An optical measurement device, comprising: a light source; an emission optic configured to direct a first portion of light generated by the light source to a measurement target; a collection optic configured to receive measurement light from the measurement target; an optical conduit configured to direct a second portion of light generated by the light source to a spectral reference; the spectral reference; a sensor; and an optical filter, wherein: a first portion of the optical filter is provided between the collection optic and a first portion of the sensor, wherein the first portion of the optical filter is configured to receive the measurement light from the collection optic and pass one or more wavelengths of the measurement light to the first portion of the sensor; and a second portion of the optical filter is provided between the spectral reference and a second portion of the sensor, wherein the second portion of the optical filter is configured to receive reference light from the spectral reference and pass one or more wavelengths of the reference light to the second portion of the sensor; wherein the first portion of the optical filter and the second portion of the optical filter are separated by a blocking component, the blocking component being configured to prevent the reference light from transmitting to the first sensor portion via the second optical filter portion and/or the second sensor portion; and/or to prevent the measurement light from transmitting to the second sensor portion via the first optical filter portion and/or the first sensor portion. a light source; an emission optic configured to direct a first portion of light generated by the light source to a measurement target; a collection optic configured to receive measurement light from the measurement target; an optical conduit configured to direct a second portion of light generated by the light source to a spectral reference; the spectral reference; a sensor; and an optical filter, wherein: a first portion of the optical filter is provided between the collection optic and a first portion of the sensor, wherein the first portion of the optical filter is configured to receive the measurement light from the collection optic and pass one or more wavelengths of the measurement light to the first portion of the sensor; and a second portion of the optical filter is provided between the spectral reference and a second portion of the sensor, wherein the second portion of the optical filter is configured to receive reference light from the spectral reference and pass one or more wavelengths of the reference light to the second portion of the sensor; wherein the first portion of the optical filter and the second portion of the optical filter are separated by a blocking component, the blocking component being configured to prevent the reference light from transmitting to the first sensor portion via the second optical filter portion and/or the second sensor portion; and/or to prevent the measurement light from transmitting to the second sensor portion via the first optical filter portion and/or the first sensor portion. a first portion of the optical filter is provided between the collection optic and a first portion of the sensor, wherein the first portion of the optical filter is configured to receive the measurement light from the collection optic and pass one or more wavelengths of the measurement light to the first portion of the sensor; and a second portion of the optical filter is provided between the spectral reference and a second portion of the sensor, wherein the second portion of the optical filter is configured to receive reference light from the spectral reference and pass one or more wavelengths of the reference light to the second portion of the sensor; wherein the first portion of the optical filter and the second portion of the optical filter are separated by a blocking component, the blocking component being configured to prevent the reference light from transmitting to the first sensor portion via the second optical filter portion and/or the second sensor portion; and/or to prevent the measurement light from transmitting to the second sensor portion via the first optical filter portion and/or the first sensor portion.