Equivalent detection method for infrared communication distance

Abstract

The invention discloses an equivalent detection method for an infrared communication distance, which comprises the following steps of: respectively quantifying a transmitting distance and a receiving distance through an independent dual-channel design, and realizing accurate distance simulation under spatial free arrangement by combining optical fiber transmission and a programmable attenuation unit; according to the method, the limitation of the traditional physical distance is broken through, the actual communication distance measurement is converted into controllable optical parameter adjustment, and an efficient and accurate test means is provided for infrared communication equipment. In addition, a special condenser structure is adopted to reduce optical path loss, the test accuracy is ensured through fixed attenuation value compensation, and the device is suitable for the whole process of research and development, production and quality inspection.

Description

Technical Field

[0001] This invention relates to the field of infrared communication testing technology, and in particular to an equivalent detection method for infrared communication distance based on optical fiber transmission and programmable attenuation. Background Technology

[0002] In existing technologies, infrared communication distance is one of the key indicators for evaluating the performance of infrared communication devices. Currently, the industry commonly uses actual distance testing, which involves placing the infrared communication device under test and the infrared device detection unit in actual space for direct head-on testing to determine its maximum effective communication distance.

[0003] However, this traditional testing method has several significant drawbacks: First, the test device and the detection device must be placed directly opposite each other during the test, and there must be no physical obstruction in the test optical path; otherwise, the accuracy of the test results will be seriously affected. Second, the test results are easily affected by the deviation of the beam angle and changes in ambient lighting conditions, resulting in poor repeatability and low comparability of the test data. In addition, in order to complete long-distance testing, it is often necessary to carry out the test in an open area, which not only occupies a large test space but also increases the complexity of the test environment setup and the difficulty of test implementation, resulting in low test efficiency and difficulty in meeting the needs of large-scale and standardized testing.

[0004] Therefore, how to provide a more efficient, stable, and less susceptible-to-environmental-interference-dependent infrared communication distance testing method has become a pressing technical problem to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems by proposing an equivalent detection method for infrared communication distance. This method utilizes an independent dual-channel design to quantify the transmission and reception distances separately, leverages fiber optic transmission channels for flexible spatial arrangement, and combines a programmable attenuation unit to dynamically simulate transmission loss at different communication distances. This method overcomes the limitations of traditional physical distances, transforming the measurement of actual communication distance into controllable optical parameter adjustment, providing an efficient and accurate testing method for the research, development, production, and quality inspection of infrared communication equipment.

[0006] The technical solution of this invention is:

[0007] This invention provides an equivalent detection method for infrared communication distance, which employs an independent dual-channel detection method, wherein;

[0008] Channel 1 is used to detect the transmission distance of the infrared communication device under test. The infrared signal emitted by the infrared communication device under test is coupled to the optical fiber transmission channel through the infrared signal acquisition unit, and then attenuated by the programmable optical attenuation unit to simulate transmission loss before being transmitted to the infrared signal detection unit.

[0009] Channel 2 is used to detect the receiving distance of the infrared communication device under test. The standard test signal emitted by the infrared signal detection unit is transmitted to the receiving end of the infrared communication device under test through the optical fiber transmission channel. The attenuation value of the programmable optical attenuation unit is adjusted to simulate the transmission loss, and quantitative analysis is performed to calculate the receiving distance.

[0010] Furthermore, the infrared signal acquisition unit adopts a condenser lens structure with a threaded interface. The condenser lens structure converts the divergent infrared light emitted by the infrared communication device under test into a parallel beam output. The output end of the lens and the input end of the optical fiber transmission channel are physically coupled through a threaded interface. The infrared signal is coupled to the optical fiber transmission channel through the mechanical alignment of the threaded interface.

[0011] Furthermore, physical and mechanical coupling is achieved through the SMA905 threaded interface, with a repeatability accuracy of ±0.02mm; the condenser lens structure collimates the ±15° divergent light into a ±0.5° parallel beam, achieving a 99% light energy collection efficiency in the 840nm band, with an insertion loss ≤0.5dB.

[0012] Furthermore, the optical fiber transmission channel is composed of optical fibers and programmable optical attenuation units;

[0013] The optical fiber has arbitrary bending characteristics, ensuring that the relative position of the infrared communication device under test and the infrared signal detection unit is not limited by space.

[0014] The programmable optical attenuation unit is embedded in the middle of the optical fiber. By adjusting the attenuation value of the programmable optical attenuation unit, the transmission loss of infrared signals at different communication distances can be simulated.

[0015] Furthermore, the fixed attenuation value Pm is formed by the superposition of the inherent deviation of the infrared signal acquisition unit during the signal conversion process, the optical fiber propagation loss, and the connector loss. The optical fiber propagation loss originates from material absorption and Rayleigh scattering effects, and the connector loss originates from mechanical alignment errors and interface reflection losses.

