A flexible pressure sensor frequency response test mechanism
By using a testing mechanism consisting of a vibrator, a gravity sensor, and weights, a high-frequency vibration environment is simulated, which solves the problem of frequency response testing of flexible pressure sensors under high-frequency mechanical vibration, and improves the testing accuracy and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN PRIMAX ELECTRONIC & TEKLECOM PROD LTD
- Filing Date
- 2025-05-07
- Publication Date
- 2026-06-23
AI Technical Summary
Existing flexible pressure sensors are difficult to accurately assess frequency response under high-frequency mechanical vibration or instantaneous impact, resulting in measurement distortion and insufficient reliability.
The testing mechanism consists of a vibrator, a gravity sensor, and weights. By having the weights contact a flexible pressure sensor, a high-frequency vibration environment is simulated. The gravity sensor collects data synchronously, enabling signal calibration, dynamic tuning, and scenario simulation, thereby improving testing accuracy.
This improves the frequency response testing accuracy and versatility of flexible pressure sensors, ensuring reliability and accuracy under complex working conditions.
Smart Images
Figure CN224398877U_ABST
Abstract
Description
Technical fields:
[0001] This utility model relates to the field of sensor testing technology, and specifically to a frequency response testing mechanism for a flexible pressure sensor. Background technology:
[0002] Flexible pressure sensors are flexible, highly sensitive sensing devices made of flexible materials (such as conductive polymers, nanocomposite materials, or liquid metals). They can conform to complex surfaces and detect dynamic pressure changes in real time. They are widely used in medical and health monitoring (such as pulse and respiratory signals), robot tactile sensing, and industrial vibration detection.
[0003] Chinese utility model patent CN 210774448 U discloses a flexible pressure sensor, comprising a flexible substrate on which a pressure sensor array is disposed. The pressure sensor array includes multiple pressure sensing chips evenly distributed on the substrate. The substrate also has a row electrode array and a column electrode array. The row electrode array includes row electrodes corresponding to each pressure sensing chip, and the column electrode array includes column electrodes corresponding to each pressure sensing chip. Each pressure sensing chip is connected to one row electrode and one column electrode. The sensor also includes a flexible covering layer encapsulating the substrate, pressure sensing chips, row electrode array, and column electrode array. This flexible pressure sensor array can test pressure changes on a surface or along a line, and can acquire pressure distribution along blood flow or within a local area, thereby obtaining more pulse testing information. In addition to pulse rate, it can also acquire blood flow information, providing more testing information for cardiovascular diseases, etc.
[0004] As the application scenarios of flexible pressure sensors place increasingly stringent requirements on dynamic signal capture, frequency response tests are often required to evaluate the sensor's response capability under rapidly changing dynamic pressure. For example, when detecting high-frequency mechanical vibration (>100Hz) or instantaneous impact, it is necessary to ensure that the amplitude attenuation and phase delay of its output signal are within the allowable range of the actual pressure change, so as to avoid measurement distortion due to insufficient bandwidth or response lag, thereby ensuring its reliability and accuracy under complex working conditions.
[0005] In view of the above, the inventors propose the following technical solution. Utility model content:
[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a flexible pressure sensor frequency response testing mechanism.
[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a flexible pressure sensor frequency response testing mechanism, comprising: a vibrator, a gravity sensor and a weight, wherein the gravity sensor and the weight are respectively in contact with both sides of the vibrator, one end of the weight is mounted on a bracket through a linear bearing, and the other end of the weight is used to contact and press against the flexible pressure sensor.
[0008] Furthermore, in the above technical solution, a transmission block is provided between the weight and the vibrator. One end of the transmission block extends into the vibrator, and one end of the weight passes through a linear bearing and extends into the other end of the transmission block.
[0009] Furthermore, in the above technical solution, the other end of the weight is provided with a contact block that contacts the flexible pressure sensor.
[0010] After adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art: In this utility model, a vibrator is used to simulate the high-frequency vibration environment of the flexible pressure sensor. Data from the vibrator is simultaneously received by a gravity sensor, and the data collected by the flexible pressure sensor is compared with the data collected by the gravity sensor to determine whether the frequency response of the flexible pressure sensor meets the requirements. Secondly, weights are used to transmit the vibration signal between the vibrator and the flexible pressure sensor, realizing calibration benchmark, dynamic tuning, signal optimization, and scene simulation functions, thereby improving the accuracy and versatility of the frequency response test of the flexible pressure sensor. Attached image description:
[0011] Figure 1 This is a schematic diagram of the structure of this utility model;
[0012] Figure 2 This is a cross-sectional view of the present invention;
[0013] Figure 3 This is an exploded view of the present invention. Detailed implementation method:
[0014] The present invention will be further described below with reference to specific embodiments and accompanying drawings.
[0015] See Figures 1 to 3As shown, a frequency response testing mechanism for a flexible pressure sensor includes a vibrator 1, a gravity sensor 2, and a weight 3. The gravity sensor 2 and the weight 3 are in contact with opposite sides of the vibrator 1. One end of the weight 3 is mounted on a bracket 5 via a linear bearing 4, and the other end of the weight 3 is used to contact and press against the flexible pressure sensor 6. The vibrator 1 simulates the high-frequency vibration environment of the flexible pressure sensor 6. Data from the vibrator 1 is received synchronously by the gravity sensor 2. The data collected by the flexible pressure sensor 6 is compared with the data collected by the gravity sensor 2 to determine whether the frequency response of the flexible pressure sensor 6 meets the requirements. Furthermore, the weight 3 transmits the vibration signal between the vibrator 1 and the flexible pressure sensor 6, enabling calibration, dynamic tuning, signal optimization, and scenario simulation functions, thereby improving the accuracy and versatility of the frequency response test for the flexible pressure sensor 6.
