3897
An in-situ monitoring system ( IMS ) based on optical imaging was developed in-house for implementation on the selective laser melting process .
 in-situ, optical, imaging, selective laser melting process
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 in-situ, optical, imaging, selective laser melting process