[0016] Furthermore, the transmission distance of the infrared communication device under test detected by channel one includes:

[0017] The programmable optical attenuation unit is set to attenuation value of zero. The infrared communication device under test sends an infrared signal to the receiving end of the infrared signal detection unit through the optical fiber transmission channel. After verifying that the communication success rate is 100%, the attenuation value of the programmable optical attenuation unit is gradually increased in a preset step. The communication success rate is monitored in real time until the communication success rate drops below the preset threshold. The critical attenuation value P1 is recorded.

[0018] The transmission distance L1 = (P1 + Pm) / a is determined based on the critical attenuation value P1 and the fixed attenuation value Pm, wherein the optical attenuation coefficient a is the correlation coefficient between the increased attenuation value and the communication distance.

[0019] Furthermore, the receiving distance of the infrared communication device under test detected by channel two includes:

[0020] The programmable optical attenuation unit is set to attenuation value of zero. The transmitter of the infrared signal detection unit sends a standard test signal to the infrared communication device under test through the optical fiber transmission channel. After verifying that the communication success rate is 100%, the attenuation value of the programmable optical attenuation unit is gradually increased in a preset step. The communication success rate is monitored in real time until the communication success rate drops below the preset threshold. The critical attenuation value P2 is recorded.

[0021] The receiving distance L2 = (P2 + Pm) / a is determined based on the critical attenuation value P2 and the fixed attenuation value Pm, wherein the optical attenuation coefficient a characterizes the relationship between the transmission loss and the distance.

[0022] Furthermore, the preset threshold for the communication success rate is 95-99%; the preset step is 0.1dB.

[0023] Furthermore, if the communication success rate is less than 100%, the transmission distance L1 and the reception distance L2 are determined based on a fixed attenuation value Pm; in this case, L1 = Pm / a, L2 = Pm / a.

[0024] The beneficial effects of this invention are:

[0025] This invention discloses an equivalent detection method for infrared communication distance. Through a unique dual-channel detection method, the transmission and reception distances are detected separately. The transmission loss at different distances is simulated by using an optical fiber transmission channel and a programmable optical attenuation unit. By gradually increasing the attenuation value until the communication success rate decreases, the critical attenuation value is accurately recorded. The communication distance is calculated by combining the fixed attenuation and the optical attenuation coefficient. This method achieves efficient and accurate detection of infrared communication distance, breaking through the spatial limitations and testing error problems of traditional methods.

[0026] This invention optimizes optical path coupling efficiency through a condenser lens structure, ensuring signal acquisition accuracy. At the same time, it achieves quantitative analysis through high-precision attenuation adjustment, providing reliable technical support for equipment performance evaluation and significantly improving the practicality and accuracy of detection.

[0027] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0028] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0029] Figure 1 This is a schematic diagram of the condenser lens structure of the present invention.

[0030] Figure 2 This is a flowchart of the infrared emission distance detection process for the infrared communication device under test according to the present invention.

[0031] Figure 3 This is a flowchart of the infrared receiving distance detection process for the infrared communication device under test according to the present invention. Detailed Implementation

[0032] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0033] This invention provides an equivalent detection method for infrared communication distance, which employs an independent dual-channel detection method, wherein;

[0034] Channel 1 is used to detect the transmission distance of the infrared communication device under test. The infrared signal emitted by the infrared communication device under test is coupled to the optical fiber transmission channel through the infrared signal acquisition unit, and then attenuated by the programmable optical attenuation unit to simulate transmission loss before being transmitted to the infrared signal detection unit.

[0035] Channel 2 is used to detect the receiving distance of the infrared communication device under test. The standard test signal emitted by the infrared signal detection unit is transmitted to the receiving end of the infrared communication device under test through the optical fiber transmission channel. The attenuation value of the programmable optical attenuation unit is adjusted to simulate the transmission loss, and quantitative analysis is performed to calculate the receiving distance.

[0036] The programmable light attenuation unit is set to attenuation value of zero to verify that the communication success rate between the infrared signal detection unit and the infrared communication device under test is 100%. The attenuation value of the programmable light attenuation unit is gradually increased until the communication success rate drops below the preset threshold. The critical attenuation value P1 of channel one and the critical attenuation value P2 of channel two are recorded respectively.

[0037] The transmission distance L1 and the receiving distance L2 are calculated based on the critical attenuation values ​​P1 and P2, respectively. The transmission distance L1 = (P1 + Pm) / a and the receiving distance L2 = (P2 + Pm) / a, where Pm is a fixed attenuation value and a is the optical attenuation coefficient.

