Proving that you are being harassed with low-frequency infrasound can be challenging, as it is a subjective experience and may not be easily detectable or measurable. However, here are a few steps you can take to gather evidence and determine if low-frequency infrasound is indeed present:
Document your experiences: Keep a detailed log of the incidents, including the date, time, duration, and description of the sensations or noises you perceive. Note any patterns or correlations between the occurrences and your neighbor's activities.
Seek medical evaluation: Consult a medical professional, such as an otolaryngologist or audiologist, to rule out any underlying medical conditions that could be causing the sensations you are experiencing. They can conduct hearing tests and assess your symptoms objectively.
Conduct a sound measurement: Although infrasound is typically below the audible range of human hearing (below 20 Hz), specialized equipment can detect and measure it. Contact an acoustics professional or hire an acoustics consultant who can perform measurements in your home or vicinity to determine if there are indeed infrasound signals present.
Install a sound recording device: Place a high-quality sound recording device in your home to capture any unusual sounds or frequencies that you suspect are infrasound. Make sure the recorder is capable of recording low-frequency sounds. The recorded evidence can be useful in supporting your claims.
Contact local authorities: If you have substantial evidence and genuinely believe you are being harassed, report the issue to your local law enforcement agency. Provide them with the documented incidents, any medical evaluations, and sound recordings you have gathered. They can investigate the matter further and take appropriate action if necessary.
Remember that infrasound is relatively rare as a method of harassment, and there may be alternative explanations for the sensations you are experiencing. It's important to approach the situation with an open mind and consider all possibilities before drawing conclusions. Seeking professional assistance and involving local authorities can help you address the issue effectively and gather the necessary evidence.