The resolution of an infrared spectrometer is affected by several factors, which include, but are not limited to, the following:
Instrument design: The optical path design of the infrared spectrometer, the spectroscopic system, and the performance of the detector will all affect its resolution. For example, the quality of the optical system, the purity of the optical path, the type and quality of the detector, etc., all directly affect the resolution.
The quality of the light source: The quality of the light source used in an infrared spectrometer has a significant impact on resolution. If the quality of the light source is not good, the resulting spectrum may have a lot of noise, which will reduce the resolution. Infrared lasers are the preferred light source for high-resolution spectra due to their high intensity and narrow spectral lines. 
The condition and preparation of the sample: The physical state of the sample (e.g., solid, liquid, or gaseous) and the way the sample is prepared (e.g., film, powder, or solution) can affect the measurement results of the infrared spectrum, which in turn affects the resolution.
Environmental conditions: The environment in which the infrared spectrometer is used, such as temperature, humidity, and vibration, can have an impact on the resolution. For example, changes in temperature and humidity in the sample chamber may affect the physical properties of the sample and thus its absorption spectrum.
Operation and maintenance: The skill level of the operator, the routine maintenance and calibration of the instrument can also have an impact on the resolution. Incorrect operation or neglected maintenance can lead to degraded instrument performance, which in turn can affect resolution. 
Therefore, in order to obtain high-quality infrared spectroscopy data, it is necessary to pay attention to the influence of the above factors and take corresponding measures to optimize the experimental conditions, improve the resolution of the instrument and the accuracy of the measurement results.