[0038] In one embodiment, for detecting the transmission distance of the infrared communication device under test, an infrared signal acquisition unit acquires the infrared signal emitted by the device under test and couples it to an optical fiber transmission channel. This acquisition unit typically employs a condenser lens structure to convert divergent infrared light into a parallel beam, thereby reducing optical path loss, improving the accuracy of signal acquisition, ensuring more light energy enters the channel, and avoiding signal loss due to angle deviations in traditional methods. Subsequently, a programmable optical attenuation unit adjusts the signal attenuation to simulate transmission loss at different distances, and finally transmits it to a detection unit for quantization processing to obtain attenuation data records of the transmitted signal. The adjustment process of this invention is beneficial for accurately reproducing actual communication scenarios in a laboratory environment and improving testing efficiency.

[0039] Specifically, regarding the attenuation data recording of the aforementioned transmitted signal, the signal quality is monitored in real time in the detection unit. By gradually adjusting the attenuation value of the programmable optical attenuation unit, the critical attenuation data when the communication success rate drops from 100% to a preset threshold is recorded, thereby obtaining the transmission limit of the device and improving the accuracy of the detection.

[0040] In one embodiment, for detecting the receiving distance of the infrared communication device under test, a standard test signal emitted by the detection unit is transmitted to the receiving end of the device under test through an optical fiber transmission channel. By adjusting the attenuation value of the programmable optical attenuation unit to simulate transmission loss, the signal change at the receiving end is obtained, and the critical attenuation data when the success rate drops to a preset threshold is recorded. This dual-channel separation design is beneficial for independently quantifying the receiving capability, simulating real loss without the need for physical distance adjustment, and improving the flexibility of the test.

[0041] Specifically, for the critical attenuation data of the above-mentioned transmission and reception, the two sets of data are converted into equivalent transmission distance and reception distance respectively by using the pre-established correspondence between attenuation and distance, thereby completing the equivalent detection of infrared communication distance. This invention transforms optical parameters into distance indicators and improves the quality control of infrared devices.

[0042] In practice:

[0043] like Figure 1-3 As shown, this invention relates to an equivalent detection method for infrared communication distance, firstly by setting up the detection environment. Please refer to [link / reference]. Figure 1 The diagram shows the infrared signal acquisition unit, which, together with the optical fiber and programmable attenuation unit, forms the infrared signal transmission channel. The programmable attenuation unit has a range of 0–60 dB and an adjustment step of 0.1 dB. Please refer to [link / reference]. Figure 2 and Figure 3 A dual-channel communication link is established to detect the transmission and reception distances of the infrared devices respectively.

[0044] The next step is to calibrate the established environment. Measurements are taken using an optical power meter. With the programmable attenuation unit set to 0dB, the inherent loss of the infrared signal transmission signal from the tested infrared device after passing through the infrared signal transmission channel is ensured to meet the theoretical value of 1.5dB by fine-tuning the light angle of the infrared signal acquisition unit and the alignment error of the connector.

[0045] The transmission distance of the infrared signal under test was then measured. With the programmable attenuator set to 0dB, the initial communication success rate of the infrared signal was verified to be 100%. The attenuation value was gradually increased in 0.1dB increments, and the communication status was monitored in real time. The attenuation value P1 when the communication success rate first dropped below 99% was recorded. The experimentally measured P1 was 15.2dB.

[0046] Next, the emission distance calculated from the detection environment was compared and verified with the emission distance from the actual distance test. Multiple experiments showed that the infrared light attenuation coefficient α was 0.54, and the emission distance L was calculated accordingly. 发射 = (15.2 + 1.5) / 0.54 = 30.9m. A distance test was conducted in an open environment with a light intensity of (187–212) Lx, and the final test result was 30.5m. The error between the test result and the actual communication performance is (30.9 - 30.5) / 30.5 = 1.3%.

[0047] The receiving distance of the infrared signal under test was then tested. With the programmable attenuator set to 0dB, the initial communication success rate of the infrared signal was verified to be 100%. The attenuation value was gradually increased in 0.1dB increments, and the communication status was monitored in real time. The attenuation value P2 when the communication success rate first dropped below 99% was recorded. The experimentally measured P2 was 13.8dB.

[0048] Next, the receiving distance calculated from the test environment will be compared and verified with the receiving distance from the actual distance test. The receiving distance L will be calculated based on the experimental results. 接收 = (13.8 + 1.5)

[0049] / 0.54 = 28.3m. A distance test was conducted in an open environment with a light intensity of (187~212) Lx, and the final test result was 27.7m. The error between the test result and the actual communication performance is (28.3-27.7) / 27.7 = 2.2%.