[0016] A transmission block 7 is provided between the weight 3 and the vibrator 1. One end of the transmission block 7 extends into the vibrator 1, and one end of the weight 3 passes through the linear bearing 4 and extends into the other end of the transmission block 7. The other end of the weight 3 is provided with a contact block 8 that contacts the flexible pressure sensor 6.
[0017] In this embodiment, the weight 3 serves the following purposes:
[0018] 1. Provide standard load to calibrate sensor sensitivity: Weight 3, as an object of known mass, generates precise static or dynamic pressure through the formula F = m·a, which is used to calibrate the resistance-pressure conversion relationship of flexible pressure sensor 6, ensuring the accuracy and repeatability of test data;
[0019] 2. Adjusting system dynamic characteristics and optimizing test conditions: Weight 3 can change the equivalent mass of the vibration system, avoiding signal distortion in the high-frequency band caused by the sensor's own resonance. For example, the mass of weight 3 should be controlled to be less than 1 / 10 of the mass of the substance being measured, in order to expand the effective frequency range of the sensor;
[0020] 3. Isolate interference and improve signal transmission efficiency: As a mechanical load, the weight 3 can reduce the loss of vibration energy during transmission, ensure that the excitation signal of the vibrator is efficiently transmitted to the flexible pressure sensor 6, and reduce the impact of environmental noise on data acquisition.
[0021] 4. Simulate actual working conditions to verify sensor reliability: Use weights of different masses 3 to simulate actual application scenarios and verify the performance of flexible pressure sensor 6 under complex dynamic pressure.
[0022] In summary, during operation, this invention generates a sinusoidal signal via a signal generator as an adjustable frequency excitation source. This signal is amplified by a power amplifier and then drives the vibrator 1 to form a controllable dynamic force input (adjustable frequency and amplitude) to simulate an actual dynamic pressure scenario. Furthermore, the acceleration signal generated by the vibrator 1 is measured by the gravity sensor 2 and recorded by a data acquisition card. The actual applied force is then calculated using the formula: F = m·a. Further, the flexible pressure sensor 6 converts the resistance change into an analog voltage signal via a transmitter (including signal conditioning circuitry such as a Wheatstone bridge and amplification / filtering module), which is then synchronously acquired by the data acquisition card. Furthermore, by comparing the synchronously acquired force input signal from the gravity sensor 2 with the output response signal from the flexible pressure sensor 6, time-domain cross-correlation analysis or frequency-domain FFT phase angle comparison is used to calculate the phase difference (Δφ) between the two signals, thus obtaining the time delay characteristics of the dynamic response of the flexible pressure sensor 6. Finally, the acceleration signal is converted into an input force (F…). in ), and the output signal (V) of the flexible pressure sensor 6. out By comparing the amplitudes, we obtain the amplitude-frequency characteristic gain: |H(f)|=V out / F in |, plotted as an amplitude-frequency curve; further, dynamic loading verification: the sinusoidal force applied by vibrator 1 needs to cover the sensor's operating frequency band (e.g., 0.1–500Hz), and the amplitude attenuation and phase shift of the flexible pressure sensor 6 are verified by changing the frequency to see if they meet the design expectations. Simultaneously, during the above testing process, the data acquisition card needs to have a high sampling rate (at least 10 times the highest test frequency) and synchronous triggering function to avoid phase errors caused by time base deviation. Moreover, to ensure testing accuracy, the following optimizations are required:
[0023] 1. Force-to-electric conversion calibration: The equivalent mass (mm) of the vibrator needs to be pre-calibrated to ensure F in Accurate calculation;
[0024] 2. Nonlinear compensation: If the response of the flexible pressure sensor 6 is nonlinear (e.g., a sensitivity difference of 0.1–10 kPa), a correction algorithm needs to be introduced in the data processing.
[0025] 3. Environmental interference suppression: High-frequency noise and low-frequency drift are eliminated by bandpass filtering (e.g., 20–500Hz), thereby improving the signal-to-noise ratio (SNR>60dB[^2][^5]).
[0026] Of course, the above description is only a specific embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model should be included in the scope of the claims of the present utility model.
Claims
1. A flexible pressure sensor frequency response test mechanism, characterized by, It includes: Vibrator (1), gravity sensor (2) and weight (3), wherein the gravity sensor (2) and the weight (3) are respectively in contact with the two sides of the vibrator (1), one end of the weight (3) is installed on the support (5) through the linear bearing (4), and the other end of the weight (3) is used for being in contact with the flexible pressure sensor (6).
2. The flexible pressure sensor frequency response testing mechanism of claim 1, wherein: The transmission block (7) is arranged between the weight (3) and the vibrator (1) and connected, one end of the transmission block (7) extends into the vibrator (1), and one end of the weight (3) extends into the other end of the transmission block (7) through the linear bearing (4).
3. The flexible pressure sensor frequency response testing mechanism of claim 1, wherein: The other end of the weight (3) is provided with a contact block (8) in contact with the flexible pressure sensor (6).