Question

which part of the neuron converts information from olfactory receptor into an impulse

Answer 1

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Sensory neuron converts information from olfactory receptor into an impulse.
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Answer 2

Sensory neurons also known as afferent neurons are neurons that convert a specific type of stimulus, via their receptors, into action potentials or graded potentials.[citation needed] This process is called sensory transduction. The cell bodies of the sensory neurons are located in the dorsal ganglia of the spinal cord.[1]

This sensory information travels along afferent nerve fibers in an afferent or sensory nerve, to the brain via the spinal cord. The stimulus can come from extoreceptors outside the body, for example light and sound, or from interoreceptors inside the body, for example blood pressure or the sense of body position.

Different types of sensory neurons have different sensory receptors that respond to different kinds of stimuli.