[0050] In summary, the test results show an error of less than ±5% compared to the actual communication performance test, verifying the effectiveness of the present invention.

[0051] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An equivalent detection method for infrared communication distance, characterized in that, This method employs an independent dual-channel detection approach, wherein; Channel 1 is used to detect the transmission distance of the infrared communication device under test. The infrared signal emitted by the infrared communication device under test is coupled to the optical fiber transmission channel through the infrared signal acquisition unit, and then attenuated by the programmable optical attenuation unit to simulate transmission loss before being transmitted to the infrared signal detection unit. Channel 2 is used to detect the receiving distance of the infrared communication device under test. The standard test signal emitted by the infrared signal detection unit is transmitted to the receiving end of the infrared communication device under test through the optical fiber transmission channel. The attenuation value of the programmable optical attenuation unit is adjusted to simulate the transmission loss, and quantitative analysis is performed to calculate the receiving distance.

2. The equivalent detection method for infrared communication distance as described in claim 1, characterized in that, The infrared signal acquisition unit adopts a condenser lens structure with a threaded interface. The condenser lens structure converts the divergent infrared light emitted by the infrared communication device under test into a parallel beam output. The output end of the lens and the input end of the optical fiber transmission channel are physically coupled through a threaded interface. The infrared signal is coupled to the optical fiber transmission channel through the mechanical alignment of the threaded interface.

3. The equivalent detection method for infrared communication distance as described in claim 2, characterized in that, Physical and mechanical coupling is achieved through the SMA905 threaded interface, with a repeatability accuracy of ±0.02mm; the condenser lens structure collimates the ±15° divergent light into a ±0.5° parallel beam, achieving 99% light energy collection efficiency in the 840nm band, with an insertion loss ≤0.5dB.

4. The equivalent detection method for infrared communication distance as described in claim 1, characterized in that, The optical fiber transmission channel consists of optical fibers and a programmable optical attenuation unit; The optical fiber has arbitrary bending characteristics, ensuring that the relative position of the infrared communication device under test and the infrared signal detection unit is not limited by space. The programmable optical attenuation unit is embedded in the middle of the optical fiber. By adjusting the attenuation value of the programmable optical attenuation unit, the transmission loss of infrared signals at different communication distances can be simulated.

5. The equivalent detection method for infrared communication distance as described in claim 1, characterized in that, The fixed attenuation value Pm is formed by the superposition of the inherent deviation of the infrared signal acquisition unit during the signal conversion process, the optical fiber propagation loss, and the connector loss. The optical fiber propagation loss originates from material absorption and Rayleigh scattering effect, and the connector loss originates from mechanical alignment error and interface reflection loss.

6. The equivalent detection method for infrared communication distance as described in claim 1, characterized in that, Channel 1 detects the transmission distance of the infrared communication device under test, including: The programmable optical attenuation unit is set to attenuation value of zero. The infrared communication device under test sends an infrared signal to the receiving end of the infrared signal detection unit through the optical fiber transmission channel. After verifying that the communication success rate is 100%, the attenuation value of the programmable optical attenuation unit is gradually increased in a preset step. The communication success rate is monitored in real time until the communication success rate drops below the preset threshold. The critical attenuation value P1 is recorded. The transmission distance L1 = (P1 + Pm) / a is determined based on the critical attenuation value P1 and the fixed attenuation value Pm, wherein the optical attenuation coefficient a is the correlation coefficient between the increased attenuation value and the communication distance.

7. The equivalent detection method for infrared communication distance as described in claim 1, characterized in that, Channel 2 detects the receiving distance of the infrared communication device under test, including: The programmable optical attenuation unit is set to attenuation value of zero. The transmitter of the infrared signal detection unit sends a standard test signal to the infrared communication device under test through the optical fiber transmission channel. After verifying that the communication success rate is 100%, the attenuation value of the programmable optical attenuation unit is gradually increased in a preset step. The communication success rate is monitored in real time until the communication success rate drops below the preset threshold. The critical attenuation value P2 is recorded. The receiving distance L2 = (P2 + Pm) / a is determined based on the critical attenuation value P2 and the fixed attenuation value Pm, wherein the optical attenuation coefficient a characterizes the relationship between the transmission loss and the distance.

8. The equivalent detection method for infrared communication distance as described in claim 6 or 7, characterized in that, The preset threshold for the communication success rate is 95-99%; the preset step is 0.1dB.

9. The equivalent detection method for infrared communication distance as described in claim 6 or 7, characterized in that, If the communication success rate is less than 100%, the transmission distance L1 and the reception distance L2 are determined based on the fixed attenuation value Pm; at this time, L1 = Pm / a, L2 = Pm / a.

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