Phototransistor amplifier
Actually, that is not a TIA. It's a fairly simple AC amplifier with a gain of about 45 (100k / 2.2k).

I presume the emitter of Q1 is tied to ground. Then the voltage at the collector will be 10k times the current in amps. DC levels (or at least, fairly low frequencies) will be blocked by C8. For frequencies above that set by R7/C8, and below that set by R6/C9, the gain of the amp will be the aforementioned 45.

This will be complicated by the fact that R7 is only about 1/4 R6. This means that for a given current variation in Q1, the effective value of R6 will be about 1/4 of what you'd expect, since R7 will tend to shunt away most of the current. So the effective gain will be more along the lines of 11 or 12, rather than 45.