradiation angle through the rotating mechanism (43) and the lifting mechanism (42), so as to irradiate the receiving end (2); S3: record the state of the detector system during irradiation, and simultaneously measure and record the optical parameters at the light receiving surface of the receiving end (2) using the optical measurement system.

7. The light interference test method according to claim 6, wherein: the preset distance points in S2 include positions 10 meters, 5 meters and 1 meter away from the receiving end (2).

8. The light interference test method according to claim 6, wherein: the preset irradiation angles in S2 are formed by combining different vertical heights and light beam directions, including: low-position incidence: the interference light source (3) is at a low position lower than the central axis (10) of the detection light path and is aligned with the center of the receiving end (2); mid-position incidence: the interference light source (3) is at a mid position at the same height as the central axis (10) of the detection light path and is aligned with the center of the receiving end (2); high-position incidence: the interference light source (3) is at a high position higher than the central axis (10) of the detection light path and is aligned with the center of the receiving end (2); high-position vertical incidence: the interference light source (3) is at a high position higher than the central axis (10) of the detection light path and the light beam is vertically downward to the central axis (10) of the detection light path.

9. The method of claim 6, wherein: The step of irradiating the receiving end (2) adopts different irradiation modes according to the type of the interference light source (3), including: when the interference light source is a static lighting light source, the irradiation mode includes flickering irradiation and continuous stable irradiation; when the interference light source is a dynamic lighting light source, the irradiation mode is the dynamic operation mode provided by the light source itself; when the interference light source is a special light source, the irradiation mode includes high-frequency flickering irradiation and continuous stable irradiation.

10. The method according to claim 6, wherein: the recorded detector system states in S3 include alarm, failure or response threshold change; and the measured optical parameters include illuminance, color temperature and spectral distribution.

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