Infrared jammers are usually used to interfere with infrared type sensors, cutting off the infrared signal between the target and the sensor, thereby interfering with the work of the sensor. To know whether the infrared jammer is effective, you can perform the following test: 1. First, determine the working principle of the infrared sensor you want to test, and understand how it responds to infrared interference. Different types of infrared sensors respond to infrared interference in different ways. For example, some sensors will only sound an alarm after a period of interference occurs, while others will sound an alarm immediately. 2. Place the infrared jammer within the working range of the infrared sensor to be tested and observe the sensor's response. If the sensor does not respond, the interference is valid. 3. If the sensor reacts and sounds an alarm, you need to adjust the position of the infrared jammer or adjust its interference intensity until the sensor stops reacting. This ensures that the jammer's interference with the sensor is effective and does not affect other normally working equipment. It is important to note that any testing using jammer equipment requires caution. Safety for surrounding equipment and personnel needs to be ensured during testing, and permission to test the equipment needs to be obtained before testing can be conducted.