Optical spectrometer

A method for calibrating an optical spectrometer that includes an input module, an optical sensing device, and a light splitter disposed between the input module and the optical sensing device,

• the input module including an orifice through which an incident light beam passes, the orifice having a width in a first direction and a length in a second direction far greater than the width,
• the optical sensing device including a two-dimensional array of sensing cells arranged into a plurality of rows and columns, each of the sensing cells being capable of generating an electrical signal corresponding to light sensed thereby,
• the light splitter receiving the incident light beam from the input module, splitting the incident light beam into at least one wavelength component of a light band, and projecting said at least one wavelength component to the optical sensing device,
• said method comprising the steps of:
• a) disposing the optical sensing device relative to the input module and the light splitter such that said at least one wavelength component to be projected thereon is inclined at an angle of inclination relative to a columnar direction of the sensing cells;
• b) using a standard light beam as the incident light beam such that said at least one wavelength component projected to the optical sensing device is that of a standard light band;
• c) processing the electrical signals generated by the sensing cells upon use of the standard light beam so as to determine a twist parameter associated with the angle of inclination;
• and
• d) recording the twist parameter.

A method for optical spectroscopy to be implemented using an optical spectrometer that includes an input module, an optical sensing device, and a light splitter disposed between the input module and the optical sensing device,

• the input module including an orifice through which an incident light beam passes, the orifice having a width in a first direction and a length in a second direction far greater than the width,
• the optical sensing device including a two-dimensional array of sensing cells arranged into a plurality of rows and columns, each of the sensing cells being capable of generating an electrical signal corresponding to light sensed thereby,
• the light splitter receiving the incident light beam from the input module, splitting the incident light beam into at least one wavelength component of a light band, and projecting said at least one wavelength component to the optical sensing device,
• the optical sensing device being disposed relative to the input module and the light splitter such that said at least one wavelength component projected thereon is inclined at a predetermined angle relative to a columnar direction of the sensing cells,
• said method comprising the steps of:
• a) assigning an incrementing order of distinct wavelengths to coordinates of a lowermost row of the sensing cells in the two-dimensional array;
• b) assigning individual wavelengths to coordinates of other ones of the sensing cells in the two-dimensional array based on the wavelength assigned to an aligned one of the sensing cells on the lowermost row, a unit distance from the lowermost row, a wavelength increment between two adjacent ones of the sensing cells on the lowermost row, and a twist parameter associated with the predetermined angle;
• and
• c) determining the wavelength of said at least one wavelength component from an intersection point of said at least one wavelength component with a column boundary of the sensing cells in the two-dimensional array.