fa Design and construction of visible light Instantaneous wavelength measurement تخصصی Special پژوهشي Research <span style="font-family:Calibri,sans-serif;"><span style="font-size:11.0pt;">This paper presents a method for measuring the wavelength of visible light. Many laboratory and &nbsp;industrial applications require a wavelength measurement system. Wavelength sensing devices in the visible and infrared spectrum are expensive and bulky. As a result, the use of wavelength sensors has been neglected in many applications. In this research, a practical design and construction of a wavelength measuring device with a simple electro-optical method has been investigated.</span></span> <span style="font-family:Calibri,sans-serif;"><span style="font-size:11.0pt;">Cost is much lower than the existing spectrometers, portability and continuous output are the features of this system. The system&#39;s response range is from 750 to 950 nm. Increasing wavelength spectral range is possible using a different optical filter. The key to solving the problem is the unique amount of light passing through a filter for a specific wavelength. When the signal reaches the system with a specific wavelength, as the amount of input light attenuation is a unique for each wavelength, the wavelength (frequency) of the received signal can be determined by the amount of light attenuation in comparison to reference light. Then the wavelength can be declared by a processor. Depending on the measured wavelength, color detection can be done based on the wavelength. </span></span> <strong>This paper presents a method for measuring the wavelength of visible light. Many laboratory and &nbsp;industrial applications require a wavelength measurement system. Wavelength sensing devices in the visible and infrared spectrum are expensive and bulky. As a result, the use of wavelength sensors has been neglected in many applications. In this research, a practical design and construction of a wavelength measuring device with a simple electro-optical method has been investigated. Cost is much lower than the existing spectrometers, portability and continuous output are the features of this system. The system&#39;s response range is from 750 to 950 nm. Increasing wavelength spectral range is possible using a different optical filter. The key to solving the problem is the unique amount of light passing through a filter for a specific wavelength. When the signal reaches the system with a specific wavelength, as the amount of input light attenuation is a unique for each wavelength, the wavelength (frequency) of the received signal can be determined by the amount of light attenuation in comparison to reference light. Then the wavelength can be declared by a processor. Depending on the measured wavelength, color detection can be done based on the wavelength.</strong> Instantaneous frequency measurement, Wavelength measurement, Frequency measurement, Spectrometry Instantaneous frequency measurement, Wavelength measurement, Frequency measurement, Spectrometry 34 36 http://opsi.ir/browse.php?a_code=A-10-1972-13&slc_lang=fa&sid=1 Ali Tamimi Ali Tamimi 10031947532846009991 10031947532846009991 Yes Faculty of EE, Imam Hossein University, Tehran, Iran Faculty of EE, Imam Hossein University, Tehran, Iran Mohammdhossein Ghezelayagh Mohammdhossein Ghezelayagh 10031947532846009992 10031947532846009992 No Faculty of EE, Imam Hossein University, Tehran, Iran Faculty of EE, Imam Hossein University, Tehran, Iran Abbas Bashiri Abbas Bashiri 10031947532846009993 10031947532846009993 No Faculty of EE, Imam Hossein University, Tehran, Iran Faculty of EE, Imam Hossein University, Tehran, Iran